diff --git a/.cspell/words.txt b/.cspell/words.txt
index 559d6355..6526e3bf 100644
--- a/.cspell/words.txt
+++ b/.cspell/words.txt
@@ -1,12 +1,22 @@
+anthropic
+anyhow
 clippy
 codex
+creds
+deserialize
 dtolnay
 hakula
 impls
 indoc
 println
+RAII
 ratatui
+reqwest
+rustls
 serde
+strum
 swatinem
+thiserror
 tokio
 tracing
+venv
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index d8b1346e..4a2f7b65 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -1,14 +1,19 @@
+<!-- markdownlint-disable-next-line first-line-heading -->
 ## Summary
 
-<!-- One bullet per logical change. Group by: features, refactors, tests, docs. -->
+<!-- Prose intro: what this PR does and why, in 1-3 sentences. -->
+
+<!-- Then one bullet per logical change. -->
 
 -
 
-## Follow-ups
+## Changes
 
-<!-- Items deferred from this PR. Remove section if none. -->
+<!-- Per-file breakdown. Remove for trivial PRs. -->
 
--
+| File | Description |
+| ---- | ----------- |
+|      |             |
 
 ## Test plan
 
diff --git a/.gitignore b/.gitignore
index d21a6ccc..9185d64c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 # Build output
 /target/
 
+# Python
+/.venv/
+
 # OS files
 .DS_Store
 
diff --git a/.markdownlint.json b/.markdownlint.json
new file mode 100644
index 00000000..a8a7d2b8
--- /dev/null
+++ b/.markdownlint.json
@@ -0,0 +1,5 @@
+{
+  "line-length": false,
+  "no-duplicate-heading": { "siblings_only": true },
+  "no-inline-html": false
+}
diff --git a/.python-version b/.python-version
new file mode 100644
index 00000000..24ee5b1b
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.13
diff --git a/CLAUDE.md b/CLAUDE.md
index 1b33526c..67024dd2 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -2,12 +2,12 @@
 
 ## Project Overview
 
-oxide-code is a terminal-based AI coding assistant written in Rust, inspired by [Claude Code](https://docs.anthropic.com/en/docs/claude-code). It communicates with LLM APIs to help developers with software engineering tasks directly from the terminal.
+oxide-code is a terminal-based AI coding assistant written in Rust, inspired by [Claude Code](http://code.claude.com/docs). It communicates with LLM APIs to help developers with software engineering tasks directly from the terminal.
 
 ### CLI
 
 ```bash
-oxide-code              # Start an interactive session
+ox                      # Start an interactive session
 ```
 
 ### Project Layout
@@ -22,7 +22,14 @@ oxide-code              # Start an interactive session
 
 ```text
 .
-└── main.rs             # CLI entry point
+├── client.rs           # Client module root
+├── client/
+│   └── anthropic.rs    # Anthropic Messages API streaming client
+├── config.rs           # Configuration loading (env vars, model, base URL)
+├── config/
+│   └── oauth.rs        # Claude Code OAuth credentials, token refresh, file locking
+├── main.rs             # CLI entry point, async REPL
+└── message.rs          # Conversation message types
 ```
 
 ## Coding Conventions
@@ -31,18 +38,35 @@ oxide-code              # Start an interactive session
 
 - Application code: `anyhow::Result` with `.context()` for actionable messages.
 - Library error types: `thiserror::Error` derive for errors that callers need to match on.
+- Avoid `unwrap()` / `expect()` in production code. Reserve them for cases with a clear invariant comment.
 
 ### Lint Suppression
 
 - Use `#[expect(lint)]` instead of `#[allow(lint)]`. `#[expect]` warns when the suppressed lint is no longer triggered, preventing stale suppressions from accumulating.
+- `#[expect]` reason strings must describe the current state, not future plans.
+
+### Section Dividers
+
+- Use `// ── Section Name ──` for section dividers in code (box-drawing character `─`, U+2500).
+- In tests, use `// ── function_name ──` as section headers grouping tests by the function they cover.
 
 ### Module Organization
 
 - New-style module paths: `foo.rs` alongside `foo/` directory, not `foo/mod.rs`.
 - Keep files focused: one primary type or concern per file.
 - Place functions and types in the module that reflects their conceptual domain — import paths should not mislead about what the item does. Create new modules when needed for clean organization.
-- Avoid deep `pub use` re-export chains that obscure where items are defined.
-- Order helper functions by their caller.
+- Avoid `pub use` re-exports that obscure where items are defined. Prefer consistent import paths — if some items are re-exported, re-export all related items so callers never mix paths.
+- Order helper functions after their caller (top-down reading order).
+
+### Visibility
+
+- Default to the smallest visibility needed: private → `pub(crate)` → `pub`.
+- `pub` items form the crate's API surface. Use `pub(crate)` for items shared across modules but not intended for external use.
+
+### Imports
+
+- Group `use` statements in three blocks separated by blank lines: std → external crates → internal modules.
+- Within each block, sort alphabetically.
 
 ### String Literals
 
@@ -61,21 +85,33 @@ oxide-code              # Start an interactive session
 
 ### Git Conventions
 
-- Commit messages: `type(scope): description`
+#### Commits
+
+- Messages: `type(scope): description`
   - Types: `feat`, `fix`, `refactor`, `docs`, `test`, `chore`, `style`, `perf`
-  - Scope: crate or module name (e.g., `oxide-code`, `cli`, `agent`)
-- Feature branches: `feat/<feature-name>`
+  - Scope: the most specific area changed — module (e.g., `client`, `config`, `oauth`), doc target (e.g., `CLAUDE`, `research`), or crate name only for cross-module changes.
 - Keep commits atomic — one logical change per commit.
-- PRs: assign to `hakula139`, label `enhancement` for `feat`, `bug` for `fix`. Do not request review from the PR author (GitHub rejects it).
+
+#### Branches
+
+- Feature branches: `feat/<feature-name>`
+
+#### Pull Requests
+
+- Assign to `hakula139`. Label `enhancement` for `feat`, `bug` for `fix`.
+- Do not request review from the PR author (GitHub rejects it).
+- Descriptions follow `.github/pull_request_template.md`:
+  - Prose intro summarizing what and why.
+  - Per-file Changes table (for non-trivial PRs).
+  - Test plan checklist.
 
 ### Testing
 
 - Unit tests in the same file as the code they test (`#[cfg(test)]` module).
 - Integration tests in `tests/` directory for cross-module behavior.
-- Group tests by function under `// -- function_name --` section headers. Section order must mirror the production function order in the same file. Within each section, order: happy path → variants → error cases.
-- Test name prefixes should match the section's function name (or a clear shortening).
-- Error-case test names use a return-type suffix: `_returns_error` (`Result`), `_returns_none` (`Option`), `_returns_false` (`bool`).
-- Use `indoc!` for multi-line test inputs whenever possible.
+- Group tests by function under `// ── function_name ──` section headers. Section order must mirror the production function order in the same file. Within each section, order: happy path → variants → edge / error cases.
+- Name tests after the scenario they cover, not the return type. Prefix with the function name being tested (e.g., `parse_sse_frame_missing_data`, `load_oauth_expired_token`).
+- Use `indoc!` for multi-line string literals in tests.
 
 ### Documentation Maintenance
 
@@ -96,7 +132,7 @@ cargo llvm-cov --ignore-filename-regex 'main\.rs'  # check test coverage
 
 ## Code Review
 
-After verification passes, run a dual review using both a reviewer subagent and a Codex MCP reviewer in parallel. Focus on:
+After verification passes, review for:
 
 - Correctness and edge cases
 - Adherence to project conventions (this file)
diff --git a/Cargo.lock b/Cargo.lock
index ecc9d039..bd26ca3f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddd31a130427c27518df266943a5308ed92d4b226cc639f5a8f1002816174301"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anstream"
 version = "1.0.0"
@@ -38,7 +47,7 @@ version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -49,9 +58,67 @@ checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
 dependencies = [
  "anstyle",
  "once_cell_polyfill",
- "windows-sys",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.102"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
+
+[[package]]
+name = "atomic-waker"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
+
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
+[[package]]
+name = "bitflags"
+version = "2.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843867be96c8daad0d758b57df9392b6d8d271134fce549de6ce169ff98a92af"
+
+[[package]]
+name = "bumpalo"
+version = "3.20.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d20789868f4b01b2f2caec9f5c4e0213b41e3e5702a50157d699ae31ced2fcb"
+
+[[package]]
+name = "bytes"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
+
+[[package]]
+name = "cc"
+version = "1.2.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1e928d4b69e3077709075a938a05ffbedfa53a84c8f766efbf8220bb1ff60e1"
+dependencies = [
+ "find-msvc-tools",
+ "shlex",
 ]
 
+[[package]]
+name = "cfg-if"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
+
+[[package]]
+name = "cfg_aliases"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
+
 [[package]]
 name = "clap"
 version = "4.6.0"
@@ -99,88 +166,1644 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
 
 [[package]]
-name = "heck"
+name = "dirs"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3e8aa94d75141228480295a7d0e7feb620b1a5ad9f12bc40be62411e38cce4e"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
+name = "dirs-sys"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+checksum = "e01a3366d27ee9890022452ee61b2b63a67e6f13f58900b651ff5665f0bb1fab"
+dependencies = [
+ "libc",
+ "option-ext",
+ "redox_users",
+ "windows-sys 0.61.2",
+]
 
 [[package]]
-name = "is_terminal_polyfill"
-version = "1.70.2"
+name = "displaydoc"
+version = "0.2.5"
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-checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
+checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
 
 [[package]]
-name = "once_cell_polyfill"
-version = "1.70.2"
+name = "errno"
+version = "0.3.14"
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-checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
+checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
+dependencies = [
+ "libc",
+ "windows-sys 0.61.2",
+]
 
 [[package]]
-name = "oxide-code"
-version = "0.1.0"
+name = "fastrand"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
+
+[[package]]
+name = "find-msvc-tools"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
+
+[[package]]
+name = "form_urlencoded"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb4cb245038516f5f85277875cdaa4f7d2c9a0fa0468de06ed190163b1581fcf"
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- "clap",
+ "percent-encoding",
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-name = "proc-macro2"
-version = "1.0.106"
+name = "futures"
+version = "0.3.32"
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-checksum = "8fd00f0bb2e90d81d1044c2b32617f68fcb9fa3bb7640c23e9c748e53fb30934"
+checksum = "8b147ee9d1f6d097cef9ce628cd2ee62288d963e16fb287bd9286455b241382d"
 dependencies = [
- "unicode-ident",
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
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-version = "1.0.45"
+name = "futures-channel"
+version = "0.3.32"
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+checksum = "07bbe89c50d7a535e539b8c17bc0b49bdb77747034daa8087407d655f3f7cc1d"
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- "proc-macro2",
+ "futures-core",
+ "futures-sink",
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-version = "0.11.1"
+name = "futures-core"
+version = "0.3.32"
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+checksum = "7e3450815272ef58cec6d564423f6e755e25379b217b0bc688e295ba24df6b1d"
 
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-name = "syn"
-version = "2.0.117"
+name = "futures-executor"
+version = "0.3.32"
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+checksum = "baf29c38818342a3b26b5b923639e7b1f4a61fc5e76102d4b1981c6dc7a7579d"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
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+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cecba35d7ad927e23624b22ad55235f2239cfa44fd10428eecbeba6d6a717718"
+
+[[package]]
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- "unicode-ident",
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+name = "futures-sink"
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+checksum = "389ca41296e6190b48053de0321d02a77f32f8a5d2461dd38762c0593805c6d6"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-macro",
+ "futures-sink",
+ "futures-task",
+ "memchr",
+ "pin-project-lite",
+ "slab",
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+checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
 dependencies = [
- "windows-link",
+ "cfg-if",
+ "js-sys",
+ "libc",
+ "wasi",
+ "wasm-bindgen",
+]
+
+[[package]]
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+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
+dependencies = [
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+ "js-sys",
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+ "httparse",
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+ "hyper",
+ "hyper-util",
+ "rustls",
+ "rustls-pki-types",
+ "tokio",
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+ "webpki-roots",
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+
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+
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+
+[[package]]
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+
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+
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+
+[[package]]
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+checksum = "72d6e5c6afb84d73944e5cedb052c4680d5657337201555f9f2a16b7406d4954"
+dependencies = [
+ "stable_deref_trait",
+ "yoke-derive",
+ "zerofrom",
+]
+
+[[package]]
+name = "yoke-derive"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
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+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.48"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
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+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
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+
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+checksum = "2a59c17a5562d507e4b54960e8569ebee33bee890c70aa3fe7b97e85a9fd7851"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
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+version = "0.11.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c28719294829477f525be0186d13efa9a3c602f7ec202ca9e353d310fb9a002"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
index 599772ad..0b56f091 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,33 @@ unsafe_code = "forbid"
 pedantic = { level = "warn", priority = -1 }
 
 [workspace.dependencies]
+anyhow = "1"
 clap = { version = "4", features = ["derive"] }
+dirs = "6"
+futures = "0.3"
+indoc = "2"
+reqwest = { version = "0.12", default-features = false, features = [
+  "json",
+  "rustls-tls",
+  "stream",
+] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tempfile = "3"
+tokio = { version = "1", features = [
+  "rt-multi-thread",
+  "io-std",
+  "io-util",
+  "macros",
+  "signal",
+  "sync",
+] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", default-features = false, features = [
+  "fmt",
+  "env-filter",
+  "ansi",
+] }
 
 [profile.release]
 lto = true
diff --git a/README.md b/README.md
index ede2b7bf..6567b99a 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Early development. See [`docs/roadmap.md`](docs/roadmap.md) for the current road
 ## Usage
 
 ```bash
-oxide-code
+ox
 ```
 
 ## Building from Source
@@ -27,7 +27,7 @@ Requires [Rust](https://www.rust-lang.org/tools/install) 1.85+ (edition 2024).
 cargo build --release
 ```
 
-The binary will be at `target/release/oxide-code`.
+The binary will be at `target/release/ox`.
 
 ## Development
 
diff --git a/crates/oxide-code/Cargo.toml b/crates/oxide-code/Cargo.toml
index 7d589478..eb7c0ef8 100644
--- a/crates/oxide-code/Cargo.toml
+++ b/crates/oxide-code/Cargo.toml
@@ -5,8 +5,25 @@ edition.workspace = true
 authors.workspace = true
 license.workspace = true
 
+[[bin]]
+name = "ox"
+path = "src/main.rs"
+
 [lints]
 workspace = true
 
 [dependencies]
+anyhow.workspace = true
 clap.workspace = true
+dirs.workspace = true
+futures.workspace = true
+reqwest.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+tokio.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+
+[dev-dependencies]
+indoc.workspace = true
+tempfile.workspace = true
diff --git a/crates/oxide-code/src/client.rs b/crates/oxide-code/src/client.rs
new file mode 100644
index 00000000..e5299972
--- /dev/null
+++ b/crates/oxide-code/src/client.rs
@@ -0,0 +1 @@
+pub mod anthropic;
diff --git a/crates/oxide-code/src/client/anthropic.rs b/crates/oxide-code/src/client/anthropic.rs
new file mode 100644
index 00000000..ebe8a825
--- /dev/null
+++ b/crates/oxide-code/src/client/anthropic.rs
@@ -0,0 +1,344 @@
+use anyhow::{Context, Result, bail};
+use futures::StreamExt;
+use reqwest::header::{AUTHORIZATION, CONTENT_TYPE, HeaderMap, HeaderValue};
+use serde::{Deserialize, Serialize};
+use tokio::sync::mpsc;
+
+use crate::config::{Auth, Config};
+use crate::message::Message;
+
+const API_VERSION: &str = "2023-06-01";
+const CLAUDE_CODE_BETA_HEADER: &str = "claude-code-20250219";
+const INTERLEAVED_THINKING_BETA_HEADER: &str = "interleaved-thinking-2025-05-14";
+const CONTEXT_1M_BETA_HEADER: &str = "context-1m-2025-08-07";
+const OAUTH_BETA_HEADER: &str = "oauth-2025-04-20";
+
+/// System prompt prefix that identifies the client to the Anthropic API. Required
+/// for OAuth tokens — without it, non-Haiku models return 429. Always sent
+/// regardless of auth method for simplicity.
+const SYSTEM_PROMPT_PREFIX: &str = "You are Claude Code, Anthropic's official CLI for Claude.";
+
+// ── Request types ──
+
+#[derive(Serialize)]
+struct CreateMessageRequest<'a> {
+    model: &'a str,
+    max_tokens: u32,
+    messages: &'a [Message],
+    system: &'a str,
+    stream: bool,
+}
+
+// ── SSE response types ──
+
+#[expect(
+    dead_code,
+    reason = "fields are populated by serde and used in downstream matching"
+)]
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum StreamEvent {
+    MessageStart {
+        message: MessageResponse,
+    },
+    ContentBlockStart {
+        index: usize,
+        content_block: ContentBlockInfo,
+    },
+    ContentBlockDelta {
+        index: usize,
+        delta: Delta,
+    },
+    ContentBlockStop {
+        index: usize,
+    },
+    MessageDelta {
+        delta: MessageDeltaBody,
+        usage: Option<Usage>,
+    },
+    MessageStop,
+    Ping,
+    Error {
+        error: ApiError,
+    },
+}
+
+#[expect(
+    dead_code,
+    reason = "fields populated by serde, defined for full SSE protocol coverage"
+)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct MessageResponse {
+    pub id: String,
+    pub model: String,
+    pub usage: Option<Usage>,
+}
+
+#[expect(
+    dead_code,
+    reason = "fields populated by serde, defined for full SSE protocol coverage"
+)]
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum ContentBlockInfo {
+    Text { text: String },
+    ToolUse { id: String, name: String },
+}
+
+#[expect(
+    dead_code,
+    reason = "InputJsonDelta defined for full SSE protocol coverage"
+)]
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum Delta {
+    TextDelta { text: String },
+    InputJsonDelta { partial_json: String },
+}
+
+#[expect(
+    dead_code,
+    reason = "fields populated by serde, defined for full SSE protocol coverage"
+)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct MessageDeltaBody {
+    pub stop_reason: Option<String>,
+}
+
+#[expect(
+    dead_code,
+    reason = "fields populated by serde, defined for full SSE protocol coverage"
+)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct Usage {
+    #[serde(default)]
+    pub input_tokens: u32,
+    #[serde(default)]
+    pub output_tokens: u32,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ApiError {
+    #[serde(rename = "type")]
+    pub error_type: String,
+    pub message: String,
+}
+
+// ── Client ──
+
+pub struct Client {
+    http: reqwest::Client,
+    config: Config,
+}
+
+impl Client {
+    pub fn new(config: Config) -> Result<Self> {
+        let mut headers = HeaderMap::new();
+
+        let mut betas = vec![
+            CLAUDE_CODE_BETA_HEADER,
+            INTERLEAVED_THINKING_BETA_HEADER,
+            CONTEXT_1M_BETA_HEADER,
+        ];
+
+        match &config.auth {
+            Auth::ApiKey(key) => {
+                headers.insert("x-api-key", HeaderValue::from_str(key)?);
+            }
+            Auth::OAuth(token) => {
+                headers.insert(
+                    AUTHORIZATION,
+                    HeaderValue::from_str(&format!("Bearer {token}"))?,
+                );
+                betas.push(OAUTH_BETA_HEADER);
+            }
+        }
+
+        headers.insert("anthropic-beta", HeaderValue::from_str(&betas.join(","))?);
+        headers.insert("anthropic-version", HeaderValue::from_static(API_VERSION));
+        headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
+        headers.insert("x-app", HeaderValue::from_static("cli"));
+
+        let http = reqwest::Client::builder()
+            .default_headers(headers)
+            .build()
+            .context("failed to build HTTP client")?;
+
+        Ok(Self { http, config })
+    }
+
+    /// Stream a message response from the Anthropic API.
+    ///
+    /// Returns a channel receiver yielding [`StreamEvent`]s. The caller
+    /// should recv events as they arrive for real-time output.
+    pub fn stream_message(
+        &self,
+        messages: &[Message],
+        system: Option<&str>,
+    ) -> Result<mpsc::Receiver<Result<StreamEvent>>> {
+        let system_prompt = match system {
+            Some(s) => format!("{SYSTEM_PROMPT_PREFIX}\n{s}"),
+            None => SYSTEM_PROMPT_PREFIX.to_owned(),
+        };
+
+        let url = format!("{}/v1/messages", self.config.base_url);
+        let body = serde_json::to_value(CreateMessageRequest {
+            model: &self.config.model,
+            max_tokens: self.config.max_tokens,
+            messages,
+            system: &system_prompt,
+            stream: true,
+        })
+        .context("failed to serialize request")?;
+
+        let (tx, rx) = mpsc::channel(64);
+        let http = self.http.clone();
+
+        tokio::spawn(async move {
+            let result = stream_sse(&http, &url, &body, &tx).await;
+            if let Err(e) = result {
+                let _ = tx.send(Err(e)).await;
+            }
+        });
+
+        Ok(rx)
+    }
+}
+
+async fn stream_sse(
+    http: &reqwest::Client,
+    url: &str,
+    body: &serde_json::Value,
+    tx: &mpsc::Sender<Result<StreamEvent>>,
+) -> Result<()> {
+    let response = http.post(url).json(body).send().await?;
+
+    let status = response.status();
+    if !status.is_success() {
+        let body = response.text().await.unwrap_or_default();
+        bail!("API error (HTTP {status}): {body}");
+    }
+
+    let mut stream = response.bytes_stream();
+    let mut buf = String::new();
+
+    while let Some(chunk) = stream.next().await {
+        let chunk = chunk.context("error reading response stream")?;
+        buf.push_str(&String::from_utf8_lossy(&chunk));
+
+        // SSE frames are terminated by a blank line (\n\n).
+        while let Some(end) = buf.find("\n\n") {
+            let frame = buf[..end].to_owned();
+            buf.drain(..end + 2);
+
+            if let Some(event) = parse_sse_frame(&frame)?
+                && tx.send(Ok(event)).await.is_err()
+            {
+                return Ok(());
+            }
+        }
+    }
+
+    Ok(())
+}
+
+/// Parse a single SSE frame into a [`StreamEvent`].
+///
+/// SSE format:
+///
+/// ```text
+/// event: content_block_delta
+/// data: {"type":"content_block_delta", ...}
+/// ```
+fn parse_sse_frame(frame: &str) -> Result<Option<StreamEvent>> {
+    let mut data = None;
+
+    for line in frame.lines() {
+        if let Some(value) = line.strip_prefix("data: ") {
+            data = Some(value);
+        }
+    }
+
+    let Some(data) = data else {
+        return Ok(None);
+    };
+
+    let event: StreamEvent =
+        serde_json::from_str(data).with_context(|| format!("failed to parse SSE data: {data}"))?;
+
+    Ok(Some(event))
+}
+
+#[cfg(test)]
+mod tests {
+    use indoc::indoc;
+
+    use super::*;
+
+    // ── parse_sse_frame ──
+
+    #[test]
+    fn parse_sse_frame_text_delta() {
+        let frame = indoc! {r#"
+            event: content_block_delta
+            data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello"}}
+        "#};
+        let event = parse_sse_frame(frame).unwrap().unwrap();
+        assert!(matches!(
+            event,
+            StreamEvent::ContentBlockDelta {
+                index: 0,
+                delta: Delta::TextDelta { .. },
+            }
+        ));
+    }
+
+    #[test]
+    fn parse_sse_frame_ping() {
+        let frame = indoc! {r#"
+            event: ping
+            data: {"type":"ping"}
+        "#};
+        let event = parse_sse_frame(frame).unwrap().unwrap();
+        assert!(matches!(event, StreamEvent::Ping));
+    }
+
+    #[test]
+    fn parse_sse_frame_message_start() {
+        let frame = indoc! {r#"
+            event: message_start
+            data: {"type":"message_start","message":{"id":"msg_123","type":"message","role":"assistant","content":[],"model":"claude-sonnet-4-20250514","stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":25,"output_tokens":1}}}
+        "#};
+        let event = parse_sse_frame(frame).unwrap().unwrap();
+        assert!(matches!(event, StreamEvent::MessageStart { .. }));
+    }
+
+    #[test]
+    fn parse_sse_frame_error_event() {
+        let frame = indoc! {r#"
+            event: error
+            data: {"type":"error","error":{"type":"rate_limit_error","message":"Too many requests"}}
+        "#};
+        let event = parse_sse_frame(frame).unwrap().unwrap();
+        assert!(matches!(event, StreamEvent::Error { .. }));
+    }
+
+    #[test]
+    fn parse_sse_frame_comment_only() {
+        let frame = ": comment line";
+        let event = parse_sse_frame(frame).unwrap();
+        assert!(event.is_none());
+    }
+
+    #[test]
+    fn parse_sse_frame_empty() {
+        let event = parse_sse_frame("").unwrap();
+        assert!(event.is_none());
+    }
+
+    #[test]
+    fn parse_sse_frame_invalid_json() {
+        let frame = "data: {not valid json}";
+        assert!(parse_sse_frame(frame).is_err());
+    }
+}
diff --git a/crates/oxide-code/src/config.rs b/crates/oxide-code/src/config.rs
new file mode 100644
index 00000000..f0dc432a
--- /dev/null
+++ b/crates/oxide-code/src/config.rs
@@ -0,0 +1,60 @@
+mod oauth;
+
+use anyhow::{Context, Result};
+
+const DEFAULT_MODEL: &str = "claude-opus-4-6";
+const DEFAULT_BASE_URL: &str = "https://api.anthropic.com";
+const DEFAULT_MAX_TOKENS: u32 = 16384;
+
+#[derive(Debug, Clone)]
+pub enum Auth {
+    /// Explicit API key (`x-api-key` header).
+    ApiKey(String),
+    /// OAuth access token from Claude Code (`Authorization: Bearer` header).
+    OAuth(String),
+}
+
+#[derive(Debug, Clone)]
+pub struct Config {
+    pub auth: Auth,
+    pub model: String,
+    pub base_url: String,
+    pub max_tokens: u32,
+}
+
+impl Config {
+    /// Load configuration.
+    ///
+    /// Auth priority: `ANTHROPIC_API_KEY` env var > Claude Code OAuth
+    /// credentials at `~/.claude/.credentials.json`.
+    pub async fn load() -> Result<Self> {
+        let auth = if let Some(key) = non_empty_env("ANTHROPIC_API_KEY") {
+            Auth::ApiKey(key)
+        } else {
+            let token = oauth::load_token()
+                .await
+                .context("ANTHROPIC_API_KEY not set and Claude Code credentials not found")?;
+            Auth::OAuth(token)
+        };
+
+        let model = non_empty_env("ANTHROPIC_MODEL").unwrap_or_else(|| DEFAULT_MODEL.to_owned());
+
+        let base_url =
+            non_empty_env("ANTHROPIC_BASE_URL").unwrap_or_else(|| DEFAULT_BASE_URL.to_owned());
+
+        let max_tokens = non_empty_env("ANTHROPIC_MAX_TOKENS")
+            .and_then(|v| v.parse().ok())
+            .unwrap_or(DEFAULT_MAX_TOKENS);
+
+        Ok(Self {
+            auth,
+            model,
+            base_url,
+            max_tokens,
+        })
+    }
+}
+
+fn non_empty_env(key: &str) -> Option<String> {
+    std::env::var(key).ok().filter(|v| !v.is_empty())
+}
diff --git a/crates/oxide-code/src/config/oauth.rs b/crates/oxide-code/src/config/oauth.rs
new file mode 100644
index 00000000..37b7b12c
--- /dev/null
+++ b/crates/oxide-code/src/config/oauth.rs
@@ -0,0 +1,490 @@
+use std::path::{Path, PathBuf};
+use std::time::Duration;
+
+use anyhow::{Context, Result, bail};
+use serde::{Deserialize, Serialize};
+use tracing::warn;
+
+const OAUTH_TOKEN_URL: &str = "https://platform.claude.com/v1/oauth/token";
+const OAUTH_CLIENT_ID: &str = "9d1c250a-e61b-44d9-88ed-5944d1962f5e";
+const OAUTH_SCOPES: &[&str] = &[
+    "user:file_upload",
+    "user:inference",
+    "user:mcp_servers",
+    "user:profile",
+    "user:sessions:claude_code",
+];
+const TOKEN_EXPIRY_BUFFER_MS: u64 = 5 * 60 * 1000;
+const REFRESH_TIMEOUT: Duration = Duration::from_secs(15);
+
+const LOCK_MAX_RETRIES: u32 = 5;
+const LOCK_RETRY_INTERVAL: Duration = Duration::from_millis(1000);
+const LOCK_STALE_THRESHOLD: Duration = Duration::from_secs(30);
+
+// ── Credential Types ──
+
+#[derive(Deserialize)]
+struct CredentialsFile {
+    #[serde(rename = "claudeAiOauth")]
+    claude_ai_oauth: OAuthCredential,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct OAuthCredential {
+    access_token: String,
+    #[serde(default)]
+    refresh_token: Option<String>,
+    expires_at: i64,
+}
+
+impl OAuthCredential {
+    fn expires_at_ms(&self) -> u64 {
+        u64::try_from(self.expires_at).unwrap_or(0)
+    }
+}
+
+// ── Token Loading ──
+
+/// Load an OAuth access token from Claude Code's credentials file, refreshing
+/// proactively if the token is within 5 minutes of expiry.
+pub async fn load_token() -> Result<String> {
+    let path = credentials_path().context("could not determine home directory")?;
+    let oauth = read_credentials(&path)?.claude_ai_oauth;
+    let expires_at_ms = oauth.expires_at_ms();
+
+    // Token is valid and not near-expiry
+    if !is_near_expiry(expires_at_ms) {
+        return Ok(oauth.access_token);
+    }
+
+    // No refresh token — use as-is if not yet expired
+    if oauth.refresh_token.is_none() {
+        if is_expired(expires_at_ms) {
+            bail!("Claude Code OAuth token has expired — run `claude` to refresh");
+        }
+        warn!("OAuth token expires soon but no refresh token available");
+        return Ok(oauth.access_token);
+    }
+
+    // Acquire lock and re-read (another process may have refreshed)
+    let lock_path = lock_path().context("could not determine home directory")?;
+    let _lock = acquire_lock(&lock_path).await?;
+
+    let oauth = read_credentials(&path)?.claude_ai_oauth;
+    let expires_at_ms = oauth.expires_at_ms();
+
+    if !is_near_expiry(expires_at_ms) {
+        return Ok(oauth.access_token);
+    }
+
+    let refresh_token = oauth
+        .refresh_token
+        .as_deref()
+        .context("refresh token missing after re-read")?;
+
+    match refresh_oauth_token(refresh_token).await {
+        Ok(response) => {
+            write_refreshed_credentials(&path, &response)?;
+            Ok(response.access_token)
+        }
+        Err(e) if is_expired(expires_at_ms) => {
+            Err(e).context("failed to refresh expired OAuth token")
+        }
+        Err(e) => {
+            warn!("failed to refresh OAuth token, using existing: {e:#}");
+            Ok(oauth.access_token)
+        }
+    }
+}
+
+fn read_credentials(path: &Path) -> Result<CredentialsFile> {
+    let content = std::fs::read_to_string(path)
+        .with_context(|| format!("failed to read {}", path.display()))?;
+    serde_json::from_str(&content).context("failed to parse Claude Code credentials")
+}
+
+fn is_near_expiry(expires_at_ms: u64) -> bool {
+    now_millis() + TOKEN_EXPIRY_BUFFER_MS >= expires_at_ms
+}
+
+fn is_expired(expires_at_ms: u64) -> bool {
+    now_millis() >= expires_at_ms
+}
+
+// ── Token Refresh ──
+
+#[derive(Serialize)]
+struct RefreshRequest<'a> {
+    grant_type: &'a str,
+    refresh_token: &'a str,
+    client_id: &'a str,
+    scope: &'a str,
+}
+
+async fn refresh_oauth_token(refresh_token: &str) -> Result<RefreshResponse> {
+    let client = reqwest::Client::builder()
+        .timeout(REFRESH_TIMEOUT)
+        .build()?;
+
+    let scope = OAUTH_SCOPES.join(" ");
+    let response = client
+        .post(OAUTH_TOKEN_URL)
+        .json(&RefreshRequest {
+            grant_type: "refresh_token",
+            refresh_token,
+            client_id: OAUTH_CLIENT_ID,
+            scope: &scope,
+        })
+        .send()
+        .await
+        .context("failed to send token refresh request")?;
+
+    if !response.status().is_success() {
+        let status = response.status();
+        let body = response.text().await.unwrap_or_default();
+        bail!("token refresh failed with {status}: {body}");
+    }
+
+    response
+        .json()
+        .await
+        .context("failed to parse token refresh response")
+}
+
+#[derive(Deserialize)]
+struct RefreshResponse {
+    access_token: String,
+    refresh_token: String,
+    expires_in: u64,
+    #[serde(default)]
+    scope: Option<String>,
+}
+
+/// Write refreshed tokens back to the credentials file, preserving unknown fields.
+///
+/// Must be called while holding the [`LockGuard`] from [`acquire_lock`].
+fn write_refreshed_credentials(path: &Path, response: &RefreshResponse) -> Result<()> {
+    let content = std::fs::read_to_string(path)?;
+    let mut json: serde_json::Value =
+        serde_json::from_str(&content).context("failed to parse credentials for update")?;
+
+    let oauth = json
+        .get_mut("claudeAiOauth")
+        .context("missing claudeAiOauth in credentials")?;
+
+    oauth["accessToken"] = serde_json::Value::String(response.access_token.clone());
+    oauth["refreshToken"] = serde_json::Value::String(response.refresh_token.clone());
+    // Computed from local clock — will be wrong if the machine clock is skewed,
+    // but the refresh endpoint only returns a relative `expires_in`, not an
+    // absolute timestamp.
+    oauth["expiresAt"] = serde_json::json!(now_millis() + response.expires_in * 1000);
+
+    if let Some(scope) = &response.scope {
+        let scopes: Vec<&str> = scope.split(' ').collect();
+        oauth["scopes"] = serde_json::json!(scopes);
+    }
+
+    let serialized = serde_json::to_string_pretty(&json)?;
+    std::fs::write(path, serialized.as_bytes())?;
+
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        std::fs::set_permissions(path, std::fs::Permissions::from_mode(0o600))?;
+    }
+
+    Ok(())
+}
+
+fn now_millis() -> u64 {
+    u64::try_from(
+        std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .expect("system clock before epoch")
+            .as_millis(),
+    )
+    .expect("current time fits in u64")
+}
+
+fn credentials_path() -> Option<PathBuf> {
+    dirs::home_dir().map(|h| h.join(".claude").join(".credentials.json"))
+}
+
+// ── File Locking ──
+
+/// RAII guard that removes the lock directory on drop.
+struct LockGuard {
+    path: PathBuf,
+}
+
+impl Drop for LockGuard {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_dir_all(&self.path);
+    }
+}
+
+/// Acquire a directory-based lock, compatible with `proper-lockfile` (used by
+/// Claude Code). Retries with fixed interval and breaks stale locks.
+async fn acquire_lock(path: &Path) -> Result<LockGuard> {
+    for attempt in 0..=LOCK_MAX_RETRIES {
+        match std::fs::create_dir(path) {
+            Ok(()) => {
+                return Ok(LockGuard {
+                    path: path.to_owned(),
+                });
+            }
+            Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => {
+                if is_stale_lock(path) {
+                    let _ = std::fs::remove_dir_all(path);
+                    continue;
+                }
+                if attempt == LOCK_MAX_RETRIES {
+                    bail!(
+                        "failed to acquire credentials lock after {LOCK_MAX_RETRIES} retries \
+                         — another process may be refreshing"
+                    );
+                }
+                tokio::time::sleep(LOCK_RETRY_INTERVAL).await;
+            }
+            Err(e) => {
+                return Err(e)
+                    .with_context(|| format!("failed to create lock at {}", path.display()));
+            }
+        }
+    }
+    unreachable!()
+}
+
+fn is_stale_lock(path: &Path) -> bool {
+    std::fs::metadata(path)
+        .and_then(|m| m.modified())
+        .map_or(true, |t| {
+            t.elapsed().unwrap_or_default() > LOCK_STALE_THRESHOLD
+        })
+}
+
+fn lock_path() -> Option<PathBuf> {
+    dirs::home_dir().map(|h| h.join(".claude.lock"))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // ── OAuthCredential::expires_at_ms ──
+
+    #[test]
+    fn expires_at_ms_positive_value() {
+        let cred = OAuthCredential {
+            access_token: String::new(),
+            refresh_token: None,
+            expires_at: 1_700_000_000_000,
+        };
+        assert_eq!(cred.expires_at_ms(), 1_700_000_000_000);
+    }
+
+    #[test]
+    fn expires_at_ms_negative_clamps_to_zero() {
+        let cred = OAuthCredential {
+            access_token: String::new(),
+            refresh_token: None,
+            expires_at: -1,
+        };
+        assert_eq!(cred.expires_at_ms(), 0);
+    }
+
+    // ── read_credentials ──
+
+    #[test]
+    fn read_credentials_valid_with_refresh_token() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("creds.json");
+
+        std::fs::write(
+            &path,
+            indoc::indoc! {r#"
+                {
+                    "claudeAiOauth": {
+                        "accessToken": "tok",
+                        "refreshToken": "ref",
+                        "expiresAt": 9999999999999
+                    }
+                }
+            "#},
+        )
+        .unwrap();
+
+        let creds = read_credentials(&path).unwrap();
+        assert_eq!(creds.claude_ai_oauth.access_token, "tok");
+        assert_eq!(creds.claude_ai_oauth.refresh_token.as_deref(), Some("ref"));
+        assert_eq!(creds.claude_ai_oauth.expires_at, 9_999_999_999_999);
+    }
+
+    #[test]
+    fn read_credentials_missing_refresh_token_field() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("creds.json");
+
+        std::fs::write(
+            &path,
+            indoc::indoc! {r#"
+                {
+                    "claudeAiOauth": {
+                        "accessToken": "tok",
+                        "expiresAt": 9999999999999
+                    }
+                }
+            "#},
+        )
+        .unwrap();
+
+        let creds = read_credentials(&path).unwrap();
+        assert!(creds.claude_ai_oauth.refresh_token.is_none());
+    }
+
+    #[test]
+    fn read_credentials_missing_file() {
+        assert!(read_credentials(Path::new("/nonexistent/creds.json")).is_err());
+    }
+
+    #[test]
+    fn read_credentials_invalid_json() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("creds.json");
+        std::fs::write(&path, "not json").unwrap();
+        assert!(read_credentials(&path).is_err());
+    }
+
+    #[test]
+    fn read_credentials_missing_oauth_key() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("creds.json");
+        std::fs::write(&path, r#"{"other": "data"}"#).unwrap();
+        assert!(read_credentials(&path).is_err());
+    }
+
+    // ── is_near_expiry ──
+
+    #[test]
+    fn is_near_expiry_far_future() {
+        assert!(!is_near_expiry(u64::MAX));
+    }
+
+    #[test]
+    fn is_near_expiry_zero_is_expired() {
+        assert!(is_near_expiry(0));
+    }
+
+    // ── is_expired ──
+
+    #[test]
+    fn is_expired_far_future() {
+        assert!(!is_expired(u64::MAX));
+    }
+
+    #[test]
+    fn is_expired_zero() {
+        assert!(is_expired(0));
+    }
+
+    // ── write_refreshed_credentials ──
+
+    #[test]
+    fn write_refreshed_credentials_preserves_unknown_fields() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("credentials.json");
+
+        std::fs::write(
+            &path,
+            indoc::indoc! {r#"
+                {
+                    "claudeAiOauth": {
+                        "accessToken": "old-access",
+                        "refreshToken": "old-refresh",
+                        "expiresAt": 1000,
+                        "scopes": ["user:profile"],
+                        "subscriptionType": "pro",
+                        "rateLimitTier": "default"
+                    }
+                }
+            "#},
+        )
+        .unwrap();
+
+        let response = RefreshResponse {
+            access_token: "new-access".to_owned(),
+            refresh_token: "new-refresh".to_owned(),
+            expires_in: 3600,
+            scope: Some("user:profile user:inference".to_owned()),
+        };
+
+        write_refreshed_credentials(&path, &response).unwrap();
+
+        let content = std::fs::read_to_string(&path).unwrap();
+        let json: serde_json::Value = serde_json::from_str(&content).unwrap();
+        let oauth = &json["claudeAiOauth"];
+
+        assert_eq!(oauth["accessToken"], "new-access");
+        assert_eq!(oauth["refreshToken"], "new-refresh");
+        assert!(oauth["expiresAt"].as_u64().unwrap() > 1000);
+        assert_eq!(
+            oauth["scopes"],
+            serde_json::json!(["user:profile", "user:inference"])
+        );
+        // Unknown fields preserved
+        assert_eq!(oauth["subscriptionType"], "pro");
+        assert_eq!(oauth["rateLimitTier"], "default");
+    }
+
+    #[test]
+    fn write_refreshed_credentials_skips_scopes_when_absent() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("credentials.json");
+
+        std::fs::write(
+            &path,
+            indoc::indoc! {r#"
+                {
+                    "claudeAiOauth": {
+                        "accessToken": "old",
+                        "refreshToken": "old",
+                        "expiresAt": 1000,
+                        "scopes": ["user:profile"]
+                    }
+                }
+            "#},
+        )
+        .unwrap();
+
+        let response = RefreshResponse {
+            access_token: "new".to_owned(),
+            refresh_token: "new".to_owned(),
+            expires_in: 3600,
+            scope: None,
+        };
+
+        write_refreshed_credentials(&path, &response).unwrap();
+
+        let content = std::fs::read_to_string(&path).unwrap();
+        let json: serde_json::Value = serde_json::from_str(&content).unwrap();
+        let oauth = &json["claudeAiOauth"];
+
+        // Original scopes preserved when refresh response has no scope
+        assert_eq!(oauth["scopes"], serde_json::json!(["user:profile"]));
+    }
+
+    // ── acquire_lock ──
+
+    #[tokio::test]
+    async fn acquire_lock_creates_and_drop_removes() {
+        let dir = tempfile::tempdir().unwrap();
+        let lock_path = dir.path().join("test.lock");
+
+        let guard = acquire_lock(&lock_path).await.unwrap();
+        assert!(lock_path.exists());
+
+        drop(guard);
+        assert!(!lock_path.exists());
+    }
+}
diff --git a/crates/oxide-code/src/main.rs b/crates/oxide-code/src/main.rs
index 66031b6b..9fbed4c6 100644
--- a/crates/oxide-code/src/main.rs
+++ b/crates/oxide-code/src/main.rs
@@ -1,14 +1,88 @@
+mod client;
+mod config;
+mod message;
+
+use std::io::Write;
+
+use anyhow::{Context, Result};
 use clap::Parser;
+use tokio::io::{AsyncBufReadExt, BufReader};
+
+use client::anthropic::{Client, Delta, StreamEvent};
+use config::Config;
+use message::Message;
 
 #[derive(Parser)]
-#[command(
-    name = "oxide-code",
-    version,
-    about = "A terminal-based AI coding assistant"
-)]
+#[command(name = "ox", version, about = "A terminal-based AI coding assistant")]
 struct Cli {}
 
-fn main() {
+#[tokio::main]
+async fn main() -> Result<()> {
     let _cli = Cli::parse();
-    println!("oxide-code");
+
+    tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .init();
+
+    let config = Config::load().await?;
+    let client = Client::new(config)?;
+
+    repl(&client).await
+}
+
+async fn repl(client: &Client) -> Result<()> {
+    let stdin = BufReader::new(tokio::io::stdin());
+    let mut lines = stdin.lines();
+    let mut messages: Vec<Message> = Vec::new();
+
+    loop {
+        eprint!("> ");
+        std::io::stderr().flush()?;
+
+        let Some(line) = lines.next_line().await? else {
+            break; // EOF
+        };
+
+        let input = line.trim().to_owned();
+        if input.is_empty() {
+            continue;
+        }
+
+        messages.push(Message::user(&input));
+
+        let reply = send_and_print(client, &messages).await?;
+        messages.push(Message::assistant(&reply));
+    }
+
+    Ok(())
+}
+
+async fn send_and_print(client: &Client, messages: &[Message]) -> Result<String> {
+    let mut rx = client.stream_message(messages, None)?;
+    let mut full_text = String::new();
+    let mut stdout = std::io::stdout();
+
+    while let Some(event) = rx.recv().await {
+        let event = event.context("stream error")?;
+
+        match event {
+            StreamEvent::ContentBlockDelta {
+                delta: Delta::TextDelta { text },
+                ..
+            } => {
+                full_text.push_str(&text);
+                write!(stdout, "{text}")?;
+                stdout.flush()?;
+            }
+            StreamEvent::Error { error } => {
+                anyhow::bail!("API error ({}): {}", error.error_type, error.message);
+            }
+            _ => {}
+        }
+    }
+
+    // Newline after streamed response
+    writeln!(stdout)?;
+
+    Ok(full_text)
 }
diff --git a/crates/oxide-code/src/message.rs b/crates/oxide-code/src/message.rs
new file mode 100644
index 00000000..d5b23b94
--- /dev/null
+++ b/crates/oxide-code/src/message.rs
@@ -0,0 +1,76 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Role {
+    User,
+    Assistant,
+}
+
+/// A content block within a message.
+///
+/// User messages typically contain `Text` or `ToolResult` blocks.
+/// Assistant messages typically contain `Text` or `ToolUse` blocks.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum ContentBlock {
+    Text {
+        text: String,
+    },
+    ToolUse {
+        id: String,
+        name: String,
+        input: serde_json::Value,
+    },
+    ToolResult {
+        tool_use_id: String,
+        content: String,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Message {
+    pub role: Role,
+    pub content: Vec<ContentBlock>,
+}
+
+impl Message {
+    pub fn user(text: impl Into<String>) -> Self {
+        Self {
+            role: Role::User,
+            content: vec![ContentBlock::Text { text: text.into() }],
+        }
+    }
+
+    pub fn assistant(text: impl Into<String>) -> Self {
+        Self {
+            role: Role::Assistant,
+            content: vec![ContentBlock::Text { text: text.into() }],
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // ── Message::user ──
+
+    #[test]
+    fn user_creates_user_role_with_text() {
+        let msg = Message::user("hello");
+        assert_eq!(msg.role, Role::User);
+        assert_eq!(msg.content.len(), 1);
+        assert!(matches!(&msg.content[0], ContentBlock::Text { text } if text == "hello"));
+    }
+
+    // ── Message::assistant ──
+
+    #[test]
+    fn assistant_creates_assistant_role_with_text() {
+        let msg = Message::assistant("hi");
+        assert_eq!(msg.role, Role::Assistant);
+        assert_eq!(msg.content.len(), 1);
+        assert!(matches!(&msg.content[0], ContentBlock::Text { text } if text == "hi"));
+    }
+}
diff --git a/docs/README.md b/docs/README.md
new file mode 100644
index 00000000..65814edf
--- /dev/null
+++ b/docs/README.md
@@ -0,0 +1,8 @@
+# Documentation Index
+
+Internal docs for oxide-code development: research findings, architecture notes, and project status.
+
+| Document                                               | Description                                                            |
+| ------------------------------------------------------ | ---------------------------------------------------------------------- |
+| [roadmap.md](roadmap.md)                               | Project status: working features, current focus, planned phases        |
+| [research/anthropic-api.md](research/anthropic-api.md) | Anthropic API auth: OAuth flow, required headers, system prompt prefix |
diff --git a/docs/research/anthropic-api.md b/docs/research/anthropic-api.md
new file mode 100644
index 00000000..a428e44d
--- /dev/null
+++ b/docs/research/anthropic-api.md
@@ -0,0 +1,107 @@
+# Anthropic API Authentication
+
+Research notes on how to authenticate with the Anthropic Messages API using OAuth tokens from Claude Code. These findings are based on reverse-engineering [`claude-code`](https://github.com/hakula139/claude-code) (v2.1.88) and testing against the production API.
+
+## Authentication Methods
+
+### API Key
+
+Standard approach. Set `x-api-key` header directly.
+
+### OAuth (Claude Code Credentials)
+
+Claude Code stores OAuth tokens at `~/.claude/.credentials.json` (plaintext on Linux, macOS Keychain with plaintext fallback on macOS).
+
+```json
+{
+  "claudeAiOauth": {
+    "accessToken": "...",
+    "refreshToken": "...",
+    "expiresAt": 1234567890000,
+    "scopes": ["user:inference", "user:profile", "..."]
+  }
+}
+```
+
+OAuth requests use `Authorization: Bearer <token>` (not `x-api-key`).
+
+## Required Headers and Parameters
+
+Three things are required for OAuth tokens to work with non-Haiku models:
+
+### 1. Beta headers
+
+```text
+anthropic-beta: claude-code-20250219,oauth-2025-04-20
+```
+
+- `claude-code-20250219` — identifies the request as a Claude Code client.
+- `oauth-2025-04-20` — enables OAuth authentication.
+
+Additional useful betas:
+
+| Header                            | Purpose                        |
+| --------------------------------- | ------------------------------ |
+| `interleaved-thinking-2025-05-14` | Extended thinking support      |
+| `context-1m-2025-08-07`           | 1M context window              |
+| `context-management-2025-06-27`   | Context management             |
+| `prompt-caching-scope-2026-01-05` | Prompt caching                 |
+| `effort-2025-11-24`               | Effort control                 |
+| `advanced-tool-use-2025-11-20`    | Tool search (first-party only) |
+
+### 2. System prompt prefix
+
+```text
+You are Claude Code, Anthropic's official CLI for Claude.
+```
+
+This must be the start of the system prompt. The API server uses it to identify legitimate Claude Code clients and apply correct rate limits. **Without this prefix, OAuth requests for Opus and Sonnet models return 429.**
+
+### 3. Client identity header
+
+```text
+x-app: cli
+```
+
+## What Happens Without These
+
+| Missing                | Haiku 4.5 | Sonnet / Opus |
+| ---------------------- | --------- | ------------- |
+| `claude-code-20250219` | 200       | 429           |
+| `oauth-2025-04-20`     | 401       | 401           |
+| System prompt prefix   | 200       | 429           |
+
+## API Version
+
+The `anthropic-version` header is `2023-06-01` across all claude-code endpoints. This is the only stable API version.
+
+## Model IDs
+
+The API model ID for Opus 4.6 is `claude-opus-4-6`. The `[1m]` suffix (e.g., `claude-opus-4-6[1m]`) is a client-side convention that claude-code strips before sending to the API via `normalizeModelStringForAPI()`. The 1M context window is activated by the `context-1m-2025-08-07` beta header, not the model ID.
+
+## SDK vs Raw HTTP
+
+Claude Code uses the Anthropic TypeScript SDK with `authToken` (not `apiKey`) for OAuth. The SDK:
+
+- Sends `Authorization: Bearer <token>` internally.
+- Adds `?beta=true` query parameter to the URL.
+- Includes `x-stainless-*` headers (SDK telemetry).
+- Retries on `x-should-retry: true` responses with exponential backoff.
+
+For raw HTTP (as in oxide-code), replicate the headers manually. The `?beta=true` query parameter and `x-stainless-*` headers are not required.
+
+## Token Refresh
+
+OAuth tokens expire (check `expiresAt` in milliseconds). Claude Code refreshes them automatically with a 5-minute buffer before expiry, using a `POST` to `platform.claude.com/v1/oauth/token` with the `refresh_token`. Cross-process safety is handled via directory-based locking (`proper-lockfile` creates a `~/.claude.lock/` directory).
+
+oxide-code implements the same refresh flow: proactive refresh with the 5-minute buffer, directory-based locking compatible with Claude Code, and credential write-back preserving unknown fields.
+
+## Sources
+
+- `claude-code/src/constants/betas.ts` — beta header constants
+- `claude-code/src/constants/oauth.ts` — OAuth client ID, token URL, scopes
+- `claude-code/src/constants/system.ts` — system prompt prefix
+- `claude-code/src/services/api/client.ts` — SDK client construction
+- `claude-code/src/services/oauth/client.ts` — token refresh endpoint and request format
+- `claude-code/src/utils/auth.ts` — OAuth token retrieval and refresh
+- `claude-code/src/utils/secureStorage/plainTextStorage.ts` — credential file I/O
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 9b8418d9..c7749bc9 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -10,7 +10,10 @@ The project direction is simple:
 
 ## Working Today
 
-Nothing yet — the project has just been scaffolded with CI, conventions, and a CLI skeleton.
+- Async REPL that reads user input and streams responses from the Anthropic Messages API.
+- OAuth authentication via Claude Code credentials (`~/.claude/.credentials.json`).
+- API key authentication via `ANTHROPIC_API_KEY` environment variable.
+- Configurable model, base URL, and max tokens via environment variables.
 
 ## Current Focus
 
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..2ff68cbc
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,6 @@
+[project]
+name = "oxide-code"
+version = "0.1.0"
+description = "Utility scripts for oxide-code development"
+requires-python = ">=3.13"
+dependencies = ["anthropic>=0.52"]
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 00000000..8f6c9a33
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,276 @@
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