feat: anthropic js instrumentation #2261
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cephalization
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Oct 7, 2025
| anthropicInstrumentation.manuallyInstrument(Anthropic.default || Anthropic); | ||
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| async function main() { | ||
| const anthropic = new Anthropic.default({ |
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Bug: Client Instantiation Fails Without Fallback
The Anthropic client is instantiated directly with Anthropic.default. This could cause a runtime error if Anthropic.default is undefined, as the client instantiation doesn't include the fallback used by the instrumentation.
| attributes[ | ||
| `${toolCallIndexPrefix}${SemanticConventions.TOOL_CALL_FUNCTION_ARGUMENTS_JSON}` | ||
| ] = JSON.stringify(part.input); | ||
| } else if (part.type === "tool_result") { |
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Bug: Tool Call Indexing Error
The getAnthropicInputMessageAttributes function incorrectly indexes tool call attributes. It uses the message.content array's index for MESSAGE_TOOL_CALLS instead of a dedicated, sequential index for tool calls, leading to malformed OpenInference attributes.
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resolves #2231
Note
Adds a new JS package that instruments
@anthropic-ai/sdkmessages.create()with OpenTelemetry/OpenInference, including streaming, tool use, token usage, examples, and tests.js/packages/openinference-instrumentation-anthropicsrc/instrumentation.tspatches@anthropic-ai/sdkmessages.create()to emit OpenInference-compliant LLM spans, capturing model, inputs/outputs, tools, and usage; supports both promise and streaming responses.src/index.tsre-exports instrumentation class.package.json,tsconfig*.json,vitest.config.tsset up build, types, and tests.examples/basic-usage.ts,examples/streaming.ts,examples/tool-use.tsshowing setup, streaming, and tool-calling flows.test/instrumentation.test.tscovers enable/disable, custom tracer provider, and trace config.README.mdwith install/quickstart/config andCHANGELOG.mdfor initial release.Written by Cursor Bugbot for commit da65058. This will update automatically on new commits. Configure here.