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[Bug]: Native Claude beta allowlist drops current Claude Code betas and the context_management body field #7042
Description
Client or integration
Claude Code
Area
Provider adapter
Summary
Even for a recognized native Claude Code client on a first-party route, allowlistAnthropicBetas (src/adapters/anthropic/beta-allowlist.ts:42) only forwards a fixed list. Several betas current Claude Code sends are dropped silently, and the matching body field context_management is not in ANTHROPIC_MESSAGES_PASSTHROUGH_FIELDS (src/adapters/anthropic/passthrough.ts:40), so Claude Code's server-side context management never reaches the API.
Reproduction
Captured from Claude Code 2.1.296 (interactive CLI, native Anthropic route through an ocx hub):
anthropic-beta sent:
claude-code-20250219, interleaved-thinking-2025-05-14, thinking-token-count-2026-05-13,
context-management-2025-06-27, prompt-caching-scope-2026-01-05,
mid-conversation-system-2026-04-07, per-turn-control-2026-07-01,
mid-conversation-tool-changes-2026-07-01, inline-tools-2026-09-15,
advisor-tool-2026-03-01, advanced-tool-use-2025-11-20, effort-2025-11-24
body keys sent:
context_management, max_tokens, messages, metadata, model, output_config,
stream, system, thinking, tools
Dropped by 2.84.0 (offline, providerClass="first-party", observedNativeClient=true):
thinking-token-count-2026-05-13, context-management-2025-06-27, mid-conversation-tool-changes-2026-07-01, advanced-tool-use-2025-11-20, effort-2025-11-24 (plus extended-cache-ttl, context-1m, tool-search-tool when present). The context_management body field is removed by the passthrough field allowlist. The log only says anthropic-beta-dropped without naming values.
Version
@bitkyc08/opencodex 2.84.0, Claude Code 2.1.296
Operating system
macOS 27; the filter is platform independent.
Provider and model
anthropic (OAuth pool), claude-fable-5-1 / claude-opus-5-5 / claude-haiku-5-5
Logs or error output
anthropic-beta-dropped
No 400s: the requests succeed, the features are silently disabled.
Redacted configuration
Hub mode, Claude Code via ocx claude, ENABLE_TOOL_SEARCH=true.
Proposed fix
For recognized native clients on first-party routes, forward header/body capability pairs coherently (at least context-management-2025-06-27 together with context_management), keeping proxy-owned OAuth/tier betas authoritative and never extending this to translated or third-party routes. Naming the dropped values in the log line (anthropic-beta-dropped=<list>) would make the next drift visible. The Claude Code gateway guide warns against pinning individual beta values: https://code.claude.com/docs/en/llm-gateway-protocol
Related: #6895 (per-message effort, different code path).
Screenshots and supporting files
No response
Checks
- I searched existing issues and documentation.
- I removed secrets, tokens, account details, request credentials, and personal data.
Activity
fix(anthropic): name only known dropped betas; map OAuth exclude_tools (
fix(anthropic): forward context management for native Claude clients (#…
lidge-jun commentedon Oct 13, 2026
Fixed on dev by #7067 (1ff4f7c). A recognized native Claude Code client on a first-party route now forwards
context-management-2025-06-27together withcontext_management; OAuth also rewritesexclude_toolsto the prefixed tool names. Dropped betas are logged once per distinct set asanthropic-beta-dropped=<names>. Only known Anthropic beta names are named; anything else is counted. The other betas from the report stay dropped for now and will show up in that log line.