slm-graph

name	slm-graph
description	Index and query a codebase as a structural graph — build the code graph, trace blast radius of a change, find callers/callees/inheritors, semantic code search by meaning, assemble PR review context, and detect what changed since last index. Use when the user asks how code connects, what breaks if X changes, what calls a function, what a class inherits from, how to navigate an unfamiliar codebase, or to understand risk before editing.
when_to_use	- what calls X - what breaks if I change Y - what does Z inherit from - find code that handles authentication - impact analysis before editing - code navigation in unfamiliar repos - blast radius before a PR - pre-commit change detection
allowed-tools	build_code_graph, query_graph, get_blast_radius, semantic_search_code, get_review_context, detect_changes, Bash

slm-graph — Code Intelligence Skill

Index any repo as a code knowledge graph and answer structural questions about it: callers, callees, impact radius, semantic search, and review context. Requires the code MCP profile (set SLM_MCP_PROFILE=code in your plugin .mcp.json).

Prerequisite rule: every tool except build_code_graph self-guards — if the graph is not built it returns {"success": false, "error": "Code graph not built. Run build_code_graph first."}. Always index first.

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Tool Reference

1. build_code_graph — index a repository

build_code_graph(
    repo_path: str,
    languages: str = "",
    exclude_patterns: str = "",
) -> {success, files_parsed, nodes, edges, flows, communities, duration_ms}

Parses all supported source files, extracts functions/classes/imports, builds the call graph, detects execution flows, and identifies code communities. Replaces any previous index for the same repo.

• repo_path — absolute path to the repository root. Must exist.
• languages — comma-separated language filter, e.g. "python,typescript". Empty string = index all supported languages.
• exclude_patterns — comma-separated glob patterns to exclude, e.g. "**/node_modules/**,**/.venv/**". Empty = no exclusions.

When to (re)build:

• Before using any other graph tool for the first time on a repo.
• After significant changes to the codebase (pull, merge, large refactor).
• When detect_changes or query_graph returns stale/unexpected results.
• Rebuild is safe and idempotent — it replaces the previous index atomically per file.

# Index the full repo
build_code_graph(repo_path="/abs/path/to/myrepo")

# Index only Python, skip tests and generated code
build_code_graph(
    repo_path="/abs/path/to/myrepo",
    languages="python",
    exclude_patterns="**/tests/**,**/generated/**"
)

---

2. query_graph — traverse relationships

query_graph(
    pattern: str,
    target: str = "",
    limit: int = 20,
) -> {success, pattern, target, results: [{qualified_name, kind, file_path, name}]}

Query the graph for structural relationships. pattern is required and must be one of the eight valid values below. target is a qualified name, partial name, or node ID — matched with exact-then-LIKE fallback.

Valid patterns:

pattern	returns
callers_of	functions/methods that call target
callees_of	functions/methods that target calls
imports_of	modules/symbols that target imports
imported_by	who imports target
tests_for	test nodes associated with target
inherits_from	base classes of target
inherited_by	subclasses of target
contains	symbols defined inside target (e.g. methods in a class)

# Who calls the auth handler?
query_graph(pattern="callers_of", target="authenticate_user")

# What does the payment processor import?
query_graph(pattern="imports_of", target="PaymentProcessor", limit=30)

# What classes inherit from BaseModel?
query_graph(pattern="inherited_by", target="BaseModel")

---

3. get_blast_radius — impact analysis

get_blast_radius(
    changed_files: str,
    max_depth: int = 2,
    max_nodes: int = 500,
) -> {success, changed_nodes, impacted_nodes, impacted_files, edges, depth_reached, truncated}

Computes the full impact radius for one or more changed files using bidirectional BFS (callers and callees). Returns every node and file reachable within max_depth hops. Use this before editing to understand risk surface.

• changed_files — comma-separated file paths relative to the repo root, e.g. "src/auth/handler.py,src/auth/models.py".
• max_depth — BFS depth. Default 2. Increase to 3–4 for deep call chains; lower to 1 for a quick first-degree check.
• max_nodes — caps the result set. If truncated=true in the response, the real blast radius is larger.

# What breaks if I change the auth handler?
get_blast_radius(changed_files="src/auth/handler.py")

# Deeper analysis across two files
get_blast_radius(
    changed_files="src/payments/gateway.py,src/payments/models.py",
    max_depth=3,
    max_nodes=200
)

If truncated is true, narrow the scope with max_nodes or reduce max_depth to get a reliable result.

---

4. semantic_search_code — find code by meaning

semantic_search_code(
    query: str,
    kind: str = "",
    limit: int = 20,
) -> {success, results: [{qualified_name, kind, file_path, score, line_start, name}]}

Hybrid FTS5 + vector search over all indexed code entities. Use when you know what the code does but not what it's called.

• query — natural language description, e.g. "retry logic for HTTP requests" or "parse JWT token from header".
• kind — optional filter: "Function", "Class", "File", or "Test". Empty = all kinds. Case-insensitive match in the engine.
• limit — max results. Default 20.

Results include a score field (higher = more relevant).

# Find where authentication is handled
semantic_search_code(query="authenticate user from request token")

# Find only test functions that cover database writes
semantic_search_code(query="database write transaction rollback", kind="Test")

# Find the rate limiter class
semantic_search_code(query="rate limiting middleware", kind="Class", limit=5)

---

5. get_review_context — assemble PR review context

get_review_context(
    changed_files: str,
    include_source: bool = True,
) -> {success, summary, review_items, test_gaps, risk_score}

Produces a token-optimized review package for a set of changed files: a plain-language summary, a ranked list of review items with per-node risk scores, and a list of changed symbols that have no associated test coverage.

• changed_files — comma-separated file paths relative to the repo root.
• include_source — whether to include source code snippets in the context (default True). Set False to reduce token usage when you only need the risk analysis.

risk_score is a float 0–1 on the overall changeset. review_items[].risk_score is per-node.

# Get review context for a PR touching two files
get_review_context(changed_files="src/auth/handler.py,src/auth/utils.py")

# Risk summary only, no source snippets
get_review_context(
    changed_files="src/payments/gateway.py",
    include_source=False
)

---

6. detect_changes — what changed since last index

detect_changes(
    base: str = "HEAD~1",
) -> {success, summary, risk_score, changed_functions, test_gaps, review_priorities}

Runs git diff against base, maps the changed hunks to graph nodes, and returns a risk-scored list of changed functions, test gaps, and review priorities. Requires the repo to be a git repository.

• base — git ref to diff against. Default "HEAD~1" (one commit back). Any valid git ref works: "main", "v3.6.13", a commit SHA, etc.

# What changed in the last commit?
detect_changes()

# What changed since the release branch?
detect_changes(base="release/v3.6.13")

# What changed relative to main?
detect_changes(base="main")

Returns error if the repo root is not a git repository or if git is not available.

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Realistic Workflow

Explore an unfamiliar codebase

# 1. Index it
build_code_graph(repo_path="/abs/path/to/repo")

# 2. Find the entry point by meaning
semantic_search_code(query="request router entry point", kind="Function")

# 3. Trace what it calls
query_graph(pattern="callees_of", target="handle_request")

# 4. See who else calls the same core function
query_graph(pattern="callers_of", target="authenticate_user")

Before editing a function

# 1. Know what you are touching
semantic_search_code(query="retry HTTP requests with backoff")

# 2. Understand blast radius before making the change
get_blast_radius(changed_files="src/http/client.py")

# 3. Check test gaps
get_review_context(changed_files="src/http/client.py")

Pre-commit / PR review

# 1. What changed in this branch vs main?
detect_changes(base="main")

# 2. Full impact analysis for the changed files
get_blast_radius(changed_files="src/auth/handler.py,src/auth/models.py")

# 3. Assemble review context
get_review_context(changed_files="src/auth/handler.py,src/auth/models.py")

---

Error Handling

All tools return {"success": false, "error": "<message>"} on failure — they never raise.

Error message	Cause	Fix
Code graph not built. Run build_code_graph first.	No index exists	Call build_code_graph(repo_path=...) first
Repository path does not exist: <path>	Bad repo_path in build	Pass an absolute path that exists
Git not available or not a git repository: ...	detect_changes needs git	Only works in git repos with git installed
Invalid pattern '...'	Wrong pattern in query_graph	Use one of the 8 valid pattern strings
No node found matching '<target>'	Target not in index	Rebuild or check the qualified name via semantic_search_code

If build_code_graph returns files_parsed: 0, no supported source files were found — check repo_path and exclude_patterns.

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Profile Requirement

This skill uses graph tools that are only active under the code MCP profile (or full / power). Your plugin .mcp.json must include:

"env": {
  "SLM_MCP_PROFILE": "code",
  "SLM_AGENT_ID": "codex"
}

Without this, the six graph tools are not registered and will appear as unknown tools. Run slm status to confirm the active profile.

Switching profiles at runtime (v3.8.0+): Use switch_profile("code") via MCP to activate the code profile in a session that started with a different profile. See slm-profile for the full profile switching workflow.

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Related skills

• slm-profile — workspace isolation and profile switching (required for code tools)
• slm-recall — retrieve architectural decisions before graph queries
• slm-status — confirm the active profile and graph index health

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SuperLocalMemory v4.1.11 · Qualixar · AGPL-3.0-or-later