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Yichen Jiang
7e95a00c8a
A max-tokens response that included a tool call persisted assembler-transformed content next to replay metadata projected from the untransformed native message, so the next request died in history reconstruction with INVALID_REPLAY_STATE and the session stayed permanently stuck. Write side: the finish chunk's replayState becomes a typed ReplayEnvelope — opaque response-level metadata plus optional per-block entries aligned with the emitted block sequence. BlockAssembler computes one keep/drop decision for blocks and entries together, so stored metadata always describes stored content and retained blocks keep their signatures. pi-ai splits its state into a version-2 response half and per-block signature entries. Read side: durable content is authoritative. toPiAssistant degrades any unusable state — foreign kind, other versions (including the flat v1 form already on disk), malformed metadata, or content/block mismatches — to the existing provider-neutral conversion with an onReplayDegrade diagnostic instead of failing the request, which un-bricks sessions poisoned before this change. Covered by assembler and replay unit tests, an agent-loop continuation regression, keyless real-composition continuation tests (native pruned-envelope replay and legacy flat-state degrade), and the authored keyless snapshot scenario max-tokens-continue through the assembled ACP app.