Fix: route ANTHROPIC_LOG=debug output to stderr#235
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joaquinhuigomez wants to merge 1 commit intoanthropics:mainfrom
Open
Fix: route ANTHROPIC_LOG=debug output to stderr#235joaquinhuigomez wants to merge 1 commit intoanthropics:mainfrom
joaquinhuigomez wants to merge 1 commit intoanthropics:mainfrom
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When ANTHROPIC_LOG=debug is set, the Anthropic HTTP client logs debug output via console.log(), which writes to stdout. This corrupts the JSON protocol used for parent-child process communication in the SDK. The fix: replace the default `console` logger with a stderr-based logger when the client runs inside the SDK subprocess. The logger interface (log, warn, error) is preserved but all output routes to process.stderr instead of process.stdout. Affected code in the Anthropic client constructor (cli.js): BEFORE: this.logger = options.logger ?? console AFTER: this.logger = options.logger ?? stderrLogger Includes a test that verifies debug logging does not leak to stdout. Fixes anthropics#157
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