- Introduced unit tests for request logging middleware to enhance coverage.
- Added WebSocket-based Codex executor to support Responses API upgrade.
- Updated middleware logic to selectively capture request bodies for memory efficiency.
- Enhanced Codex configuration handling with new WebSocket attributes.
Update hardcoded X-Stainless-* and User-Agent defaults to match
Claude Code 2.1.44 / @anthropic-ai/sdk 0.74.0 (verified via
diagnostic proxy capture 2026-02-17).
Changes:
- X-Stainless-Os/Arch: dynamic via runtime.GOOS/GOARCH
- X-Stainless-Package-Version: 0.55.1 → 0.74.0
- X-Stainless-Timeout: 60 → 600
- User-Agent: claude-cli/1.0.83 (external, cli) → claude-cli/2.1.44 (external, sdk-cli)
Add claude-header-defaults config section so values can be updated
without recompilation when Claude Code releases new versions.
Allow disabling the proxy_ tool name prefix on a per-account basis.
Users who route their own Anthropic account through CPA can set
"tool_prefix_disabled": true in their OAuth auth JSON to send tool
names unchanged to Anthropic.
Default behavior is fully preserved — prefix is applied unless
explicitly disabled.
Changes:
- Add ToolPrefixDisabled() accessor to Auth (reads metadata key
"tool_prefix_disabled" or "tool-prefix-disabled")
- Gate all 6 prefix apply/strip points with the new flag
- Add unit tests for the accessor
The proxy_ prefix logic correctly skips built-in tools (those with a
non-empty "type" field) in tools[] definitions but does not skip them
in messages[].content[] tool_use blocks or tool_choice. This causes
web_search in conversation history to become proxy_web_search, which
Anthropic does not recognize.
Fix: collect built-in tool names from tools[] into a set and also
maintain a hardcoded fallback set (web_search, code_execution,
text_editor, computer) for cases where the built-in tool appears in
history but not in the current request's tools[] array. Skip prefixing
in messages and tool_choice when name matches a built-in.
- Fix X-Initiator detection: check for any assistant/tool role
in messages instead of only the last message role, matching
the correct agent detection for multi-turn tool conversations
- Add x-github-api-version: 2025-04-01 header for API compatibility
- Support Business/Enterprise accounts by using Endpoints.API from
the Copilot token response instead of hardcoded base URL
- Fix Responses API vision detection: detect vision content before
input normalization removes the messages array
- Add 8 test cases covering the above fixes
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Change Openai-Intent header from "conversation-edits" to
"conversation-panel" to avoid triggering GitHub's premium
execution path, which caused included models (0x multiplier)
to be billed as premium requests.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Collect built-in tool names (those with a "type" field like
web_search, code_execution) and skip prefixing tool_reference
blocks that reference them, preventing name mismatch.
- Refactor if-else if chains to switch statements in all three
prefix functions for idiomatic Go style.
tool_reference blocks can appear nested inside tool_result.content[]
arrays, not just at the top level of messages[].content[]. The prefix
logic now iterates into tool_result blocks with array content to find
and prefix/strip nested tool_reference.tool_name fields.
applyClaudeToolPrefix, stripClaudeToolPrefixFromResponse, and
stripClaudeToolPrefixFromStreamLine now handle "tool_reference" blocks
(field "tool_name") in addition to "tool_use" blocks (field "name").
Without this fix, tool_reference blocks in conversation history retain
their original unprefixed names while tool definitions carry the proxy_
prefix, causing Anthropic API 400 errors: "Tool reference 'X' not found
in available tools."
Co-authored-by: Kirill Turanskiy <kt@novamedia.ru>
- Add response.function_call_arguments.delta handler for tool call parameters
- Rewrite normalizeGitHubCopilotResponsesInput to produce structured input
array (message/function_call/function_call_output) instead of flattened
text, fixing infinite loop in multi-turn tool-use conversations
- Skip flattenAssistantContent for messages containing tool_use blocks,
preventing function_call items from being destroyed
- Add reasoning/thinking stream & non-stream support
- Fix stop_reason mapping (max_tokens/stop) and cached token reporting
- Update test to match new array-based input format
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The normalizeGitHubCopilotResponsesTools filter required type="function",
which dropped Claude-format tools (no type field, uses input_schema).
Relax the filter to accept tools without a type field and map input_schema
to parameters so tools are correctly sent to the upstream API.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Change GenerateSearchIndicatorEvents to return [][]byte instead of []sseEvent
for consistency with BuildFallbackTextEvents and other event building functions.
Benefits:
- Consistent API across all event generation functions
- Eliminates intermediate sseEvent type conversion in caller
- Simplifies usage by returning ready-to-send SSE byte slices
This addresses the code quality feedback from PR #226 review.
Align Kiro executor with all other executors (Claude, Gemini, OpenAI,
etc.) by using payloadRequestedModel(opts, req.Model) instead of
req.Model when constructing response model names.
This ensures model aliases are correctly reflected in responses:
- Execute: BuildClaudeResponse + TranslateNonStream
- ExecuteStream: streamToChannel
- handleWebSearchStream: BuildClaudeMessageStartEvent
- handleWebSearch: via executeNonStreamFallback (automatic)
Previously Kiro was the only executor using req.Model directly,
which exposed internal routed names instead of the user's alias.
Consolidate web search handler, SSE event generation, stream analysis,
and MCP HTTP I/O into the executor layer. Merge the separate
kiro_websearch_handler.go back into kiro_executor.go to align with
the single-file-per-executor convention. Translator retains only pure
data types, detection, and payload transformation.
Key changes:
- Move SSE construction (search indicators, fallback text, message_start)
from translator to executor, consistent with streamToChannel pattern
- Move MCP handler (callMcpAPI, setMcpHeaders, fetchToolDescription)
from translator to executor alongside other HTTP I/O
- Reuse applyDynamicFingerprint for MCP UA headers (eliminate duplication)
- Centralize MCP endpoint URL via BuildMcpEndpoint in translator
- Add atomic Set/GetWebSearchDescription for cross-layer tool desc cache
- Thread context.Context through MCP HTTP calls for cancellation support
- Thread usage reporter through all web search API call paths
- Add token expiry pre-check before MCP/GAR calls
- Clean up dead code (GenerateMessageID, webSearchAuthContext fp logic,
ContainsWebSearchTool, StripWebSearchTool)
Add log.Warnf calls to all 7 silent return nil paths so operators can
diagnose why specific antigravity accounts fail to fetch models and get
unregistered without any log trail.
Covers: token errors, request creation failures, context cancellation,
network errors (after exhausting fallback URLs), body read errors,
unexpected HTTP status codes, and missing models field in response.
Sanitize tool schemas by stripping prefill, enumTitles, $id, and patternProperties to prevent Gemini INVALID_ARGUMENT 400 errors, and add unit and executor-level tests to lock in the behavior.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
GitHub Copilot API rejects model names with suffixes (e.g. claude-opus-4.6(medium)).
The OAuthModelAlias resolution correctly maps aliases like 'opus(medium)' to
'claude-opus-4.6(medium)' preserving the suffix, but the executor must strip the
suffix before sending to the upstream API since Copilot only accepts bare model names.
Update normalizeModel in github_copilot_executor to strip suffixes using
thinking.ParseSuffix, matching the pattern used by other executors.
Also add test coverage for:
- OAuthModelAliasChannel github-copilot and kiro channel resolution
- Suffix preservation in alias resolution for github-copilot
- normalizeModel suffix stripping in github_copilot_executor
> Copilot Premium usage significantly amplified when using amp
- Add X-Initiator header (user/agent) based on last message role to
prevent Copilot from billing all requests as premium user-initiated
- Add flattenAssistantContent() to convert assistant content from array
to string, preventing Claude from re-answering all previous prompts
- Align Copilot headers (User-Agent, Editor-Version, Openai-Intent) with
pi-ai reference implementation
Closes#113
Amp-Thread-ID: https://ampcode.com/threads/T-019c392b-736e-7489-a06b-f94f7c75f7c0
Co-authored-by: Amp <amp@ampcode.com>
