fix: Anthropic OAuth compatibility — Claude Code identity fingerprinting - #1597
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Anthropic routes OAuth/subscription requests based on Claude Code's identity markers. Without them, requests get intermittent 500 errors (~25% failure rate observed). This matches what pi-ai (clawdbot) and OpenCode both implement for OAuth compatibility. Changes (OAuth tokens only — API key users unaffected): 1. Headers: user-agent 'claude-cli/2.1.2 (external, cli)' + x-app 'cli' 2. System prompt: prepend 'You are Claude Code, Anthropic's official CLI' 3. System prompt sanitization: replace Hermes/Nous references 4. Tool names: prefix with 'mcp_' (Claude Code convention for non-native tools) 5. Tool name stripping: remove 'mcp_' prefix from response tool calls Before: 9/12 OK, 1 hard fail, 4 needed retries (~25% error rate) After: 16/16 OK, 0 failures, 0 retries (0% error rate)
angelburgosrosado
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Apr 27, 2026
…ing (NousResearch#1597) Anthropic routes OAuth/subscription requests based on Claude Code's identity markers. Without them, requests get intermittent 500 errors (~25% failure rate observed). This matches what pi-ai (clawdbot) and OpenCode both implement for OAuth compatibility. Changes (OAuth tokens only — API key users unaffected): 1. Headers: user-agent 'claude-cli/2.1.2 (external, cli)' + x-app 'cli' 2. System prompt: prepend 'You are Claude Code, Anthropic's official CLI' 3. System prompt sanitization: replace Hermes/Nous references 4. Tool names: prefix with 'mcp_' (Claude Code convention for non-native tools) 5. Tool name stripping: remove 'mcp_' prefix from response tool calls Before: 9/12 OK, 1 hard fail, 4 needed retries (~25% error rate) After: 16/16 OK, 0 failures, 0 retries (0% error rate)
02356abc
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May 14, 2026
…ing (NousResearch#1597) Anthropic routes OAuth/subscription requests based on Claude Code's identity markers. Without them, requests get intermittent 500 errors (~25% failure rate observed). This matches what pi-ai (clawdbot) and OpenCode both implement for OAuth compatibility. Changes (OAuth tokens only — API key users unaffected): 1. Headers: user-agent 'claude-cli/2.1.2 (external, cli)' + x-app 'cli' 2. System prompt: prepend 'You are Claude Code, Anthropic's official CLI' 3. System prompt sanitization: replace Hermes/Nous references 4. Tool names: prefix with 'mcp_' (Claude Code convention for non-native tools) 5. Tool name stripping: remove 'mcp_' prefix from response tool calls Before: 9/12 OK, 1 hard fail, 4 needed retries (~25% error rate) After: 16/16 OK, 0 failures, 0 retries (0% error rate)
melon-xf
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Sep 3, 2026
…ing (NousResearch#1597) Anthropic routes OAuth/subscription requests based on Claude Code's identity markers. Without them, requests get intermittent 500 errors (~25% failure rate observed). This matches what pi-ai (clawdbot) and OpenCode both implement for OAuth compatibility. Changes (OAuth tokens only — API key users unaffected): 1. Headers: user-agent 'claude-cli/2.1.2 (external, cli)' + x-app 'cli' 2. System prompt: prepend 'You are Claude Code, Anthropic's official CLI' 3. System prompt sanitization: replace Hermes/Nous references 4. Tool names: prefix with 'mcp_' (Claude Code convention for non-native tools) 5. Tool name stripping: remove 'mcp_' prefix from response tool calls Before: 9/12 OK, 1 hard fail, 4 needed retries (~25% error rate) After: 16/16 OK, 0 failures, 0 retries (0% error rate)
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Anthropic routes OAuth/subscription requests based on Claude Code identity markers. Without them, requests get intermittent 500 errors (~25% failure rate). Matches pi-ai (clawdbot) and OpenCode implementations.
OAuth-only changes (API key users unaffected):
Before: 9/12 OK, 1 hard fail, 4 retries needed
After: 16/16 OK, 0 failures, 0 retries