gograph

Give Go coding agents a compiler-aware map for safer refactors.

gograph builds a local structural graph of your Go repository, with optional type-checked CHA/SSA enrichment. Its CLI and MCP workflows help coding agents trace callers and interface implementations, plan change impact, and enforce architecture without embeddings or a hosted code index.

Static analysis; no target-code execution. Default indexing parses Go source locally and does not call application services. It also reads project metadata such as go.mod, .gitignore, graph/config JSON, and Git state. Precise mode and doc invoke the local Go toolchain, which follows your configured module/cache/network policy. Session telemetry is local under .gograph/sessions/; nothing is sent to gograph services.

Quick Start

# Install
brew install ozgurcd/tap/gograph
# or: go install github.com/ozgurcd/gograph/cmd/gograph@latest

# Build a fast AST graph, then verify it
gograph build .
gograph stats

# Start with repository-wide results that require no guessed symbol
gograph summary
gograph hotspot --top 5
gograph flow --no-tests

Homebrew and go install install the normal gograph CLI. MCP clients that support MCP Bundles can instead discover the local stdio server in the official MCP Registry as io.github.ozgurcd/gograph. Registry/MCPB installation is a separate distribution path; it does not install the Homebrew formula or configure the Claude Code marketplace plugin. The Registry is currently in preview. See Official MCP Registry and MCPB installation for client support, target selection, and current limitations.

Choose a real function or method shown by summary, hotspot, or gograph complexity, then substitute its name below:

gograph context "YourSymbol" # source + callers + callees + tests

# For compilable repositories, enrich the graph before a major refactor
gograph build . --precise
gograph plan "YourSymbol"

Build artifacts are written under the target .gograph/ directory. gograph adds .gograph/ to the enclosing Git repository root .gitignore when available, falls back to the build target .gitignore outside Git, and exits without replacing artifacts if no Go files are found or no source file parses successfully. Individual ignored files and ignored directories use the same scanner policy for building, freshness checks, and change detection.

Why gograph?

Illustrative point-in-time output comparison from an earlier gograph revision (counts vary as the repository evolves; these commands return different kinds of evidence):

Task	grep -rn	gograph	Observed output difference
Find callers of loadGraph	158 matching lines (comments, docs, vars)	56 AST-derived call-site rows	~65% fewer rows in that run
Locate symbol definitions	842 lines matching "Symbol"	83 true type/method declarations	~90% noise eliminated
Read one function body	cat displays 180+ lines of the whole file	source extracts the 12-line function	~93% fewer source lines in that run
Gather common symbol context	Separate node, source, caller, callee, and test queries	context bundles those fields	Five evidence types in one response

Key Features

61 Query and Analysis Capabilities — callers, callees, impact, context, plan, review, flow, errorflow, orphans, hotspot, coupling, and more. The MCP server registers 65 endpoints including four session lifecycle tools. Full command reference →

Native MCP Server — every query and analysis capability has an MCP endpoint for Claude, Cursor, Copilot, and other MCP clients. Host integration and CI artifact commands (build, gate, snapshot, plugin/hook installation, server startup, help, and version) remain CLI-only.

Explicit Freshness Model — CLI analysis reads the last persisted graph. MCP source-analysis tools check freshness per call, adopt a newer persisted precise graph, and rebuild in memory after edits using the latest requested analysis mode. MCP stale, default changes, and stats inspect the persisted snapshot.

Compact Composite Workflows — context, plan, and explain combine source and graph evidence that would otherwise require several separate queries. Actual tool-call and token savings depend on the repository and task.

Narrow by Design — never runs target repository binaries or tests and does not read .env, key, certificate, or credential files. AI worktree directories (.claude/, .cursor/, .agents/) are excluded. Precise analysis and external documentation use the installed Go toolchain.

Architecture Enforcement — boundary rules, API drift detection, complexity gates, dead code sweeps, god-object detection, coupling analysis. Run in CI with gograph gate.

Security Flow Analysis — flow follows potential HTTP request, decoded JSON, and environment data across assignments and function calls to SQL query text, process execution, filesystem paths, and outbound HTTP targets. Findings include severity, confidence, and source-to-sink path steps; MCP exposes the same analysis as gograph_flow.

Integrity-Aware Indexing — graph.json is atomically replaced only after a successful parse, records complete/partial build health and ast/precise/precise_fallback analysis status, and exposes both through gograph stats. gate refuses to evaluate a stale graph.

Agent Compliance Auditing — session telemetry tracks whether agents run plan before edits and review after. Grades agent behavior A–F with actionable recommendations.

Command Reference

Query and composed-analysis commands support --json; result-list queries also support --files-only. Operational commands such as build, wiki, gate, snapshot, sessions, installation, help, and version use text output.

Category	Commands	What it does
Indexing	build . [--precise], stale, stats	Parse AST, write graph. Check freshness. Index health.
Navigation	query, callers [--depth N], callees [--depth N], path, source, node	Find symbols, trace call chains, extract source.
Context	context, explain, focus, endpoint	Bundled structural data in one call. Token savers.
Change Analysis	plan, review, risk, impact [--uncommitted|--since], changes [--git], api --since	Pre-edit planning, post-edit review, risk analysis, blast radius, drift.
Architecture	boundaries, coupling, complexity, godobj, orphans, arity	Quality gates, dead code, coupling, god objects.
Types & Structs	fields, implementers [--test-only], interfaces, embeds, constructors, literals, usages, mutate, schema	Struct fields, interface satisfaction, type usage.
Infrastructure	routes, sql, envs, errors, concurrency, globals, httpcalls, deps [--transitive], dependents, imports	HTTP routes, SQL, env vars, concurrency, outbound HTTP calls, imports.
Security	flow [term] [--source kind] [--sink kind] [--config path] [--no-tests]	Potential untrusted-data paths to SQL, process, filesystem, and outbound HTTP sinks.
Testing	tests, fixtures, mocks	Test coverage map, helpers, mock implementations.
Error Tracing	errorflow [--no-tests], trace	Reverse-BFS from error strings to HTTP entry points.
Diagnostics	hotspot, returnusage, skeleton, diagram, changes, public	Hotspots, return usage, API signatures, Mermaid diagrams.
CI/CD	check [--since|--uncommitted], gate, snapshot save|diff|list|drop	Policy checks, threshold enforcement, metric snapshots.
Telemetry	session create|end|audit|cleanup	Agent compliance tracking and grading (A–F).
LLM-Wiki	wiki [--output dir]	Generate llm-wiki/ — machine-first markdown pages for zero-cost agent orientation (overview, architecture, hotspots, routes, env, errors, concurrency, per-package, API surface).
Summary	summary [--json]	Single-call codebase briefing: top 3 hotspots, worst instability package, highest complexity function, orphan count, god-object count. Replaces 5 separate calls.
Untested	untested [--pkg name] [--top N] [--json]	Functions with callers but zero test edges — coverage gaps invisible to orphans or per-symbol test queries. One sweep replaces N tests <sym> calls.
Doc	doc <pkg[.Symbol]> [--json]	go doc wrapper — signature + doc comment for any stdlib or third-party symbol. No graph required. Closes the gap when call chains leave the project.

Full command reference with examples: gograph.identuum.ai/docs/command-reference

Architecture Boundary Enforcement

Define boundaries in .gograph/boundaries.json:

{
  "layers": [
    { "name": "domain", "packages": ["internal/domain/**"], "may_import": [] },
    { "name": "handler", "packages": ["internal/handler/**"], "may_import": ["internal/service/**", "internal/domain/**"] }
  ]
}

Run gograph boundaries — exits with code 1 on violation. Works in CI/CD.

Security flow sanitizer policy

gograph flow includes test files by default; add --no-tests for production-only results. It automatically reads .gograph/flow.json when present, or accepts --config <path> for another JSON file inside the graph root. Sanitizers apply to a function's return value and can be scoped to selected sink kinds:

{
  "sanitizers": [
    { "function": "security.CleanPath", "for": ["filesystem"] },
    { "function": "security.ValidateURL", "for": ["outbound_http"] }
  ]
}

Omit for to trust the return value for every sink kind. function accepts the call spelling or a fully-qualified symbol ID; use the fully-qualified form when names collide. A validator that returns only bool or error does not sanitize the original input; wrap validation in a function that returns the trusted value if that is the intended policy.

AI Agent Integration

Official MCP Registry (preview): MCPB-capable clients can discover io.github.ozgurcd/gograph. The bundle asks for the root directory of the Go project and launches the bundled executable with separate arguments equivalent to gograph mcp <project-directory>. Releases provide macOS, Linux, and Windows bundles for both amd64 and arm64. The current Registry package schema cannot select by CPU architecture, so choose the asset whose filename matches the host; do not assume a client will select it automatically. All analysis still runs locally over stdio, with no hosted gograph service or remote telemetry.

Desktop config, shared rules, and Claude Code hook setup:

gograph add-claude-plugin

This registers the Claude Desktop MCP server, injects shared CLAUDE.md steering rules, and installs a Claude Code PreToolUse hook. For Claude Code MCP registration, also run the command printed by the installer: claude mcp add gograph -- gograph mcp .. The installer exits non-zero when any installation step fails.

Alternative — install via Claude Code plugin marketplace:

/plugin marketplace add ozgurcd/gograph
/plugin install gograph@gograph

Discovers gograph through Claude Code's plugin marketplace and ships a SKILL.md that auto-activates on Go work, teaching the agent the workflow (capabilities → build → plan → context → edit → build --precise → review), when to use structural queries, and when to verify with gopls or targeted text/source search.

You still need the gograph binary installed (brew install ozgurcd/tap/gograph or go install github.com/ozgurcd/gograph/cmd/gograph@latest). Use gograph add-claude-plugin for Claude Desktop MCP wiring plus shared rules and the Claude Code hook; register the Claude Code MCP server with the printed claude mcp add command. Use the plugin marketplace when you prefer discovery from Claude Code's plugin UI.

Other agents (Cursor, Copilot, Antigravity, etc.):

gograph mcp .   # Run as MCP server over stdio

Add to your .cursorrules or AI system prompt:

Before answering architecture or repository questions, inspect the available gograph_* MCP tools and run gograph capabilities. Prefer gograph for supported structural queries; use gopls or targeted source/text search when results are ambiguous, precision fell back, or a known source call is missing.

Query and composed-analysis commands support --json for machine-readable output:

gograph callers "YourSymbol" --json
# → {"schema_version": "1", "command": "callers", "status": "ok", "count": 2, "results": [...]}

For full integration guides, see docs/coding-agent-usage.md.

Zero-cost orientation with llm-wiki/: Run gograph wiki once per session to generate a directory of machine-first markdown pages — overview, architecture diagram, hotspots, routes, env vars, error sites, concurrency, per-package docs, and the full API surface. Agents read these pages instead of issuing dozens of individual tool calls:

gograph build . --precise
gograph wiki                 # writes to ./llm-wiki/
# then read: llm-wiki/README.md → project.md → rules.md → agent-contract.md → overview.md

Add llm-wiki/ to .gitignore — these files are regenerated each session.

Example Output

When you run gograph build ., the generated GRAPH_REPORT.md gives your AI a condensed context map:

External Dependencies (Tech Stack)

Module	Version
github.com/gin-gonic/gin	v1.9.1
github.com/jackc/pgx/v5	v5.5.5

Important Symbols (Top by outgoing calls)

Symbol	Kind	File	Line	Calls out
(Server).Start	method	server.go	42	18
ValidateAuth	function	auth.go	12	14

---

How does gograph complement gopls?

gopls is the Go project's compiler-backed language server. It provides live workspace diagnostics, navigation, references, implementations, refactoring support, and an experimental MCP server. It should remain the first choice for editor and compiler-aware workspace operations.

gograph adds a different layer for repository and agent workflows:

1. Persisted snapshots — CLI analysis can inspect a stable graph artifact, while MCP refreshes source-analysis state and preserves the requested precision mode.
2. Repository-level analyses — change impact, reachability, routes, SQL, environment reads, security-flow candidates, coupling, and policy gates are represented together.
3. Composed responses — context, plan, review, and summary package related evidence for agent workflows rather than exposing only one language operation at a time.

Use gopls for live compiler-backed navigation and refactoring, rg for text and non-Go searches, and gograph when a persisted repository graph or composed change-analysis workflow is useful. See the benchmark guidance for how to measure these different workflows without assuming one tool is a drop-in replacement for another.

Correctness model

• Default mode uses Go AST parsing and best-effort heuristics. Tolerates incomplete or non-compiling repositories.
• Precise mode attempts type-checked enrichment and needs compilable, build-selected packages for CHA/SSA results. If enrichment fails or omits an indexed non-test source file, the command warns, publishes the AST graph, and records precise_fallback; successful and AST-only builds record precise and ast respectively.
• Each precise interface invocation is represented by one call edge per valid named in-repository CHA target. callers Interface.Method (including methods inherited from embedded interfaces and concrete methods promoted from embedded fields) expands through the interface's implementers and reports a shared source expression once; concrete receiver notation and fully-qualified method IDs remain available for disambiguation. Compiler-generated promoted-method forwarding is stored as a traversal-only synthetic edge and is hidden from call-site output.
• CHA is conservative rather than points-to precise: it may retain implementations that cannot occur in one runtime configuration. Reflection, unsafe, plugins, unresolved function values, test-only packages, unnamed concrete types, and module-external implementations can still be incomplete.
• Callback references are retained only when they resolve to repository callables, and exact call edges are deduplicated before serialization.
• Mutation queries ignore ordinary local assignments and retain owning type information when statically known, so Type.Field disambiguates same-named fields.
• Synchronization extraction requires a receiver tied to a known sync type. Error messages come from panic, errors.New, and fmt.Errorf, including import aliases.
• Heuristic extractors (routes, SQL, tests, and error mapping) are navigation aids, not authoritative program analysis.
• Security flow analysis is interprocedural and path-insensitive, with call/return matching across up to 16 nested repository calls. Default graphs resolve direct local/imported functions; build . --precise supplies stronger method/interface targets. It does not model reflection, globals, arbitrary heap aliases, or every dynamic call. Unresolved external transformations are retained with low confidence; every finding requires source review.

Non-goals

• No multi-language parsing
• No AI/model API calls
• No embeddings or SaaS backend
• No remote telemetry or hosted analytics (optional audit sessions write local metadata only)
• No replacement for compiler/type-checker correctness

Contributing

Pull requests welcome! See CONTRIBUTING.md for build, test, and contribution guidelines.

Language Support: gograph currently parses Go only. The architecture is extensible — if you want to add Python, TypeScript, Rust, etc., please open an issue first.

License

MIT — see LICENSE.