Show HN: Cognition-Claude-proxy – Use Devin model catalog with Claude Code

A developer released Cognition-Claude-proxy, a local proxy that lets Anthropic's Claude Code use Devin's model catalog — including SWE-2, GLM-5.2, and DeepSeek V4.1 Flash — as its backend by translating the Anthropic Messages API to the Connect-RPC format used by the Devin CLI. The proxy runs on port 8765 by default, authenticates via local Devin CLI credentials, and live-syncs models from the upstream catalog with a bundled fallback snapshot of 398 entries. It requires Node.js 18+, an authenticated Devin CLI, and Claude Code, and was verified end-to-end with real claude -p sessions covering text, thinking deltas, and tool calls.

A local proxy that lets Claude Code or any Anthropic-API client use Devin's model catalog — SWE-2, GLM-5.2, DeepSeek V4.1 Flash, and 200+ others — as its backend. It translates the Anthropic Messages API to the Connect-RPC format that the Devin CLI uses, and translates the streaming responses back to Anthropic SSE. php graph LR CC Claude Code -- |POST /v1/messages\nAnthropic JSON| PX Proxy :8765 PX -- |Connect-RPC protobuf\nauthenticated| UP Devin CLI backend\nserver.codeium.com UP -- |streaming events| PX PX -- |Anthropic SSE| CC PX -- |GET /v1/models| UP style PX fill: 4d94ff,stroke: 333,stroke-width:2px style CC fill: e066ff,stroke: 333 style UP fill: 2eb82e,stroke: 333 Plain-text flow php claude ANTHROPIC BASE URL=http://localhost:8765 - POST /v1/messages Anthropic Messages API, JSON - proxy: translate to Connect-RPC protobuf - POST https://server.codeium.com authenticated via local Devin CLI credentials <- Connect server-stream of events text/thinking/tool-call/usage <- Anthropic SSE events message start/content block /message delta The proxy authenticates using your local Devin CLI credentials %APPDATA%\devin\credentials.toml on Windows, ~/.config/devin/credentials.toml on Linux/macOS . No API keys to manage — if devin works, dclaude works. - Node.js https://nodejs.org/ 18+ - Devin CLI https://devin.ai/ installed and authenticated devin command works - Claude Code https://docs.anthropic.com/en/docs/claude-code installed claude command works git clone https://github.com/coderexpert123/cognition-claude-proxy.git cd cognition-claude-proxy Option A: use the wrapper auto-starts the proxy bin\dclaude.bat -p "hello" Option B: start the proxy manually node src/server.js starts on 127.0.0.1:8765 then in another shell: set ANTHROPIC BASE URL=http://localhost:8765 set ANTHROPIC AUTH TOKEN=test claude -p "hello" cd cognition-claude-proxy node src/server.js starts on 127.0.0.1:8765 Then use the wrapper put bin\ on PATH or call directly : bin\dclaude.bat launches claude pointed at the proxy bin\dclaude.bat --model swe-2 pick any model from devin models list bin\dclaude.bat --free free-models-only fallback replaces paid models with free ones Env knobs: CCP PORT default 8765 , CCP API KEY override credential , CCP CREDENTIALS override credentials.toml path , CCP UPSTREAM override backend URL , CCP DEFAULT MODEL default swe-2-high , CCP DEBUG log requests + dump bodies to %TEMP%\ccp- .json , CCP DEBUG SSE dump emitted SSE to %TEMP%\ccp- .log . dclaude.bat maps Claude Code's tier aliases to a pinned model waterfall: | Tier | Alias | Model | Effort | Context | |---|---|---|---|---| | Orchestrate | fable | glm-5-2 | high | 200K | | Deep-plan | opus | deepseek-v4-1-flash-max 1m | max | 1M | | Execute | sonnet | swe-2-max | max | 262K | | Background | haiku | swe-2-medium | medium | 262K | | Verify | explicit | glm-5-2 | high | 200K | --free fallback: replaces the paid deep-plan model deepseek with glm-5-2 ; sonnet/haiku stay on free SWE-2. GET /v1/models live-syncs from the upstream model catalog — the same call devin models list uses — returning every available model with its context window and max output tokens . If the fetch fails it falls back to a bundled snapshot src/models.json , 398 entries . Claude Code decides context accounting client-side. The proxy configures per-model context windows via a claude-settings.json file passed through --settings containing modelPicker rows with 1m suffixes for 1M-context models and behavesAs entries for 200K models. Run node scripts/gen-settings.js to regenerate it from src/models.json . Verified end-to-end with real claude -p sessions: text + thinking deltas, tool calls streamed JSON args , tool results, usage stats, multi-turn agent loops SWE-2 called the Write tool through Claude Code and it executed . MCP tools Playwright, context7, etc. work through the proxy. Not yet handled: images replaced with a text placeholder , prompt caching cache control is stripped , thinking.budget tokens mapping. - The upstream backend runs a pre-inference content filter. Claude Code's system prompt contains phrases that trip it, so the proxy replaces the system prompt with a neutral equivalent sanitizeSystem in src/translate.js . Tool descriptions are also sanitized and capped at 480 chars. If a request fails with permission denied: "content policy" , check the proxy console log and extend the sanitizer. - Cloud MCP connectors Drive, Gmail, Calendar are disabled by Claude Code when a custom ANTHROPIC AUTH TOKEN is set. Local/stdio MCPs work fine. - 1m is the only context suffix Claude Code recognizes — 262k is not parsed and would be sent upstream as part of the model name. permission denied: "content policy" — The upstream content filter rejected something in the request. Check the proxy console log for the upstream error. If Claude Code updated its system prompt with new phrases, extend sanitizeSystem in src/translate.js . permission denied: "MCP configuration issue" — Misleading; this is usually a tool description tripping the content filter, not an actual MCP problem. Check which tool description triggered it and extend sanitizeToolDesc in src/translate.js . Empty response from Claude Code — The proxy is running but Claude Code shows nothing. Ensure the proxy started successfully check http://localhost:8765/health returns {"ok":true} . If it did, run with CCP DEBUG=1 to dump request/response bodies to %TEMP%\ccp- .json . windsurf api key not found — The proxy couldn't find your Devin CLI credentials. Ensure devin works first. Or set CCP API KEY directly. Model not found / wrong context window — Run node scripts/gen-settings.js to regenerate claude-settings.json from the latest src/models.json snapshot. To refresh the snapshot, fetch a live GetCliModelConfigs response and decode it see src/models.js for the field mapping . Proxy port already in use — Set CCP PORT=8766 or any free port before starting the proxy. If using dclaude.bat , set it in the environment before running the wrapper. Upstream API changed — If the backend protocol changes, the proxy will break. The field mappings are in src/codeium.js request encoding and src/translate.js response decoding . Check the proxy console log for decode errors. PRs welcome. node scripts/test.js checks /health and /v1/models