OpenClaw Connector Hardening

OpenClaw runtime plugin received three hardening improvements identified by Ant from production patterns: temporal index content previews, type safety and backwards compatibility updates, and a new mid-session checkpoint extraction endpoint for long-lived sessions. The changes are delivered in PR #369.

OpenClaw Connector Hardening Three targeted improvements to the OpenClaw runtime plugin identified by Ant Discord agent from production use patterns. Problem 1 — Temporal Index Content Previews Change: buildSynthesisIndexBlock hooks.ts now appends a summary: <preview line under each temporal index entry, using the existing trimContent node.content, 120 helper. The synthesis prompt’s “do not rewrite” instruction was updated to cover the two-line format. Problem 2 — Type Safety and Backwards Compatibility Change: openclaw-types.ts now mirrors the upstream typed hook interfaces PluginHookAgentContext , PluginHookBeforePromptBuildEvent , etc. with & Record<string, unknown intersections that preserve access to undocumented extra fields from older OpenClaw builds. resolveCtx replaces six ad-hoc field resolution functions with a single dual-source resolver: typed ctx fields preferred, legacy event extras as fallback. Legacy dedup: when both before prompt build and before agent start fire on the same turn without the messages field older OpenClaw , generation counters bpbGen / basGen Maps ensure only one of the pair increments the turn counter. Generation-based tracking avoids the stale-flag problem a Set approach has when before agent start misses a turn. Problem 3 — Mid-Session Extraction for Long-Lived Sessions Change: New POST /api/hooks/session-checkpoint-extract endpoint. The OpenClaw adapter tracks turns per session; after 20 turns it fire-and-forgets a checkpoint extract without releasing the session claim. Delta tracking via session extract cursors table migration 049 in TS daemon, 033 in Rust daemon . The cursor is advanced AFTER enqueueSummaryJob succeeds so a crash causes redundant re-extraction rather than a silent data-loss window. Rust daemon reads cursor and transcript, checks the delta threshold, enqueues a checkpoint extract summary job for the delta, then advances the cursor. Summary job queueing and cursor advancement now match the TS daemon contract: if enqueue fails, the cursor is not advanced and the delta is retried on the next checkpoint attempt. For file-backed checkpoint transcripts, the Rust daemon applies the same guardrail used by its session-end path: transcriptPath must canonicalize under /tmp/signet , point to a regular file, and fit within the transcript size cap before the daemon reads it. Delivered PR 369 ant/openclaw-hardening .