fix(anthropic): bump forged Claude Code pin to 2.1.280 - #168
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Anthropic rejects opus-5-5 (and newer models) unless the Claude Code client is 2.1.280 or newer. Native passthrough was forwarding old UAs such as 2.1.209 unchanged, which 400'd the request. Raise the forged pin to npm's current 2.1.280. Callers below the pin are rewritten onto that version; current or newer official CLIs still passthrough so prompt cache stays intact.
Native Claude Code detection now requires UA >= 2.1.280. Tests still using 2.1.236 were skipped for anyrouter fallback-tool injection.
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Anthropic now returns:
for
claude-opus-5-5(also seen with 2.1.278). The forged pin was still2.1.258, and native Claude Code passthrough forwarded the caller UA unchanged, so old CLIs 400'd.npm
@anthropic-ai/claude-codelatest is2.1.280.Changes
anthropicCLIVersion2.1.258→2.1.280cc_versionto 2.1.280Test plan
go test ./internal/app -run AnthropicClientVersion|AnthropicWireGolden|ValidAnthropicClaudeCLIUserAgent|AnthropicOAuthPreservesNative|AnthropicNativeClaudeCodeclaude-cli/2.1.209UA no longer 400s on version