fix: thinking-block continuity on non-Anthropic backends - #24
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BenSheridanEdwards wants to merge 2 commits into
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fix: thinking-block continuity on non-Anthropic backends#24BenSheridanEdwards wants to merge 2 commits into
BenSheridanEdwards wants to merge 2 commits into
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DeepSeek's anthropic-compat endpoint 400s with:
The \`content[].thinking\` in the thinking mode must be passed back to
the API.
…when the request body has \`thinking: { type: \"enabled\", ... }\` at
the top level but the messages don't carry thinking content blocks.
Background: foreign-backend thinking blocks are invalid against
Anthropic's signing key, so the proxy strips them from messages on
isModelCall. But it left the top-level \`thinking\` config in place,
creating the contradictory state DeepSeek rejects.
Fix: drop both \`thinking\` and \`context_management\` for isModelCall
routes (mirrors what the image-fallback path on PR aattaran#21 already does on
forceAnthropicForImage). Backends like DeepSeek don't honor Anthropic's
extended-thinking config anyway, so dropping it costs nothing and
fixes the 400.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…inuity Previous attempt dropped only the top-level \`thinking\` config; the 400 still fires because DeepSeek's check is on \`content[].thinking\` inside messages — it expects its own prior thinking blocks to be passed back verbatim for conversation continuity. The original strip was added to clean up foreign-backend blocks on backend switches (commit 70518b6), but it also removes DeepSeek's own blocks in pure-DeepSeek sessions, breaking continuity. For now: leave thinking blocks in place on isModelCall so DeepSeek can see its own history. We continue to drop the top-level thinking config since non-Anthropic backends don't honor Anthropic's extended-thinking spec consistently. Backend-switch case (DeepSeek session → Anthropic) is still handled by the Anthropic-side strip (\`hadNonAnthropicSession ? stripAllThinkingBlocks : stripUnsignedThinkingBlocks\`), which shouldn't regress. If a future user reports a foreign-block 400 going INTO DeepSeek (e.g. switching mid-session from openrouter to deepseek), we'll need a finer-grained strip that distinguishes block origin. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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…parity Summary of fixes and features applied from aattaran/deepclaude issues and PRs, plus original improvements: Model coverage (Issue aattaran#39): - Add claude-fable-5, claude-opus-5, claude-sonnet-5 to MODEL_REMAP - Tier-based _default fallback (fable/opus/sonnet/haiku) so new Claude models degrade predictably instead of silently routing to the wrong backend - Warning log when model is forwarded unmapped Proxy resilience (PR aattaran#18): - proxyRes error handler — upstream TCP reset mid-response no longer crashes the entire proxy process - proxyReq error after headers-sent: destroy response instead of injecting JSON into the SSE stream (which corrupted the parser) Thinking-block continuity (PR aattaran#24): - Drop top-level thinking/context_management on non-Anthropic routes instead of stripping all thinking blocks from history - Fixes DeepSeek 400: "content[].thinking must be passed back" Proxy in normal mode (PR aattaran#9): - Default launch now starts the proxy; cost tracking and live /switch work in all sessions, not just --remote - Use ANTHROPIC_API_KEY instead of ANTHROPIC_AUTH_TOKEN so subscription OAuth tokens are handled correctly Body size limit (PR aattaran#7): - 50 MB cap on /v1/messages request body, returns 413 Forward unknown args to claude (Issue aattaran#25): - Bash: -- separator support for explicit passthrough - PowerShell: ValueFromRemainingArguments captures unknown flags PowerShell parity (PR aattaran#5, aattaran#8): - --switch/-s parameter with backend name normalization - try/finally ensures proxy cleanup on Ctrl+C/crash Model [1m] suffix: - All model names include [1m] token window hint so Claude Code doesn't assume 200k context and auto-compact prematurely Project documentation: - CLAUDE.md with architecture overview, proxy routing, SSE normalization, model remapping, and development conventions
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DeepSeek's anthropic-compat endpoint returns 400 mid-conversation:
…once Claude Code emits a thinking block in any assistant turn. The proxy was both stripping all thinking blocks from messages AND leaving the top-level
thinking: { type: "enabled", ... }field in the request body, creating a contradictory state DeepSeek rejects.Two fixes in this PR:
1. Drop top-level
thinkingandcontext_managementon non-Anthropic routes. Backends like DeepSeek don't honor Anthropic's extended-thinking spec consistently, and a stale config field is a noisier error than no config at all.2. Stop stripping thinking blocks on
isModelCall. The original strip from commit 70518b6 was added to clean up foreign-backend blocks on backend switches — but it's too broad for pure-DeepSeek sessions, where DeepSeek's own prior thinking blocks are valid and required for continuity. Removing the strip unblocks the conversation.Backend-switch case (e.g. DeepSeek session → Anthropic) is still handled by the Anthropic-side strip (
hadNonAnthropicSession ? stripAllThinkingBlocks : stripUnsignedThinkingBlocks), which doesn't change in this PR.Test plan
deepclaude(default mode, DeepSeek): multiple turns including tool use, no 400s.Notes
This bug also affects
feat/cost-statusline(#23) and any branch that descends from main while keeping the original strip. Both fixes are also present on #23 by virtue of being committed there first; when one PR merges, the other's rebase will recognise the duplicate patches and drop them.