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b27551897d
The SessionStart hook injects the most recent *-session.tmp as additionalContext labelled only with 'Previous session summary:'. After a /compact boundary, the model frequently re-executes stale slash-skill invocations it finds inside that summary, re-running ARGUMENTS-bearing skills (e.g. /fw-task-new, /fw-raise-pr) with the last ARGUMENTS they saw. Observed on claude-opus-4-7 with ECC v1.9.0 on a firmware project: after compaction resume, the model spontaneously re-enters the prior skill with stale ARGUMENTS, duplicating GitHub issues, Notion tasks, and branches for work that is already merged. ECC cannot fix Claude Code's skill-state replay across compactions, but it can stop amplifying it. Wrap the injected summary in an explicit HISTORICAL REFERENCE ONLY preamble with a STALE-BY-DEFAULT contract and delimit the block with BEGIN/END markers so the model treats everything inside as frozen reference material. Tests: update the two hooks.test.js cases that asserted on the old 'Previous session summary' literal to assert on the new guard preamble, the STALE-BY-DEFAULT contract, and both delimiters. 219/219 tests pass locally. Tracked at: #1534