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The Headroom guardrail sent every message to /v1/compress, including the system prompt and the user's current instruction. On an agentic /v1/messages request the live turn is the largest compressible blob, so it came back as a hash marker; the model then called headroom_retrieve and got its own instruction returned in a tool_result block, which reads as data it fetched rather than a request to act on, so it described the content instead of doing the work. litellm already owns the policy for what a compressor may never rewrite: get_protected_indices covers the system rows, the last user row and the last assistant row, and compress() expands it over whole tool exchanges. Headroom now consults it (promoted from a private name and given tests) and expands it the same way, so the trailing tool result cannot come back as a marker standing in for the result of the call the model just made. Protected rows are withheld from the payload rather than pinned afterwards, so their tokens are not reported as savings that are never applied; the write-back discards a compressed system prompt outright, so that saving never existed. The cost is that a query-aware service no longer sees the newest user message. A response whose row count differs from what was sent can no longer be interleaved with the withheld rows, so it goes through the configured fail policy instead of being adopted. Fail-open now returns the caller's own inputs object: translation handlers detect a rewrite by identity, so a rebuilt copy sent an unchanged request through the Anthropic write-back for nothing. That write-back rebuilt the request with one anthropic_messages_pt call, which merges every run of consecutive user/tool rows, so a tool_result turn and the user turn after it arrived fused. Converting a row at a time would separate them but breaks tool pairing: with modify_params on, an assistant row whose results are converted separately reads as an orphaned tool call and the sanitizer answers it with a synthetic "tool execution skipped" result while dropping the real one. Conversion is now grouped by tool_call_id ownership, which satisfies both, and the same grouping decides which rows headroom protects, so the two agree by construction. The CCR follow-up also dropped any text the model wrote alongside its tool call, and echoed tool calls it had no results for. Both are fixed by reusing compresr's extraction helper, now shared instead of duplicated. Resolves LIT-5018 |
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