Skill Retriever
Graph-based MCP server for Claude Code component retrieval.
Given a task description, returns the minimal correct set of components (agents, skills, commands, hooks, MCPs) with all dependencies resolved.
Current Index
1,027 components from 23 repositories, auto-discovered and synced.
| Type | Count | Description |
|---|---|---|
| Skills | 529 | Portable instruction sets that package domain expertise and procedural knowledge |
| Agents | 419 | Specialized AI personas with isolated context and fine-grained permissions |
| Commands | 36 | Slash commands (/commit, /review, etc.) |
| Hooks | 20 | Event handlers (SessionStart, PreCompact, etc.) |
| MCPs | 20 | Model Context Protocol servers for external integrations |
| Settings | 3 | Configuration presets |
Top Repositories
| Repository | Components | Description |
|---|---|---|
| wshobson/agents | 221 | Multi-agent orchestration with 129 skills |
| VoltAgent/awesome-agent-skills | 172 | 200+ curated skills compatible with Codex, Gemini CLI |
| davepoon/buildwithclaude | 152 | Full-stack development skills |
| BehiSecc/awesome-claude-skills | 61 | Document processing, security, scientific skills |
| anthropics/skills | 17 | Official Anthropic skills (Excel, PowerPoint, PDF, skill-creator) |
| obra/superpowers | 13 | TDD, debugging, and software development methodology |
What Problem Does This Solve?
Claude Code supports custom components stored in .claude/ directories.
The Agent Skills Standard
Skills are folders of instructions that extend Claude's capabilities. Every skill includes a SKILL.md markdown file containing name, description, and instructions. Skills are progressively disclosed—only name and description load initially; full instructions load only when triggered.
The open standard means skills work across:
- Claude AI and Claude Desktop
- Claude Code
- Claude Agent SDK
- Codex, Gemini CLI, OpenCode, and other compatible platforms
Component Types Explained
| Type | What It Does | When to Use |
|---|---|---|
| Skill | Packages domain expertise + procedural knowledge into portable instructions | Repeatable workflows, company-specific analysis, new capabilities |
| Agent | Spawned subprocess with isolated context and tool access | Parallel execution, specialized tasks, permission isolation |
| Command | Slash command (/name) that triggers specific behavior | Quick actions, shortcuts, task invocation |
| Hook | Runs automatically on events (SessionStart, PreCompact) | Context setup, auto-save, cleanup |
| MCP | Model Context Protocol server connecting to external systems | Database access, APIs, file systems |
Skills vs Tools vs Subagents
| Concept | Analogy | Persistence | Context |
|---|---|---|---|
| Tools | Hammer, saw, nails | Always in context | Adds to main window |
| Skills | How to build a bookshelf | Progressively loaded | Name/desc → SKILL.md → refs |
| Subagents | Hire a specialist | Session-scoped | Isolated from parent |
Key insight: Skills solve the context window problem. By progressively disclosing instructions, they avoid polluting context with data that may never be needed.
The Problem This Solves
There are now 800+ community components scattered across GitHub repos. Finding the right ones for your task, understanding their dependencies, and ensuring compatibility is painful.
Skill Retriever solves this by:
- Indexing component repositories into a searchable knowledge graph
- Understanding dependencies between components
- Returning exactly what you need for a given task (not too much, not too little)
- Installing them directly into your
.claude/directory
Architecture
┌─────────────────────────────────────────────────────────────────┐
│ Claude Code │
│ │
│ "I need to add git commit automation" │
│ │ │
│ ▼ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ MCP Client (built into Claude Code) │ │
│ │ │ │
│ │ tools/call: search_components │ │
│ │ tools/call: install_components │ │
│ │ tools/call: check_dependencies │ │
│ └──────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
│
│ stdio (JSON-RPC)
▼
┌─────────────────────────────────────────────────────────────────┐
│ Skill Retriever MCP Server │
│ │
│ ┌─────────────┐ ┌─────────────┐ ┌─────────────────────────┐ │
│ │ Vector │ │ Graph │ │ Metadata │ │
│ │ Store │ │ Store │ │ Store │ │
│ │ (FAISS) │ │ (NetworkX) │ │ (JSON) │ │
│ └─────────────┘ └─────────────┘ └─────────────────────────┘ │
│ │ │ │ │
│ └────────────────┼────────────────────┘ │
│ ▼ │
│ ┌───────────────────────┐ │
│ │ Retrieval Pipeline │ │
│ │ │ │
│ │ 1. Vector Search │ │
│ │ 2. Graph PPR │ │
│ │ 3. Score Fusion │ │
│ │ 4. Dep Resolution │ │
│ │ 5. Conflict Check │ │
│ │ 6. Context Assembly │ │
│ └───────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
How It Works
1. Ingestion (Indexing Repositories)
When you ingest a component repository:
Repository (GitHub)
│
▼
┌──────────────────┐
│ Clone to temp │
└──────────────────┘
│
▼
┌──────────────────┐ Strategies (first match wins):
│ Crawler │ 1. Davila7Strategy: cli-tool/components/{type}/
│ (Strategy-based)│ 2. PluginMarketplaceStrategy: plugins/{name}/skills/
└──────────────────┘ 3. FlatDirectoryStrategy: .claude/{type}/
│ 4. GenericMarkdownStrategy: Any *.md with name frontmatter
│ 5. AwesomeListStrategy: README.md curated lists
│ 6. PythonModuleStrategy: *.py with docstrings
▼
┌──────────────────┐
│ Entity Resolver │ Deduplicates similar components using:
│ (Fuzzy + Embed) │ - RapidFuzz token_sort_ratio (Phase 1)
└──────────────────┘ - Embedding cosine similarity (Phase 2)
│
▼
┌──────────────────┐
│ Index into: │
│ - Graph nodes │ Component → Node with type, label
│ - Graph edges │ Dependencies → DEPENDS_ON edges
│ - Vector store │ Embeddings for semantic search
│ - Metadata │ Full content for installation
└──────────────────┘
2. Retrieval (Finding Components)
When you search for components:
Query: "git commit automation with conventional commits"
│
▼
┌───────────────────────────────────────────────────────────────┐
│ Query Planning │
│ │
│ - Extract entities (keywords, component names) │
│ - Determine complexity (simple/medium/complex) │
│ - Decide: use PPR? use flow pruning? │
│ - Detect abstraction level (agent vs command vs hook) │
└───────────────────────────────────────────────────────────────┘
│
┌───────────┴───────────┐
▼ ▼
┌───────────────┐ ┌───────────────────────┐
│ Vector Search │ │ Graph PPR (PageRank) │
│ │ │ │
│ Semantic │ │ Follows dependency │
│ similarity │ │ edges to find │
│ via FAISS │ │ related components │
└───────────────┘ └───────────────────────┘
│ │
└───────────┬───────────┘
▼
┌───────────────────────────────────────────────────────────────┐
│ Score Fusion │
│ │
│ Combined score = α × vector_score + (1-α) × graph_score │
│ Filtered by component type if specified │
└───────────────────────────────────────────────────────────────┘
│
▼
┌───────────────────────────────────────────────────────────────┐
│ Transitive Dependency Resolution │
│ │
│ If "commit-command" depends on "git-utils" which depends │
│ on "shell-helpers" → all three are included │
└───────────────────────────────────────────────────────────────┘
│
▼
┌───────────────────────────────────────────────────────────────┐
│ Conflict Detection │
│ │
│ Check CONFLICTS_WITH edges between selected components │
│ Warn if incompatible components would be installed │
└───────────────────────────────────────────────────────────────┘
│
▼
┌───────────────────────────────────────────────────────────────┐
│ Context Assembly │
│ │
│ - Sort by type priority (agents > skills > commands) │
│ - Estimate token cost per component │
│ - Stay within token budget │
│ - Generate rationale for each recommendation │
└───────────────────────────────────────────────────────────────┘
│
▼
┌───────────────────────────────────────────────────────────────┐
│ Results │
│ │
│ [ │
│ { id: "davila7/commit-command", score: 0.92, │
│ rationale: "High semantic match + 3 dependents" }, │
│ { id: "davila7/git-utils", score: 0.85, │
│ rationale: "Required dependency of commit-command" } │
│ ] │
└───────────────────────────────────────────────────────────────┘
3. Installation
When you install components:
install_components(["davila7/commit-command"])
│
▼
┌───────────────────────────────────────────────────────────────┐
│ Resolve Dependencies │
│ │
│ commit-command → [git-utils, shell-helpers] │
│ Total: 3 components to install │
└───────────────────────────────────────────────────────────────┘
│
▼
┌───────────────────────────────────────────────────────────────┐
│ Write to .claude/ │
│ │
│ .claude/ │
│ ├── commands/ │
│ │ └── commit.md ← commit-command │
│ └── skills/ │
│ ├── git-utils.md ← dependency │
│ └── shell-helpers.md ← transitive dependency │
└───────────────────────────────────────────────────────────────┘
4. Discovery Pipeline (OSS-01, HEAL-01)
Automatically discovers and ingests high-quality skill repositories from GitHub:
┌─────────────────────────────────────────────────────────────────┐
│ Discovery Pipeline │
│ │
│ ┌──────────────────┐ │
│ │ OSS Scout │ Searches GitHub for skill repos: │
│ │ │ - 8 search queries (claude, skills, etc) │
│ │ discover() │ - MIN_STARS: 5 │
│ │ ─────────────▶ │ - Recent activity: 180 days │
│ └────────┬─────────┘ - Quality scoring (stars, topics, etc) │
│ │ │
│ ▼ │
│ ┌──────────────────┐ │
│ │ Filter & Score │ Score = stars (40) + recency (20) │
│ │ │ + topics (20) + description (10) │
│ │ min_score: 30 │ + forks (10) │
│ └────────┬─────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────┐ │
│ │ Ingest New │ Clone → Crawl → Dedupe → Index │
│ │ (max 10/run) │ Uses same pipeline as ingest_repo │
│ └────────┬─────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────┐ │
│ │ Auto-Healer │ Tracks failures: │
│ │ │ - CLONE_FAILED, NO_COMPONENTS │
│ │ MAX_RETRIES: 3 │ - NETWORK_ERROR, RATE_LIMITED │
│ └──────────────────┘ Automatically retries healable failures │
└─────────────────────────────────────────────────────────────────┘
5. Auto-Sync (SYNC-01, SYNC-02)
Repositories can be tracked for automatic updates:
┌─────────────────────────────────────────────────────────────────┐
│ Sync Manager │
│ │
│ ┌──────────────────┐ ┌──────────────────────────────┐ │
│ │ Webhook Server │ │ Repo Poller │ │
│ │ (port 9847) │ │ (hourly by default) │ │
│ │ │ │ │ │
│ │ POST /webhook │ │ GET /repos/{owner}/{repo} │ │
│ │ ← GitHub push │ │ → GitHub API │ │
│ └────────┬─────────┘ └──────────────┬───────────────┘ │
│ │ │ │
│ └─────────────┬─────────────────────┘ │
│ ▼ │
│ ┌─────────────────────┐ │
│ │ Change Detected? │ │
│ │ (new commit SHA) │ │
│ └──────────┬──────────┘ │
│ │ yes │
│ ▼ │
│ ┌─────────────────────┐ │
│ │ Re-ingest Repo │ │
│ │ (incremental) │ │
│ └─────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
6. Feedback Loop (LRNG-04, LRNG-05, LRNG-06)
Execution outcomes feed back into the graph to improve future recommendations:
┌─────────────────────────────────────────────────────────────────┐
│ Feedback Loop │
│ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Outcome Tracking (LRNG-05) │ │
│ │ │ │
│ │ install_components() │ │
│ │ │ │ │
│ │ ├── success → INSTALL_SUCCESS + bump usage │ │
│ │ └── failure → INSTALL_FAILURE + track context │ │
│ │ │ │
│ │ report_outcome() │ │
│ │ ├── USED_IN_SESSION → usage count++ │ │
│ │ ├── REMOVED_BY_USER → negative feedback │ │
│ │ └── DEPRECATED → deprecation flag │ │
│ └──────────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Usage-Based Boosting (LRNG-04) │ │
│ │ │ │
│ │ Selection Rate Boost: │ │
│ │ high_selection_rate → +50% score boost │ │
│ │ low_selection_rate → no boost │ │
│ │ │ │
│ │ Co-Selection Boost: │ │
│ │ frequently_selected_together → +10% each (max 30%) │ │
│ │ │ │
│ │ Final score = base_score × boost_factor │ │
│ └──────────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Feedback Engine (LRNG-06) │ │
│ │ │ │
│ │ analyze_feedback() discovers patterns: │ │
│ │ │ │
│ │ Co-selections (≥3) → suggest BUNDLES_WITH edge │ │
│ │ Co-failures (≥2) → suggest CONFLICTS_WITH edge │ │
│ │ │ │
│ │ Human reviews suggestions via review_suggestion() │ │
│ │ Accepted suggestions → apply_feedback_suggestions() │ │
│ │ New edges added to graph with confidence scores │ │
│ └──────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
Key insight: The system learns from real-world usage. Components that work well together get boosted. Components that fail together get flagged as conflicts. This creates a self-improving recommendation engine.
7. Security Scanning (SEC-01)
Scans components for security vulnerabilities during ingestion and on-demand:
┌─────────────────────────────────────────────────────────────────┐
│ Security Scanner │
│ │
│ Based on Yi Liu et al. "Agent Skills in the Wild" research: │
│ - 26.1% of skills contain vulnerable patterns │
│ - 5.2% show malicious intent indicators │
│ - Skills with scripts are 2.12x more likely to be vulnerable │
│ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Vulnerability Detection │ │
│ │ │ │
│ │ Data Exfiltration (13.3%) │ │
│ │ - HTTP POST with data payload │ │
│ │ - File read + external request │ │
│ │ - Webhook endpoints │ │
│ │ │ │
│ │ Credential Access │ │
│ │ - Environment variable harvesting │ │
│ │ - SSH key / AWS credential access │ │
│ │ - Sensitive env vars (API_KEY, SECRET, TOKEN) │ │
│ │ │ │
│ │ Privilege Escalation (11.8%) │ │
│ │ - Shell injection via variable interpolation │ │
│ │ - Dynamic code execution (eval/exec) │ │
│ │ - sudo execution, chmod 777 │ │
│ │ - Download and execute patterns │ │
│ │ │ │
│ │ Obfuscation (malicious intent) │ │
│ │ - Hex-encoded strings │ │
│ │ - Unicode escapes │ │
│ │ - String concatenation obfuscation │ │
│ └──────────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Risk Assessment │ │
│ │ │ │
│ │ Risk Levels: safe → low → medium → high → critical │ │
│ │ │ │
│ │ Risk Score (0-100): │ │
│ │ Base = sum of finding weights │ │
│ │ Script multiplier = 1.5x if has_scripts │ │
│ │ │ │
│ │ Each component stores: │ │
│ │ - security_risk_level │ │
│ │ - security_risk_score │ │
│ │ - security_findings_count │ │
│ │ - has_scripts │ │
│ └──────────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Integration Points │ │
│ │ │ │
│ │ Ingestion: scan during ingest_repo() │ │
│ │ Retrieval: include SecurityStatus in search results │ │
│ │ On-demand: security_scan() and security_audit() tools │ │
│ └──────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
Key insight: Security scanning catches 22%+ of potentially vulnerable patterns before they reach your codebase. The system flags data exfiltration, credential access, privilege escalation, and code obfuscation.
Current Index Statistics:
| Risk Level | Count | % |
|---|---|---|
| Safe | 796 | 77.5% |
| Low | 2 | 0.2% |
| Medium | 19 | 1.9% |
| High | 8 | 0.8% |
| Critical | 202 | 19.7% |
Top Finding Patterns (in CRITICAL components):
| Pattern | Count | Notes |
|---|---|---|
shell_injection | 424 | Many are bash examples in markdown (false positives) |
webhook_post | 87 | Discord/Slack webhook URLs |
env_harvest_all | 74 | process.env / os.environ access |
ssh_key_access | 51 | References to .ssh/ paths |
http_post_with_data | 38 | HTTP POST with data payload |
Known Limitations:
- The
shell_injectionpattern has false positives for bash code blocks in markdown - Webhook patterns flag legitimate integrations (Discord bots, Slack notifications)
8. LLM-Assisted Security Analysis (SEC-02)
Optional layer on top of regex scanning that uses Claude to reduce false positives:
┌─────────────────────────────────────────────────────────────────┐
│ LLM Security Analyzer (SEC-02) │
│ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ When to Use │ │
│ │ │ │
│ │ - Component flagged HIGH/CRITICAL by regex scanner │ │
│ │ - Suspected false positives (shell commands in docs) │ │
│ │ - Need confidence before installing critical component │ │
│ └──────────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Analysis Process │ │
│ │ │ │
│ │ 1. Run regex scan (SEC-01) to get findings │ │
│ │ 2. Send findings + component content to Claude │ │
│ │ 3. Claude analyzes each finding: │ │
│ │ - Is it in documentation vs executable code? │ │
│ │ - Is it legitimate functionality (JWT accessing env)?│ │
│ │ - Context: webhook in notification skill = expected │ │
│ │ 4. Returns verdict per finding: │ │
│ │ - TRUE_POSITIVE: Real security concern │ │
│ │ - FALSE_POSITIVE: Safe, incorrectly flagged │ │
│ │ - CONTEXT_DEPENDENT: Depends on usage │ │
│ │ - NEEDS_REVIEW: Cannot determine, human review │ │
│ └──────────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ ┌──────────────────────────────────────────────────────────┐ │
│ │ Adjusted Risk Score │ │
│ │ │ │
│ │ Original score = 75 (CRITICAL, 5 findings) │ │
│ │ │ │
│ │ LLM analysis: │ │
│ │ - 3 × FALSE_POSITIVE (bash in markdown) │ │
│ │ - 1 × TRUE_POSITIVE (env var harvesting) │ │
│ │ - 1 × CONTEXT_DEPENDENT │ │
│ │ │ │
│ │ Adjusted score = 75 × (1 + 0.5) / 5 = 22.5 (MEDIUM) │ │
│ └──────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
Requirements:
ANTHROPIC_API_KEYenvironment variable setanthropicpackage installed (included in dependencies)
Usage:
# Full LLM analysis of a flagged component
security_scan_llm(component_id="owner/repo/skill/name")
# Returns:
{
"component_id": "...",
"llm_available": true,
"original_risk_level": "critical",
"adjusted_risk_level": "medium",
"original_risk_score": 75.0,
"adjusted_risk_score": 22.5,
"finding_analyses": [
{
"pattern_name": "shell_injection",
"verdict": "false_positive",
"confidence": 0.95,
"reasoning": "Pattern in markdown code block showing CLI usage",
"is_in_documentation": true,
"mitigations": []
}
],
"overall_assessment": "Low actual risk...",
"false_positive_count": 3,
"true_positive_count": 1,
"context_dependent_count": 1
}
Cost Consideration: LLM analysis uses Claude API calls (~2000 tokens per component). Use selectively for:
- Components you plan to install
- HIGH/CRITICAL flagged components
- Components with many findings that may be false positives
Integration with Claude Code
Setup
- Add to Claude Code's MCP config (
~/.claude/claude_desktop_config.json):
{
"mcpServers": {
"skill-retriever": {
"command": "uv",
"args": ["run", "--directory", "/path/to/skill-retriever", "skill-retriever"]
}
}
}
- Restart Claude Code to load the MCP server.
Available Tools
Once configured, Claude Code can use these tools:
| Tool | Purpose |
|---|---|
| Search & Install | |
search_components | Find components for a task description |
get_component_detail | Get full info about a specific component |
install_components | Install components to .claude/ (auto-records outcome) |
check_dependencies | Check deps and conflicts before install |
| Ingestion | |
ingest_repo | Index a new component repository |
| Sync Management | |
register_repo | Track a repo for auto-sync |
unregister_repo | Stop tracking a repo |
list_tracked_repos | List all tracked repos |
sync_status | Get sync system status |
start_sync_server | Start webhook + poller |
stop_sync_server | Stop sync services |
poll_repos_now | Trigger immediate poll |
| Discovery Pipeline | |
run_discovery_pipeline | Discover + ingest new skill repos from GitHub |
discover_repos | Search GitHub for skill repositories |
get_pipeline_status | Get discovery pipeline configuration |
get_heal_status | View auto-heal failures and status |
clear_heal_failures | Clear tracked failures |
| Outcome Tracking | |
report_outcome | Record usage outcome (used, removed, deprecated) |
get_outcome_stats | Get success/failure stats for a component |
get_outcome_report | View problematic components and conflicts |
| Feedback Engine | |
analyze_feedback | Analyze patterns to suggest graph improvements |
get_feedback_suggestions | View pending edge suggestions |
review_suggestion | Accept or reject a suggested edge |
apply_feedback_suggestions | Apply accepted suggestions to the graph |
| Security Scanning | |
security_scan | Scan a specific component for vulnerabilities (regex) |
security_scan_llm | Scan with LLM false-positive reduction (requires API key) |
security_audit | Audit all components, report by risk level |
backfill_security_scans | Scan existing components that haven't been scanned |
Example Conversation
User: I need to set up git commit automation with conventional commits
Claude: Let me search for relevant components.
[Calls search_components with query="git commit automation conventional commits"]
I found 3 components that would help:
1. **commit-command** (command) - Automated git commits with conventional format
- Score: 0.92
- Health: active (updated 2 days ago)
- Token cost: 450
2. **git-utils** (skill) - Git helper functions
- Score: 0.85
- Required by: commit-command
3. **conventional-commits-hook** (hook) - Pre-commit validation
- Score: 0.78
- Health: active
Would you like me to install these?
User: Yes, install them
Claude: [Calls install_components with ids=["davila7/commit-command", "davila7/conventional-commits-hook"]]
Installed 4 components to .claude/:
- commands/commit.md
- skills/git-utils.md
- skills/shell-helpers.md (dependency)
- hooks/conventional-commits.md
You can now use `/commit` to create conventional commits!
Workflow with Security Integration
┌─────────────────────────────────────────────────────────────────┐
│ Claude Code + Skill Retriever Workflow │
│ │
│ 1. USER: "I need JWT authentication" │
│ │ │
│ ▼ │
│ 2. CLAUDE: search_components("JWT authentication") │
│ │ │
│ ▼ │
│ 3. SKILL RETRIEVER returns: │
│ ┌────────────────────────────────────────────────────┐ │
│ │ auth-jwt-skill │ │
│ │ Score: 0.89 │ │
│ │ Health: active (2 days ago) │ │
│ │ Security: ⚠️ MEDIUM (env_sensitive_keys) │ │
│ │ Tokens: 320 │ │
│ │ │ │
│ │ crypto-utils │ │
│ │ Score: 0.72 │ │
│ │ Health: active │ │
│ │ Security: ✅ SAFE │ │
│ │ Tokens: 180 │ │
│ └────────────────────────────────────────────────────┘ │
│ │ │
│ ▼ │
│ 4. CLAUDE: "auth-jwt-skill has MEDIUM security risk │
│ (accesses JWT_SECRET from env). Proceed?" │
│ │ │
│ ▼ │
│ 5. USER: "Yes, that's expected for JWT" │
│ │ │
│ ▼ │
│ 6. CLAUDE: install_components(["auth-jwt-skill"]) │
│ │ │
│ ▼ │
│ 7. SKILL RETRIEVER: │
│ - Resolves dependencies (adds crypto-utils) │
│ - Writes to .claude/skills/ │
│ - Records INSTALL_SUCCESS outcome │
│ │ │
│ ▼ │
│ 8. CLAUDE: "Installed auth-jwt-skill + crypto-utils. │
│ Note: Requires JWT_SECRET env variable." │
└─────────────────────────────────────────────────────────────────┘
Security-Aware Retrieval
When search_components returns results, each component includes:
{
"id": "owner/repo/skill/auth-jwt",
"name": "auth-jwt",
"type": "skill",
"score": 0.89,
"rationale": "High semantic match + required dependency",
"token_cost": 320,
"health": {
"status": "active",
"last_updated": "2026-02-02T10:30:00Z",
"commit_frequency": "high"
},
"security": {
"risk_level": "medium",
"risk_score": 25.0,
"findings_count": 1,
"has_scripts": false
}
}
Best Practice: Claude should surface security warnings to users before installation, especially for CRITICAL and HIGH risk components.
Backfilling Existing Components
If you have components indexed before SEC-01 was implemented:
User: Run a security audit on all components
Claude: [Calls security_audit(risk_level="medium")]
Security Audit Results:
- Total: 1027 components
- Safe: 796 (77.5%)
- Low: 2 (0.2%)
- Medium: 19 (1.9%)
- High: 8 (0.8%)
- Critical: 202 (19.7%)
Would you like to see the flagged components?
User: Yes, show critical ones
Claude: [Shows list of critical components with their findings]
Note: Many "shell_injection" findings are false positives from
bash code examples in markdown. Review manually for true concerns.
To backfill security scans for components indexed before SEC-01:
Claude: [Calls backfill_security_scans(force_rescan=false)]
Data Flow Summary
┌─────────────┐ ┌──────────────┐ ┌─────────────────┐
│ GitHub │────▶│ Ingestion │────▶│ Graph Store │
│ Repos │ │ Pipeline │ │ (NetworkX) │
└─────────────┘ └──────────────┘ └─────────────────┘
│
▼
┌─────────────┐ ┌──────────────┐ ┌─────────────────┐
│ Claude │◀───▶│ MCP │◀───▶│ Retrieval │
│ Code │ │ Server │ │ Pipeline │
└─────────────┘ └──────────────┘ └─────────────────┘
│ │
▼ ▼
┌──────────────┐ ┌─────────────────┐
│ .claude/ │ │ Vector Store │
│ directory │ │ (FAISS) │
└──────────────┘ └─────────────────┘
Key Design Decisions
- Hybrid retrieval (vector + graph) — Semantic similarity alone misses dependency relationships
- Incremental ingestion — Only re-index changed files, not entire repos
- Entity resolution — Deduplicate similar components across repos
- Token budgeting — Don't overwhelm Claude's context window
- Health signals — Surface stale/abandoned components
- MCP protocol — Native integration with Claude Code (no plugins needed)
- Security-first scanning — 26% of skills contain vulnerabilities; scan before installation
Requirements Coverage
v1 (Complete)
- Ingestion: crawl any repo structure, extract metadata + git signals
- Retrieval: semantic search + graph traversal + score fusion
- Dependencies: transitive resolution + conflict detection
- Integration: MCP server + component installation
v2 (Implemented)
- SYNC-01: Webhook server for GitHub push events
- SYNC-02: Auto-reingest on detected changes
- SYNC-03: Incremental ingestion
- OSS-01: GitHub-based repository discovery (OSS Scout)
- HEAL-01: Auto-heal for failed ingestions with retry logic
- RETR-06: Abstraction level awareness
- RETR-07: Fuzzy entity extraction with RapidFuzz + synonym expansion
- LRNG-03: Co-occurrence tracking
- LRNG-04: Usage-based score boosting (selection rate + co-selection)
- LRNG-05: Outcome tracking (install success/failure, usage, removal)
- LRNG-06: Feedback engine for implicit edge discovery
- HLTH-01: Component health status
- SEC-01: Security vulnerability scanning (based on Yi Liu et al. research)
- SEC-02: LLM-assisted false positive reduction for security scanning
Deferred
- RETR-05: LLM-assisted query rewriting
- LRNG-01/02: Collaborative filtering from usage patterns
- HLTH-02: Deprecation warnings
- SEC-02: LLM-assisted false positive reduction ✅ IMPLEMENTED
- SEC-03: Real-time re-scanning of installed components
Troubleshooting
Ingestion Failures
# Check auto-heal status
get_heal_status()
| Failure Type | Cause | Solution |
|---|---|---|
CLONE_FAILED | Network timeout, auth required | Check URL, verify public access |
NO_COMPONENTS | Repo has no Claude Code components | Expected for non-skill repos |
RATE_LIMITED | GitHub API limit exceeded | Wait 1 hour, retry |
PARSE_ERROR | Malformed markdown/YAML | Open issue on source repo |
To retry failed ingestion:
clear_heal_failures()
ingest_repo(repo_url="https://github.com/owner/repo", incremental=False)
Search Returns Empty Results
-
Verify index is loaded:
sync_status() # Check tracked_repos > 0 -
Check if component exists:
get_component_detail(component_id="owner/repo/skill/name") -
Try broader search terms:
- "auth" instead of "JWT RS256 authentication"
- Remove specific technology mentions
-
Check type filter isn't too restrictive:
search_components(query="auth", component_type=None) # Remove filter
Installation Failures
# Always check dependencies first
check_dependencies(component_ids=["id1", "id2"])
| Error | Cause | Solution |
|---|---|---|
| Component not found | Not in metadata store | ingest_repo() the source repo |
| Conflict detected | Incompatible components | Choose one, or use conflicts field to understand |
| Write permission denied | Target dir not writable | Check .claude/ exists and is writable |
Security Scan False Positives
The shell_injection pattern flags many legitimate bash examples:
# This is flagged but safe (bash in markdown):
gh pr view $PR_NUMBER
# This would be actually dangerous:
eval "$USER_INPUT"
To review false positives:
security_scan(component_id="owner/repo/skill/name")
# Review each finding's matched_text
MCP Server Won't Start
- Check Python version: Requires 3.11+
- Check dependencies:
uv sync - Check port conflicts: Webhook server uses 9847
- Check Claude Code config:
{ "mcpServers": { "skill-retriever": { "command": "uv", "args": ["run", "--directory", "/path/to/skill-retriever", "skill-retriever"] } } }
Data Corruption
If the index seems corrupted:
# Backup existing data
cp -r ~/.skill-retriever/data ~/.skill-retriever/data.bak
# Clear and re-ingest
rm ~/.skill-retriever/data/*.json
rm -rf ~/.skill-retriever/data/vectors/
# Re-run discovery pipeline
run_discovery_pipeline(dry_run=False, max_new_repos=50)
Development
# Install
uv sync
# Run MCP server
uv run skill-retriever
# Run tests
uv run pytest
# Type check
uv run pyright
# Lint
uv run ruff check
Related Resources
- DeepLearning.AI Agent Skills Course — Official course covering skill creation, Claude API, Claude Code, and Agent SDK
- anthropics/skills — Official Anthropic skills repository
- Agent Skills Specification — Open standard documentation
License
MIT