docs(sdk): document per-call prompt token composition metrics - #757
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docs(sdk): document per-call prompt token composition metrics#757georgeglarson wants to merge 4 commits into
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Companion to the PromptComposition feature on software-agent-sdk feat/llm-prompt-composition-metrics: per-call decomposition of prompt tokens into system prompt, tool schemas, conversation history, and latest message, recorded in LLM Metrics. Co-authored-by: openhands <openhands@all-hands.dev>
Address review findings: join compositions to token usage by response_id instead of positionally, qualify tool_tokens > 0 as native-FC agent steps (mock-tools renders schemas into prompt text), note litellm's tool serialization convention and fallback tokenizer, and document the linear-in-prompt-size counting cost. Co-authored-by: openhands <openhands@all-hands.dev>
Mirrors the SDK docstring caveat (OpenHands/software-agent-sdk#4623): subscription mode folds the system prompt into the first user message, so those tokens count as history/latest on that transport. Co-authored-by: openhands <openhands@all-hands.dev>
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Address rajshah4's review on software-agent-sdk#4623: composition recording is now opt-in (default off), so the page leads with enabling the flag and examples show it; the metrics field list notes the gate. Co-authored-by: openhands <openhands@all-hands.dev>
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August 25, 2026 08:00
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Summary of changes
Companion documentation for the prompt token composition metrics feature (SDK PR OpenHands/software-agent-sdk#4623).
sdk/guides/llm-prompt-composition.mdx: documents the per-callPromptCompositionrecord onMetrics(system prompt / tool schemas / conversation history / latest message), how to join records to provider-reported usage byresponse_id, the estimates-vs-authoritative-usage contract, and the always-on counting cost.sdk/guides/metrics.mdx: addsprompt_compositionsto the Metrics field list and a Next Steps link.docs.json: registers the page under SDK → Guides → LLM Features.Validation:
npx mint broken-linksreports no broken links.