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feat(api): cursor fingerprinting — CURSOR_STALE (policy R5) #249

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Merged
Levalicious merged 1 commit into from
Oct 8, 2026
Merged

feat(api): cursor fingerprinting — CURSOR_STALE (policy R5) #249

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13 changes: 9 additions & 4 deletions docs/api-error-policy.md
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Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,9 @@ Every failure the caller can act on is returned as a tool-level error:

Stable codes: `ENTITY_NOT_FOUND`, `TYPE_NOT_FOUND`, `ENDPOINT_MISSING`,
`COLLISION`, `LIMIT_EXCEEDED`, `INVALID_REGEX`, `INVALID_FILE`,
`NO_MATCHES`, `VALIDATION_FAILED`. JSON-RPC protocol errors are reserved for
genuine server faults and are never used for caller-actionable failures.
`NO_MATCHES`, `CURSOR_STALE`, `VALIDATION_FAILED`. JSON-RPC protocol errors
are reserved for genuine server faults and are never used for
caller-actionable failures.

**R2 — Validate-first, atomic.**
A mutation validates the entire request under the write lock before touching
Expand Down Expand Up @@ -84,10 +85,14 @@ faults; Q1 = atomic-fail on missing endpoints; Q2/Q3 = error.
(drops→errors: `ENDPOINT_MISSING`, all-missing `open_nodes`,
`TYPE_NOT_FOUND`, unknown starts), `INVALID_FILE`, `INVALID_REGEX`,
`NO_MATCHES` envelope.
- **Ledger PR:** R3 result ledgers + report fields
- **Ledger PR (#248, merged):** R3 result ledgers + report fields
(`created`/`existing`/`skippedDuplicates`/`notFound`/`alreadyPresent`,
`open_nodes.missing[]`, `random_walk.modeUsed`/`fallbackSteps`,
`sequentialthinking.linkedTo`).
- **Next:** R5 cursor fingerprinting (`CURSOR_STALE`).
- **Cursor PR (this change):** R5 — cursors are `<index>:<fnv32(result set)>`;
any change to the set between pages → visible `CURSOR_STALE`; malformed
cursors rejected; bare-number cursors accepted as legacy (unchecked).
Prerequisite shipped in the same change: all sort tie-breaks are
deterministic (name), so result sets have a stable total order.
- **v4 line (`feat/libsegstore`):** inherits this policy at reconciliation;
kbd4's batch=txn=commit model is the natural home for R2 atomicity.
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