Provider connectivity checks and proxy validation are API boundaries, but they kept the user-facing context suffix in the model id while the chat runtime already strips it. Normalize these paths so MiMo-style models with [1m] test the same model that sessions send.
Constraint: [1m]/[2m] are client-side context markers and upstream APIs may reject them
Rejected: Strip suffixes when saving provider config | would change the user-visible model selection instead of only the API boundary
Confidence: high
Scope-risk: narrow
Directive: Keep all provider API boundaries aligned with normalizeModelStringForAPI before sending requests upstream
Tested: bun test src/server/__tests__/providers.test.ts --test-name-pattern "normalizes context-window suffixes"
Tested: bun test src/server/__tests__/providers.test.ts
Tested: bun run check:server
Tested: git diff --check
Not-tested: Live MiMo API call; no provider credential was used
Related: #620
DeepSeek's OpenAI-compatible chat schema accepts text content rather than OpenAI vision content parts, so forwarding Anthropic image blocks as image_url makes the upstream reject the request before the model can answer. Keep normal OpenAI Chat vision behavior as the default, but switch known DeepSeek-compatible chat proxy requests to a text-only conversion that preserves prompt text and replaces image payloads with a small omission marker.
Constraint: DeepSeek official Chat Completions docs list user message content as string text, while its Anthropic compatibility table marks image blocks as not supported.
Rejected: Expand unsupported-image error string matching only | it still surfaces the first turn as an API error and depends on provider wording.
Confidence: high
Scope-risk: narrow
Tested: bun test src/server/__tests__/proxy-transform.test.ts
Tested: bun test src/server/__tests__/providers.test.ts --test-name-pattern "handleProxyRequest|omits image_url"
Tested: bun test src/services/api/errors.test.ts tests/mediaRecoveryAndEstimation.test.ts
Tested: bun run check:server
OpenAI-compatible streaming requests previously used the shared AI request timeout as a full-body AbortSignal. That made long SSE generations stop mid-answer after the configured timeout even when the upstream had already started streaming.
The proxy now applies the configured timeout only while opening streaming upstream requests and keeps non-streaming requests on the existing full-request timeout.
Constraint: The global AI request timeout is documented as covering provider requests and streaming first responses, not total stream duration.
Rejected: Increase the default timeout | long plan-mode answers can still exceed any fixed full-stream limit.
Confidence: high
Scope-risk: narrow
Tested: bun test src/server/__tests__/proxy-network-settings.test.ts
Tested: bun run check:server
Non-stream OpenAI-compatible proxy requests still kept the previous 300s timeout floor after the unified network settings merge. That made lower General AI timeout settings ineffective for normal proxy traffic, even though the setting is meant to be the final provider request timeout.
Constraint: Unified network settings must remain the final timeout and proxy override for provider protocol paths.
Rejected: Keep the 300s non-stream floor | it makes low timeout settings ineffective for normal proxy requests.
Confidence: high
Scope-risk: narrow
Directive: Do not reintroduce per-protocol timeout floors without updating the General network settings contract and tests.
Tested: bun test src/server/__tests__/proxy-network-settings.test.ts
Tested: bun test src/server/__tests__/conversation-service.test.ts src/server/__tests__/network-settings.test.ts src/server/__tests__/providers.test.ts src/server/__tests__/proxy-network-settings.test.ts
Tested: bun run check:coverage
Tested: bun run verify
Not-tested: Live provider request against a real upstream proxy.
The worktree implementation adds one General settings surface for AI request timeout and proxy configuration. This merge keeps main's newer attribution-signing and ChatGPT Official provider paths while preserving the unified network override across CLI sessions, provider checks, and OpenAI-compatible proxy forwarding.
Constraint: Main had newer attribution and official-provider changes touching the same server integration points
Rejected: Prefer the worktree proxy body verbatim | it would drop main's signed CCH attribution wrapper
Rejected: Keep provider preset timeouts above General | it would violate the single timeout control requirement
Confidence: high
Scope-risk: moderate
Directive: General network settings must remain the final AI request timeout and proxy override for every provider protocol
Tested: bun test src/server/__tests__/conversation-service.test.ts src/server/__tests__/network-settings.test.ts src/server/__tests__/providers.test.ts src/server/__tests__/proxy-network-settings.test.ts
Tested: cd desktop && bun run test -- --run src/stores/settingsStore.test.ts src/__tests__/generalSettings.test.tsx
Not-tested: Full bun run verify after resolving main merge conflicts
Settings General now owns AI request timeout and proxy policy so Anthropic-native and OpenAI-compatible provider paths share one user-visible control. The desktop UI persists the network settings, the server proxy and provider checks read them directly, and CLI sessions receive the same timeout/proxy environment.
Constraint: Provider request behavior must be consistent across Anthropic, OpenAI Chat, and OpenAI Responses formats
Rejected: Keep preset API_TIMEOUT_MS precedence | it would make the General timeout control unreliable for some providers
Confidence: high
Scope-risk: moderate
Directive: Do not add protocol-specific AI request timeout controls without preserving General as the final override
Tested: bun test src/server/__tests__/conversation-service.test.ts src/server/__tests__/network-settings.test.ts src/server/__tests__/providers.test.ts src/server/__tests__/proxy-network-settings.test.ts
Tested: cd desktop && bun run test -- --run src/stores/settingsStore.test.ts src/__tests__/generalSettings.test.tsx
Tested: bun run check:desktop
Tested: bun run check:server
Not-tested: socks5 manual proxy support; manual proxy validation currently accepts HTTP/HTTPS URLs only
DeepSeek-compatible OpenAI Chat providers require assistant reasoning_content to be replayed on later tool-call turns when thinking mode is active. The Anthropic-to-OpenAI chat transform now keeps that replay behavior behind an explicit compatibility option, and the proxy only enables it for DeepSeek/OpenCode base URLs so generic OpenAI-compatible providers keep their previous request shape.
Constraint: DeepSeek thinking mode rejects follow-up requests when prior assistant reasoning_content is omitted
Rejected: Trigger compatibility by model name | would affect unrelated OpenAI-compatible providers using DeepSeek model ids
Confidence: high
Scope-risk: narrow
Directive: Do not broaden this compatibility gate without proving other OpenAI-compatible providers accept these non-standard fields
Tested: Fixed-port Web UI harness with copied DeepSeek OpenAI Chat provider reproduced the 400 and passed through local proxy after the fix
Tested: bun test src/server/__tests__/proxy-transform.test.ts
Tested: bun run check:server
Tested: git diff --check
Not-tested: Direct OpenCode Go subscription endpoint, unavailable locally
The desktop model picker now stores a session-scoped provider/model selection instead of relying on the global active provider. That selection is replayed on connect, passed into the CLI startup path, and preserved across turns until the user changes it again.
To make that true end-to-end, the server now restarts the session process when runtime selection changes, injects provider-scoped env for third-party providers, and routes proxy traffic by provider id. The selector UI was also tightened so provider grouping stays visible while the actual model choice remains readable.
Constraint: Different providers can expose the same model id, so chat runtime selection cannot be derived from model id alone
Constraint: A desktop session reuses one CLI subprocess across turns, so runtime changes must restart that process to take effect
Rejected: Keep using Settings active provider as the chat selector | conflates defaults with live session state and breaks overlapping models
Rejected: UI-only runtime switching without server restart | later turns would continue using the old CLI subprocess configuration
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep provider defaults and session runtime overrides separate, and preserve provider-scoped proxy routing when extending model selection surfaces
Tested: cd desktop && bun run lint
Tested: cd desktop && bun run test src/stores/chatStore.test.ts
Tested: cd desktop && bun run test src/__tests__/generalSettings.test.tsx
Tested: bun test src/server/__tests__/conversation-service.test.ts
Tested: bun test src/server/__tests__/conversations.test.ts
Tested: bun -e "await import('./src/server/services/titleService.ts'); await import('./src/server/ws/handler.ts')"
Not-tested: Real third-party provider round-trip from the desktop UI against a live upstream account
Add a protocol-translating reverse proxy that allows using OpenAI-compatible
API providers (DeepSeek, OpenRouter, Groq, etc.) with Claude Code.
The proxy intercepts Anthropic Messages API requests from the CLI, transforms
them to OpenAI Chat Completions or Responses API format, forwards to the
upstream provider, and transforms streaming/non-streaming responses back.
Key features:
- Request transform: Anthropic Messages → OpenAI Chat/Responses
- Response transform: OpenAI → Anthropic (streaming SSE + non-streaming)
- Provider-agnostic reasoning support (reasoning_content, thinking_blocks,
reasoning fields from DeepSeek, OpenAI o-series, GLM-5, Groq, etc.)
- Event queue pattern for correct Anthropic SSE event ordering
- Two-step test: ① connectivity check ② full proxy pipeline validation
- Desktop UI: API format selector, two-step test results display
- License attribution for cc-switch (MIT, Jason Young)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
