[nwparker]

	Files	Added	Deleted	Net
Test	2	$\color{#1a7f37}{\Huge{\mathbf{+}}}$​8	$\color{#cf222e}{\Huge{\mathbf{−}}}$​6	$\color{#1a7f37}{\Huge{\mathbf{+}}}$​2
Prod	1	$\color{#1a7f37}{\Huge{\mathbf{+}}}$​3	$\color{#cf222e}{\Huge{\mathbf{−}}}$​5	$\color{#cf222e}{\Huge{\mathbf{−}}}$​2

ELI5

When Orca launched Devin with a prompt, it typed the prompt into the terminal about 30ms after Devin started. Devin wasn't reading input yet, so the prompt was lost even though the launch said it worked. Now the prompt goes on Devin's command line (devin … -- '<prompt>'), which Devin documents as "starts an interactive session" with that prompt, the same way Orca launches Trae, Grok, and Prime Agent.

Root cause

Devin used promptInjectionMode: 'stdin-after-start'. The readiness poll waits for the foreground process to be named devin, and that is true right away, before Devin's REPL is reading input. So the follow-up write got there first and was dropped.

Upstream contract (installed devin 3000.10.31, devin --help):

• Usage: devin [OPTIONS] [PATH]... [-- <PROMPT>...] [COMMAND]
• [PROMPT]... Your prompt (use -- before the prompt). Starts an interactive session. Use -p/--print for non-interactive mode.

Devin has no --prompt flag. The positional prompt after -- is the documented interactive form, and --prompt-file is the only other way to seed one.

What changed

• src/shared/tui-agent-config.ts: Devin now uses promptInjectionMode: 'argv' with argvPromptSeparator: '--'.
• The startup-plan tests (shared and renderer) now expect the prompt in argv and followupPrompt: null.
• Contributor commit from fix(runtime): deliver Devin launch prompts via argv instead of stdin-after-start #26387 by ggbdpq, rebased onto current main. I resolved the conflict where the shared startup test moved into tui-agent-startup.spec.ts, and dropped its 81-line runtime spec. That spec duplicated the plan pin, because followupPrompt: null already rules out a PTY write.
• No-prompt launches don't change. Draft launches (buildAgentDraftLaunchPlan) don't change either: Devin has no draft flag or env var, so drafts still use the paste path and do not auto-submit.

How verified

Ran the real Devin CLI (logged in) in a Python PTY harness, 120x40 TERM=xterm-256color, with the prompt "Compute 17*23 and reply with only the number, no tools.":

Scenario	Prompt delivered?	REPL still interactive?
Main behavior: devin, then prompt+CR written at 30ms (trusted dir)	No: no turn ran and the composer was empty. A second prompt typed later was answered (399), so the harness itself works	yes
This PR: devin --permission-mode bypass --respect-workspace-trust false -- '<prompt>' (exact Orca default args, fresh untrusted dir)	Yes: "Thinking", answer 391, OSC Devin finished	yes: a follow-up prompt typed afterwards was submitted and finished
devin -- '<prompt>' without Orca's default args, fresh dir	Yes, after the trust prompt	yes

Checks:

• pnpm test src/shared/tui-agent-startup.test.ts src/renderer/src/lib/tui-agent-startup.test.ts src/shared/tui-agent-prompt-transport.test.ts: pass.
• src/main/runtime/orca-runtime.test.ts: 2 failures in existing-folder import, and the same 2 fail on main db8fc6d0cc9b without this change.
• pnpm tc: pass.
• pnpm run check:code-quality:changed: pass.

Cross-platform / remote / mobile

• Quoting uses the shared quoteStartupArg (POSIX, PowerShell literal, cmd caret-escaping), the same path as the other agents that use the -- separator (trae, grok, prime-agent). On cmd.exe, multi-line prompts have the same limitation as every other argv agent.
• Remote: the plan is built by whichever runtime spawns the PTY. An older host keeps its old behavior, and there is no wire change.
• Mobile and folder workspaces are not affected; this is launch-command shape only.

Risk

Low. The change is a single config line. If a Windows PowerShell shim ever stripped --, Devin would read the prompt as [PATH] and open Desktop. I haven't verified this on Windows; trae, grok, and prime-agent already use the same separator.

Fixes #26302
Supersedes #26387

Co-authored-by: ggbdpq 67929842+ggbdpq@users.noreply.github.com

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Files selected for processing: 3

• src/renderer/src/lib/tui-agent-startup.test.ts
• src/shared/tui-agent-config.ts
• src/shared/tui-agent-startup.spec.ts

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