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feat(skills): model Agent Skills discovery roots and the SKILL.md spec - #16
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📝 WalkthroughWalkthroughThe pull request adds a ChangesAgent Skills package
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Merge Risk: 🟡 Moderate · up to Callers can corrupt shared root results, while valid Unicode skills and Codex installations using a custom legacy root may not work correctly. These contract defects should be resolved before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 62.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 4 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 6
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@CHANGELOG.md`:
- Line 8: Update the release heading for the 2026-09-17 changelog entry to use
the intended unique SemVer instead of the existing 0.2.0, and preserve
chronological ordering with the existing entries. Determine the replacement
version from the project’s release metadata rather than inferring it from the
changelog alone.
In `@README.md`:
- Around line 337-339: Add the missing github.com/sageox/agentx import to the
README Go example’s import block so agentx.AgentTypeCursor resolves, while
preserving the existing skills import and snippet behavior.
In `@skills/roots.go`:
- Around line 131-132: Update the lookup flow that assigns roots from
byScope[scope] to clone roots.Read before returning roots, ensuring callers
cannot mutate the global registry through the returned slice while preserving
the existing roots and ok values.
- Line 76: Update the Codex personal-root handling around ScopePersonal and
RootsFor so the legacy root resolves from CODEX_HOME, falling back to its
default when unset, instead of using a fixed ~/.codex/skills path. Ensure the
resolved legacy root is included for both reading and cleanup while preserving
CanonicalPersonal as the current root.
In `@skills/spec.go`:
- Around line 76-96: Update name validation around invalidNameReason to
normalize names with Unicode NFKC before checking them, permit Unicode lowercase
alphanumeric characters, and count Unicode code points for the name length
limit. Replace byte-based length checks for Description and Compatibility with
rune counts while preserving the existing validation messages and limits.
- Around line 135-142: The frontmatter parser must recognize only a complete
delimiter line equal to "---". Update the parsing logic around the existing
frontmatter extraction to process normalized input by lines, preserve an empty
body for "---\n---\n", and reject unterminated frontmatter or lines such as
"---invalid" as closing fences.
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CHANGELOG.mdREADME.mdgo.modskills/roots.goskills/roots_test.goskills/spec.goskills/spec_test.go
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…ce, isolate returned roots
Install a team's skill once and every AI coworker finds it — instead of a maintainer hand-copying it into
.claude/skills,.cursor/skills,.factory/skillsand five more, then keeping all eight in sync forever.Agent Skills stopped being a Claude Code feature. The format was released as an open standard in December 2025, is now stewarded by the Agentic AI Foundation at agentskills.io, and has ~45 client products. agentx had no concept of skills at all — the only occurrence of the word in the Go tree was a comment folding Amp's skills into
CustomCommands. So every consumer had to hand-maintain each vendor's directory layout, and quietly installed nothing for the agents it hadn't gotten to.What this ships
skills.RootsFor(agent, scope)→Roots{Write, Read}for 12 agents at project and personal scope.skills.ParseManifest/Manifest.Validate— theSKILL.mdformat, with every violation reported in one pass.TestEveryRegisteredAgentIsClassified— the anti-rot gate agentx has never had for a capability table.The one-root rule
The ecosystem converged on
.agents/skills, so a skill installed once is found by nearly every agent.Writeis the single directory to install into.Readis for discovery and cleanup only — finding a skill a user placed by hand, or a copy left by an older layout.flowchart LR S["one SKILL.md"] --> W{"skills.RootsFor"} W -->|"Write"| C[".agents/skills/"] W -->|"Write"| CC[".claude/skills/"] W -->|"Write"| K[".kiro/skills/"] C --> A["Codex · Gemini · Cursor · Copilot<br/>Droid · OpenCode · Amp · Goose · pi · OMP"] CC --> B["Claude Code"] K --> D["Kiro"] style C fill:#1b4332,stroke:#2d6a4f,color:#fffFanning one skill across each vendor's native directory puts the same file on disk several times — several things to keep in sync, several things in a diff, and several answers when they disagree.
.claude/skills(upstream request); Kiro only.kiro/skills. Both get their native directory asWrite. A test names them, so an agent gaining canonical support upstream shows up as a failing test rather than as a permanently duplicated install.ok == falsemeans install nothing, rather than guessing a directory. Six agents and all four orchestrators are recorded as deliberately unsupported, with a reason each.Two deliberate omissions
SkillsManager. Skills are directory bundles, and consumers that install them already own digest tracking, retirement and conflict handling for their whole managed inventory. A second installer here would be a parallel mechanism that drifts from the first. Worth noting the existingBaseRulesManagercould not have been reused anyway — it is file-flat and its uninstall path skips directories, so it is structurally incapable of removing a bundle.Capabilities.Skillsflag.RootsForreturningok == falsealready answers it. Adding the boolean means touching all ~20 agent implementations plus the comprehensive test table to carry information the table already holds.Why the conformance test matters more than the table
agentx has no invariant tying any capability table back to the registry. That is how
agents/register.gocan omit Cline and Droid while staying green, and howconfig/paths.godrifted to 9-of-17 coverage. Adding an agent now fails the suite until somebody records where its skills go — or records that it has none, with a reason.Red-first, both gates:
TestEveryRegisteredAgentIsClassifiedrootsByAgentamp is registered but unclassified: add it to rootsByAgent, or to deliberatelyUnsupported with a reasonTestWritePrefersTheCanonicalRoot.cursor/skillscursor must install into the canonical project root, not a native oneBoth restored, both green.
Sourcing
Every path came from the vendor's own documentation, not from a search summary or a secondary aggregator — Anthropic, OpenAI, Cursor, GitHub, Factory, OpenCode, Amp, Gemini CLI, Goose, pi, Kiro. Where an earlier draft relied on a weaker source (Gemini and Goose), the vendor page was fetched before the entry was written; both turned out to read the canonical root at project scope.
Test Plan
make check(fmt + lint + test) — 1196 tests pass, 2 pre-existing skipsgo test ./skills/ -cover— 100.0% of statementsgopkg.in/yaml.v3promoted from indirect to direct; it was already in the module graph via testify, so no new module is downloadedFollow-ups, not in this PR
agentx/pkg. Left alone deliberately.rules.Config.AlwaysApplyFieldis declared but never read by the content builder.Need help on this PR? Tag
@codesmith-botwith what you need. Autofix is disabled.Summary by CodeRabbit
New Features
SKILL.mdmanifests, including required fields, naming rules, and metadata.Documentation