feat(core): M4 — skills + sub-agents + output styles loaders#5
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Implements docs/DEVELOPMENT_PLAN.md §3.13 / §3.13a / §3.13b loaders.
Shipped
-------
- skills/frontmatter.ts (115 lines)
Zero-dep YAML frontmatter parser supporting the subset SKILL.md / sub-agent /
output-style files actually use: strings (quoted or bare), numbers, booleans,
flow-style arrays ["a","b"], block-style arrays, simple block objects.
- skills/loader.ts (110 lines)
4-layer loader: builtin (compiled-in dir) / user (~/.deepcode/skills/) /
project (<cwd>/.deepcode/skills/) / plugin (<plugin>/skills/, name prefixed
with `<plugin>:`). Honors `disabled: true` in frontmatter + settings.json
`skillOverrides[name].disabled`. `buildSkillsDescriptionBlock()` produces
the system-prompt fragment listing name+description (body loaded on invoke).
- sub-agents/loader.ts (75 lines)
Loads .deepcode/agents/*.md. Frontmatter spec: name / description / tools[] /
model / isolation (subprocess|worktree|none) / maxTurns. Supports CLI
--agents <dir> override via projectDirOverride option. findSubAgent() helper.
- output-styles/loader.ts (105 lines)
4 built-in styles (default / explanatory / learning / proactive) from
§3.13b. User → project layer replacement semantics. applyStyle(base, style)
appends body to system prompt; respects keep-coding-instructions frontmatter.
Top-level @deepcode/core re-exports all M4 surfaces.
Tests
-----
- frontmatter.test.ts (10) — quoted strings, booleans, numbers, both array
styles, block objects, comments, malformed
- loader.test.ts ( 9) — user/project sources, plugin qualification,
tools/effort/model frontmatter, disabled filter,
malformed skip, override gate
- sub-agents/loader.test.ts ( 6) — all frontmatter fields, layer ordering,
projectDirOverride, findSubAgent
- output-styles/loader.test.ts (9) — 4 builtins, user override displaces
builtin, project displaces user,
applyStyle composition
Total: 240 passed / 4 skipped / 0 failed (was 206).
Deferred
--------
- 15 built-in skill markdown FILES (loader finds whatever's on disk; content
authoring is out-of-band, not engineering work).
- `Skill` tool for invocation (M5 — will inject skill body into next turn's
system messages).
- REPL plumbing for skill-frontmatter effort overrides (paired with Skill tool).
- `auto` classifier mode (M3c).
Verified
--------
pnpm typecheck → green
pnpm test → 240 passed / 4 skipped
pnpm format:check → conformant
Docs
----
- docs/milestones/M4.md — delivery report + deferred items
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Skilltool for invocation in M5.Release notes
release-notes:featureCo-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com