fix(session-start): eliminate per-subagent re-fire payload bloat (v6.1.2)#46
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…1.2) The SessionStart hook was re-embedding the full ~8 KB using-autodev SKILL.md body on every fire. Codex's run_pending_session_start_hooks was observed firing per subagent spawn -- a single user prompt that dispatched 6+ subagents produced 6+ identical 8 KB blobs in the transcript. Claude Code re-fires the same payload on every compaction. Changes to hooks/session-start: - Emit a ~340-byte pointer instead of the full SKILL.md body. Both Claude Code and Codex discover skills natively via SKILL.md frontmatter, so the body inject was redundant context bloat. - Skip injection when payload contains agent_id. Per both hosts' docs, agent_id is "present only when the hook fires inside a subagent call." agent_type alone is NOT used because Claude Code populates it on top-level `claude --agent <name>` main sessions, which still deserve the pointer. - Per-session_id:source_kind dedup for startup/clear fires. Guards against host re-fire bugs (Codex rapid fires, plugin reload loops, MCP init re-triggers). compact/resume are intentionally NOT deduped so each legitimate lifecycle event still emits its resumption context. - Stale-state wipe rekeyed on session_id transitions rather than the brittle source == "startup" signal. The old signal made re-fires of the same session's startup event repeatedly wipe SEEN_FILE, defeating dedup. Version bump to 6.1.2 in all four manifests (plugin.json, marketplace.json, cursor-plugin/plugin.json) so release-tag workflow auto-tags on merge. Tests: hook-contracts.sh (47 assertions), version-check.sh, skill-content-grep.sh all pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
using-autodevSKILL.md body on every fire. Codex'srun_pending_session_start_hooksfires per subagent spawn (one user prompt dispatching 6+ subagents → 6+ identical 8 KB blobs). Claude Code re-fires on every compact.hooks/session-startnow emits a ~340-byte pointer instead. Both hosts discover skills natively via SKILL.md frontmatter, so re-injecting the body was redundant context bloat.agent_idpopulated) short-circuit to zero-byte output.agent_typealone is NOT used — Claude Code sets it on top-levelclaude --agent <name>main sessions which still deserve the pointer.session_id:source_kinddedup guards against host re-fire bugs forstartup/clear;compact/resumeintentionally not deduped so each legit lifecycle event still emits resumption context.source == "startup"(old signal defeated dedup on re-fires).Test plan
tests/hook-contracts.sh— 47 assertions PASStests/version-check.sh— all four manifests agree on 6.1.2tests/skill-content-grep.sh— host-neutral skill contentagent_idset) → empty output, exit 0claude --agenttop-level (agent_typeonly) → pointer emittedcompact/resume(same session) → resumption context emitted every timesession_idafter dedup → state reset, pointer re-emittedRoot cause references
agent_idis "present only when the hook fires inside a subagent call"agent_idsemanticsrun_pending_session_start_hooksfires per subagent spawn🤖 Generated with Claude Code