Claude Code 2.1.218 changed /deep-research to start only when invoked
manually; from there the Skill tool refuses a model invocation outright
with `disable-model-invocation` (measured in a real `--engine deep-research`
run 2026-09-01 18:32Z - the SC3 fallback to swarm held). The engine was
built against 2.1.196 and the prose still promised a path Claude Code has
removed ("requires Claude Code 2.1.154+").
The flag is KEPT as an additive opt-in that never hard-fails. Prose only:
no lib/ change, no adapter-contract change, no default change, no version
bump.
- commands/trekresearch.md: flag bullet states the closed window
`2.1.154 <= CC < 2.1.218`; the pre-gate gained an UPPER ceiling (still a
numeric comparison, not a string one) that skips straight to the fallback
with reason `disable-model-invocation`; step 3 names the Skill-tool
refusal as a known failure manifestation; step 4 lists the reason tokens.
- docs/command-modes.md + README.md: same window, one sentence each, on the
reference row itself.
- CHANGELOG.md: Unreleased/Docs entry.
Tests first (Iron Law): tests/lib/doc-consistency.test.mjs gained a pin
requiring 2.1.218 + disable-model-invocation on all three surfaces, on both
reference rows, and in both load-bearing regions of the command (flag
bullet + pre-gate). Seen red on all three surfaces before the prose change.
tests/commands/trekresearch-engine.test.mjs unchanged and green.
New baseline: 1024 tests, 1022 pass / 0 fail / 2 skip (was 1023: 1021/0/2).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Kjell Tore Guttormsen
4e5523fb0a