fx

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fx

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Identity

• Names: com.vercel.fx; short alias fx.
• Native format: fx-event-log-v3: authority.json, events.jsonl, commit.<log_generation>.json. Session-manifest schema 3 differs from event-envelope schema 1.
• Session ID: authority.session_id, checked against session_started.payload.id and commit watermark session_id. The native timestamp/nanosecond/random ID needs no namespace.
• Commit contract: Validate generation, framing, contiguous native sequence, terminal event ID and exact committed-byte watermark. Bytes after the watermark are not events or gaps. Defer capture while pending markers are present. Validate and project the same unchanged bytes, then recheck sidecars. The pinned reducer verifies replacement chunk IDs/order/lengths/checksums and final state identity.
• Notes: Committed events retain sequence order; canonical history/current state follow as snapshots. Compacted summaries have unknown extent. Keep numeric signals raw and non-UTF8 bytes native with an explicit content loss. Model preferences and permission rules are configuration, not served-model or approval-request evidence. Inspect marked secret answers in every decoded replacement, including superseded states; exclude encoded secret-bearing chunks too.

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Position basis

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Destinations

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fx: native facts without a standard field

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Links

• Entity keys and links: Audit identity derives from (log_generation, event_id, projection slot). The pinned reducer appends one turn per history_turn_committed and replaces history at state_replacement_committed. Appended-turn identity derives from its event; replacement turns use capture-scoped positions. Native tool IDs join result tool_call_id only when unique. Work IDs and recovery counts are not turn IDs.
• Lineage: Directory containment and last_subagent_work_id do not qualify child identity, parent, fork, copies or root.

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Usage

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Lane and unassigned facts

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Losses

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Evidence

{
  "name": "com.vercel.fx",
  "aliases": [
    "fx"
  ],
  "namespace": {
    "rule": "none"
  },
  "positions": [
    {
      "family": "events",
      "basis": "generation-and-sequence",
      "boundary": "through_event_log_bytes"
    },
    {
      "family": "replacement-history",
      "basis": "array-index",
      "boundary": "through_event_log_bytes"
    }
  ],
  "formats": [
    {
      "id": "fx-event-log-v3",
      "evidence": [
        0,
        2
      ]
    }
  ],
  "evidence": [
    {
      "label": "source",
      "revision": "79666393e5f613c85f2f0b4b65475f1addd55379",
      "scope": "format-and-explicit-mappings"
    },
    {
      "label": "authored",
      "scope": "converter-tests-only"
    },
    {
      "label": "capture",
      "version": "0.0.6",
      "scope": "schema 3 transactional tool-free and read-file sessions"
    }
  ],
  "destinations": {}
}