The knowledge base was frozen at ~v2.1.111, describing an Opus-4.7 world
after CC shipped Opus 4.8 and Fable 5. Refreshed three agent-facing
knowledge files; every fact re-verified against the official changelog
(~/.claude/cache/changelog.md, CC 2.1.181) on 2026-06-18.
- feature-evolution.md: new Opus-4.8-era rows above the v2.1.111 freeze --
Opus 4.8 default + /effort xhigh (2.1.154), Fable 5 Mythos-class
(2.1.170), post-session hook (2.1.169), MessageDisplay (2.1.152),
/simplify -> /code-review (2.1.147), /config key=value (2.1.181).
- hook-events-reference.md: 26 -> 28 events (+MessageDisplay, +post-session);
documented Stop/SubagentStop additionalContext output field.
- claude-code-capabilities.md: 2026-06 model/effort lineup table;
bundled skills /simplify -> /code-review; documented /config key=value.
- cc-2.1.x-changelog-delta.md: marked SUPERSEDED by the gap-matrix.
Verification caught two version errors in STATE/matrix, corrected to the
changelog:
- Stop/SubagentStop additionalContext is 2.1.163, not 2.1.165 (2.1.165 was
"Bug fixes" only; matrix row 109 already said 2.1.163).
- settings `agent` field introduced 2.0.59; 2.1.157 = honored for
dispatched `claude agents` sessions, not the introduction.
New tests/knowledge/knowledge-staleness.test.mjs (8 tests) encodes the
verified facts as a re-freeze guard (RED before edits, GREEN after).
Full suite: 850/850 green (+8). self-audit PASS, A(100)/A(97).
Add 2026-04 deltas (v2.1.83-v2.1.111) verified against
research/03-claude-code-changes-config-surfaces.md (2026-04-19):
- Opus 4.7 + token-efficiency surfaces (env vars, attribution.commit/pr)
- Sandbox isolation (sandbox.* keys)
- Managed-only enterprise lockdown flags
- disableSkillShellExecution (v2.1.91)
- forceRemoteSettingsRefresh (v2.1.92)
No new hook events in this range — noted in hook-events-reference.md.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add /ultraresearch-local for structured research combining local codebase
analysis with external knowledge via parallel agent swarms. Produces research
briefs with triangulation, confidence ratings, and source quality assessment.
New command: /ultraresearch-local with modes --quick, --local, --external, --fg.
New agents: research-orchestrator (opus), docs-researcher, community-researcher,
security-researcher, contrarian-researcher, gemini-bridge (all sonnet).
New template: research-brief-template.md.
Integration: --research flag in /ultraplan-local accepts pre-built research
briefs (up to 3), enriches the interview and exploration phases. Planning
orchestrator cross-references brief findings during synthesis.
Design principle: Context Engineering — right information to right agent at
right time. Research briefs are structured artifacts in the pipeline:
ultraresearch → brief → ultraplan --research → plan → ultraexecute.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
