Fix skill discovery inside a symlinked container directory

[p12tic]

Related GitHub Issue

Closes: #1842

Description

When .roo/skills (or a subdirectory within it) is a symlink to an external directory that contains skill subdirectories rather than a single skill, Roo Code fails to discover the skills inside it. Only directories that directly contain a SKILL.md are recognized, so a symlinked "container" of multiple skills is skipped.

Test Procedure

Have this directory structure:

/shared-repo/skills/                 # actual directory containing multiple skills
/shared-repo/skills/skill-a/SKILL.md
/shared-repo/skills/skill-b/SKILL.md
/project/.roo/skills/skills -> /shared-repo/skills   # symlinked container of skills

Start Roo Code in /project.
Open the skills list / trigger skill discovery.

skill-a and skill-b are discovered and available.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• [n/a] Visual Snapshot (UI changes only): If a user would notice this change at a glance (layout, theme tokens, brand elements, empty/error states), I've added or updated a *.visual.tsx snapshot in webview-ui/. See webview-ui/AGENTS.md → "When a UI change needs a snapshot".
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

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Videos (interaction / animation only)

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Documentation Updates

Does this PR necessitate updates to user-facing documentation?

• No documentation updates are required.
• Yes, documentation updates are required. (Please describe what needs to be updated or link to a PR in the docs repository).

Additional Notes

n/a

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🔇 Additional comments (4)

src/services/skills/SkillsManager.ts (2)

649-701: LGTM!

---

703-730: LGTM!

src/services/skills/__tests__/SkillsManager.spec.ts (2)

17-21: LGTM!

Also applies to: 57-58, 69-70

---

2357-2608: LGTM!

---

📝 Summary

Summary by CodeRabbit

• New Features
  • Skill discovery now includes skills in nested directories and linked folders, scanning up to five levels deep. Shallower matches take precedence within a location, and configured locations are checked in order.
  • Scans avoid revisiting the same directory, and broken links no longer prevent discovery of valid skills nearby.
• Bug Fixes
  • Creating a skill is blocked when a matching skill already exists in the destination’s .roo location. A match in .agents still allows creating a .roo skill.
  • Moving a nested skill uses its discovered location and works across filesystems. Empty source folders are removed only when it is safe to do so.

Walkthrough

The skills manager scans nested and symlinked containers to depth five. It resolves same-root duplicate skill identities by depth and sorted entry order. Creation checks discovered skills for duplicates. Moves use discovered paths and handle cross-device rename errors.

Changes

Skill discovery and operations

Layer / File(s)	Summary
Recursive scanning and discovery src/services/skills/SkillsManager.ts, src/services/skills/__tests__/SkillsManager.spec.ts	The scanner follows nested and symlinked containers, skips previously visited real paths within each root, and applies depth-based collision handling. Tests cover scan depth, ordering, symlink deduplication, and broken symlinks.
Discovered-skill duplicate checks src/services/skills/SkillsManager.ts, src/services/skills/__tests__/SkillsManager.spec.ts	Creation rejects a matching discovered skill when its tracked root is within the destination .roo base directory. Tests cover nested duplicates and matching skills found only in .agents.
Moves and safe source cleanup src/services/skills/SkillsManager.ts, src/services/skills/__tests__/SkillsManager.spec.ts	Moves use the discovered directory. On EXDEV, the manager copies the directory to a staging location and promotes it by rename. Failed copies or promotions clean up staging. Cleanup removes an empty parent only when it passes the path-safety check.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~30 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: hannesrudolph

Merge Risk: 🔵 Low · up to b948e

Most nested-skill workflows are ready to merge. A shallow symlink alias can occasionally miss a skill, and an interrupted cross-device move may need manual cleanup before retrying; these are bounded risks for the owner to accept or address.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to b948e

Skills found in shared directories can now be moved from their actual external locations. The distinction between discovering shared skills and owning them is not explicit. Cross-device moves also have a failure window that can leave a destination copy behind while reporting failure and preventing an ordinary retry.

Retained concerns

• Medium · security · inferred: Newly discovered skills in symlinked containers inherit mutation authority: moving a skill can rename or copy-and-remove its actual external directory, and existing delete and mode-update operations also consume its discovered path. Discovery provenance does not distinguish shared read access from ownership. External movement is explicitly tested, but whether every discoverable shared skill should be destructively manageable remains unresolved.
• Medium · reliability · observed: The new cross-device move commits the destination before recursively removing the source. If removal fails, the destination remains, the source may remain or be partially removed, and registry refresh is skipped. When the source skill remains registered, an ordinary retry rejects the existing destination instead of resuming cleanup. This weakens failure containment and leaves ownership transfer incomplete.

Security review details

Security Blast Radius

• inferred — The directly exposed assets are accepted skill files and selected skill-directory subtrees reachable through configured global or project roots, including external container targets. Mutations use the extension process's filesystem permissions. A writable shared skill directory can therefore be affected beyond the initiating workspace; no additional privilege gain is established.

Security Findings and Attack Paths

• inferred — A party able to modify a scanned container or its symlink routing can influence which valid external skills enter the registry. A subsequent management request for a selected identity can mutate the corresponding external skill. This is a conditional ownership-confusion path, not an established automatic exploit: filesystem permissions, valid metadata, identity selection, and a management action remain necessary.

Trust Boundaries and Controls

• observed — External skill access predates this PR: base discovery followed symlinked roots and skill entries, and base deletion already used the stored path. Head deliberately extends this model to containers. Depth bounds, metadata validation, identity precedence, destination checks, and parent-cleanup checks constrain behavior but do not distinguish shared discovery from destructive ownership.

Resilience and Maintainability Implications

• inferred — Failure or interruption between destination promotion and source removal can leave two independently discoverable copies or a partially removed source. Without resumable completion semantics, a retry may be blocked and manual reconciliation may be needed to restore clear skill ownership and mode placement.

Hardening Proposals

• proposed — Define whether externally discovered skills are shared read-only resources or owned mutable resources. Preserve that distinction in operation authorization, and expose the actual external target before a destructive ownership transfer.
• proposed — Model destination promotion and source cleanup as separate recoverable states. Serialize competing transfers for the same skill, reconcile the registry after partial completion, and exercise retry and interruption after promotion without deleting the committed destination.

🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Regression Evidence	⚠️ Warning	The new EXDEV move fallback lacks coverage for source-cleanup failure. moveDirectory promotes the staging copy, then calls fs.rm(sourceDir) outside its guarded copy/promotion block (`SkillsManager…	Add a focused SkillsManager unit test for successful EXDEV copy and promotion followed by a rejected fs.rm(sourceDir). Assert that moveSkill propagates the cleanup error and does not remove the promoted destination. Define and assert …

✅ Passed checks (7 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue #1842 requires discovery of skills inside a symlinked container. scanSkillsDirectory follows directory symlinks, recursively scans containers without SKILL.md, and loads nested skills. The a…
Out of Scope Changes check	✅ Passed	The changes to duplicate checks and moveSkill support managing skills found by recursive discovery. The move fallback handles skills on another filesystem, and cleanup guards protect the external so…
Security Boundaries	✅ Passed	No changed path meets the stated security failure conditions. SkillsManager.ts now follows container symlinks and reads matching SKILL.md files outside the configured root, but it parses metadata …
Persistence Integrity	✅ Passed	No changed path meets the persistence-integrity failure condition. In moveDirectory, the PR awaits the initial rename; on EXDEV, it awaits a copy to a staging directory, promotes it by rename, and…
Lifecycle Resource Cleanup	✅ Passed	No concrete lifecycle resource leak or duplicate-work path was introduced. The new scan is awaited, bounded to depth 5, and deduplicates real paths with a per-root visited set. The EXDEV move fallback…
Title check	✅ Passed	The title clearly summarizes the main change: discovering skills inside symlinked container directories.
Description check	✅ Passed	The description identifies linked issue #1842, explains the problem, gives a reproducible test procedure, and completes the relevant checklist and documentation sections.

Full details: Regression Evidence

Explanation

The new EXDEV move fallback lacks coverage for source-cleanup failure. moveDirectory promotes the staging copy, then calls fs.rm(sourceDir) outside its guarded copy/promotion block (SkillsManager.ts:700). If removal fails, the method rejects after the destination has been created, which can leave both copies or a partially removed source. The tests cover copy failure, promotion failure, destination conflicts, and non-EXDEV rename errors, but none makes mockRm reject during source removal (SkillsManager.spec.ts:2502–2559). This is a concrete error path in the new cross-filesystem behavior.

Resolution

Add a focused SkillsManager unit test for successful EXDEV copy and promotion followed by a rejected fs.rm(sourceDir). Assert that moveSkill propagates the cleanup error and does not remove the promoted destination. Define and assert the expected source/destination state for this failure path.

• Fix all pre-merge checks with AI

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Files with missing lines	Patch %	Lines
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Inline comments:
Review comments at @src/services/skills/__tests__/SkillsManager.spec.ts:
- Around line 736-794: Extend the depth-limit test around
SkillsManager.discoverSkills with a fixture placing a skill in a container at
depth 5, and assert that it is discovered. This should distinguish the inclusive
depth-5 boundary from a guard that stops scanning when depth is greater than or
equal to 5.

Review comments at @src/services/skills/SkillsManager.ts:
- Around line 98-102: Update scanSkillsDirectory to track visited directories by
real path and skip directories already encountered, passing the same set through
recursive calls. Create a fresh visited set for each top-level scan so traversal
remains deduplicated without sharing state across source or mode roots.
- Around line 93-102: Update loadSkillMetadata to preserve the first skill
stored under a colliding source:mode:name key: check whether skillKey already
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src/services/skills/SkillsManager.ts

[warning] 71-71: Mutation test advisory
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Inline comments:
Review comments at @src/services/skills/SkillsManager.ts:
- Around line 87-93: Update the visited tracking in scanSkillsDirectory to store
the shallowest depth for each real directory instead of only recording whether
it was visited. Skip a directory only when its recorded depth is no deeper than
the current depth; otherwise update the depth and rescan so shallow aliases can
discover nested skills within the limit.
- Around line 104-114: Update scanSkillsDirectory to register watchers for
resolved container targets it discovers, so edits to nested skills refresh
cached frontmatter metadata such as modeSlugs and description. Keep the existing
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🔇 Additional comments (3)

src/services/skills/SkillsManager.ts (2)

104-114: Keep the first skill when a nested name collides.

The recursive branch on Line 113 can find two skills with the same leaf name in different containers, such as repo-a/foo and repo-b/foo. loadSkillMetadata saves both under the same source:mode:name key on Line 201. The second skill found replaces the first one. getSkillContent and the prompt listing look up skills by leaf name only, so users can no longer reach the replaced skill. An earlier review reported this issue, and the current code still has it.

This fix also stops a later root at the same source and mode from replacing an earlier one. The comment at Lines 620-627 says the later root should win, so .roo still takes priority over .agents. To keep that rule, track the keys seen in each root scan and apply the first-wins check only inside one root scan.

---

48-51: LGTM!

Also applies to: 55-78, 87-93

src/services/skills/__tests__/SkillsManager.spec.ts (1)

619-991: LGTM!

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Inline comments:
Review comments at @src/services/skills/__tests__/SkillsManager.spec.ts:
- Around line 997-1087: Update the nested symlink test in SkillsManager.spec.ts
to use a privateDir under /repo/skills-private, exercising a sibling-prefix
containment case against the /repo/skills root. Update mockDirectoryExists to
return true for escapingLink so discovery reaches its realpath and can verify
the escaping target is rejected.
- Around line 1612-1669: Update the mockReadFile behavior in the “should not let
a superseded discovery run repopulate skills” test to return distinct
descriptions for the stale and current discovery reads, then assert the
resulting skill description matches the current discovery generation. Keep the
existing count and name assertions.

Review comments at @src/services/skills/SkillsManager.ts:
- Around line 195-201: In discoverSkills, add a finite per-discovery directory
visit budget: before adding a new real path to visited, check whether the budget
is exhausted and stop scanning when it is. Keep the existing approvedRoots
containment checks and deduplication behavior.

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[warning] 106-106: Mutation test advisory
src/services/skills/SkillsManager.ts:106: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.

---

[warning] 105-105: Mutation test advisory
src/services/skills/SkillsManager.ts:105: Survived MethodExpression mutant (replacement: root.startsWith(path.sep)). See the job summary for the complete list and resolution guidance.

---

[warning] 101-101: Mutation test advisory
src/services/skills/SkillsManager.ts:101: NoCoverage BooleanLiteral mutant (replacement: false). See the job summary for the complete list and resolution guidance.

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[warning] 100-100: Mutation test advisory
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---

[warning] 80-80: Mutation test advisory
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---

[warning] 63-63: Mutation test advisory
src/services/skills/SkillsManager.ts:63: Survived ConditionalExpression mutant (replacement: false). See the job summary for the complete list and resolution guidance.

---

[warning] 56-56: Mutation test advisory
src/services/skills/SkillsManager.ts:56: Survived UpdateOperator mutant (replacement: --this.discoveryGeneration). See the job summary for the complete list and resolution guidance.

🔇 Additional comments (4)

src/services/skills/SkillsManager.ts (2)

54-81: LGTM!

---

311-317: LGTM!

Also applies to: 868-870

src/services/skills/__tests__/SkillsManager.spec.ts (2)

1560-1669: LGTM!

---

619-995: LGTM!

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Review comments at @src/services/skills/SkillsManager.ts:
- Around line 649-677: Update moveDirectory to copy into a unique staging path
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📓 Path-based instructions (5)

Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...

⚙️ CodeRabbit configuration file

Files:

• src/services/skills/__tests__/SkillsManager.spec.ts
• src/services/skills/SkillsManager.ts

Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.

⚙️ CodeRabbit configuration file

Files:

• src/services/skills/__tests__/SkillsManager.spec.ts

Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.

⚙️ CodeRabbit configuration file

Files:

• src/services/skills/__tests__/SkillsManager.spec.ts
• src/services/skills/SkillsManager.ts

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

⚙️ CodeRabbit configuration file

Files:

• src/services/skills/__tests__/SkillsManager.spec.ts
• src/services/skills/SkillsManager.ts

Act as an adversarial second-opinion reviewer.

⚙️ CodeRabbit configuration file

Files:

• src/services/skills/__tests__/SkillsManager.spec.ts
• src/services/skills/SkillsManager.ts

🪛 GitHub Check: mutation-diff

src/services/skills/SkillsManager.ts

[warning] 52-52: Mutation test advisory
src/services/skills/SkillsManager.ts:52: Survived CallExpression mutant (replacement: ;). See the job summary for the complete list and resolution guidance.

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[warning] 266-266: Mutation test advisory
src/services/skills/SkillsManager.ts:266: Survived LogicalOperator mutant (replacement: rootDir && path.dirname(skillDir)). See the job summary for the complete list and resolution guidance.

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[warning] 264-264: Mutation test advisory
src/services/skills/SkillsManager.ts:264: Survived OptionalChaining mutant (replacement: claimedDepths.set). See the job summary for the complete list and resolution guidance.

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[warning] 253-253: Mutation test advisory
src/services/skills/SkillsManager.ts:253: 3 mutation test gaps; example: NoCoverage StringLiteral mutant (replacement: ""). See the job summary for the complete list and resolution guidance.

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[warning] 252-252: Mutation test advisory
src/services/skills/SkillsManager.ts:252: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.

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[warning] 251-251: Mutation test advisory
src/services/skills/SkillsManager.ts:251: Survived OptionalChaining mutant (replacement: claimedDepths.get). See the job summary for the complete list and resolution guidance.

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[warning] 501-501: Mutation test advisory
src/services/skills/SkillsManager.ts:501: Survived LogicalOperator mutant (replacement: existingSkill || existingRoot). See the job summary for the complete list and resolution guidance.

🔇 Additional comments (1)

src/services/skills/__tests__/SkillsManager.spec.ts (1)

623-738: LGTM!