Git Mimir

Mimir is a Go-based code intelligence engine that indexes your repository into a knowledge graph and exposes it to AI agents via MCP, HTTP API, and an interactive web UI.

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What is Mimir?

Mimir builds a searchable knowledge graph of your codebase that helps AI agents (and humans) understand it faster.

Use Case	How Mimir Helps
AI Agents (MCP)	7 tools for semantic search, impact analysis, and blast radius queries
Humans (Web UI)	Interactive force-directed graph to explore code structure visually
Teams (Refactors)	Impact analysis before editing — see what breaking changes affect

Why Mimir?

Metric	GitNexus (Node.js)	Mimir (Go)
Cold index (1,000 files)	~45s	< 8s
Incremental re-index	~45s (full)	< 2s
Hybrid search latency	~300ms	< 80ms
Binary size	350 MB	< 20 MB
RAM during index	~800 MB	< 120 MB

Key improvements: Pure Go (zero CGO), 8-language support (TS, JS, Go, Python, Rust, Java, C, C++), incremental indexing via git-diff, Louvain community detection, embedded web UI.

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Quick Start

Step 1: Install

# One-line (Linux/macOS)
curl -fsSL https://raw.githubusercontent.com/thuongh2/git-mimir/main/install.sh | sh

# Or via Go
go install github.com/thuongh2/git-mimir/cmd/mimir@latest

# Or download binary from GitHub Releases

Step 2: Index Your Code

# Full index with embeddings (requires ollama or OpenAI)
mimir analyze /path/to/your-project

# Faster — graph + BM25 only (no embeddings)
mimir analyze --skip-embeddings /path/to/your-project

# Skip auto-setup for manual control
mimir analyze --skip-daemon --skip-hooks --skip-skills /path/to/your-project

Step 3: Use It

Option A: Web UI (Humans)

mimir serve
# Open http://localhost:7842

Option B: MCP (AI Agents)

mimir daemon start    # Start background MCP server
mimir setup           # Auto-configure Claude Code, VS Code, Cursor, etc.

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Installation

Method	Command
One-line (Linux/macOS)	`curl -fsSL https://raw.githubusercontent.com/thuongh2/git-mimir/main/install.sh
Go Install	go install github.com/thuongh2/git-mimir/cmd/mimir@latest
Download Binary	GitHub Releases
From Source	git clone && cd git-mimir && make build

For detailed installation guide, see docs/installation.md.

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CLI Reference

Command	Description
mimir analyze <path>	Index repository with auto-setup
mimir serve	Start HTTP server + Web UI (default: port 7842)
mimir mcp	Start MCP stdio server
mimir daemon start/stop/status	Manage background MCP daemon
mimir daemon logs [lines]	View daemon logs (default: 30 lines)
mimir list	List indexed repositories
mimir status [name]	Show index status
mimir clean <name>	Remove index for a repository
mimir setup	Configure MCP in all supported editors
mimir wiki [name]	Generate wiki from knowledge graph

Analyze Flags

mimir analyze --skip-embeddings <path>   # Skip embeddings (faster)
mimir analyze --skip-daemon <path>       # Don't start MCP daemon
mimir analyze --skip-hooks <path>        # Don't install Claude Code hooks
mimir analyze --skip-skills <path>       # Don't install agent skills
mimir analyze --force <path>             # Force full re-index
mimir analyze --incremental <path>       # Force incremental mode
mimir analyze --hint <file> <path>       # Hint for faster patch planning

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MCP Tools

AI agents get access to 12 tools via MCP:

Tool	Description	Example
query	Hybrid search (BM25 + vector)	"Find all auth-related processes"
context	360-degree symbol view	"Show handleRequest definition and callers"
find_referencing	Who directly calls/imports/extends a symbol (1-hop)	"What calls UserService.GetUser?"
symbol_coordinates	Exact file path + line range for a symbol	"Where is ProcessOrder defined?"
get_symbols_overview	All top-level symbols in a file, sorted by line	"What's exported from store.go?"
impact	Blast radius analysis	"What breaks if I change UserService?"
detect_changes	Analyze uncommitted git changes	"What processes did my commit affect?"
rename	Plan coordinated multi-file rename	"Rename AuthController to SessionController"
cypher	Raw graph queries	"Find unused exported functions"
list_repos	List all registered repositories	—
query_repo	Run a read-only tool against a different repo	"Query symbols in repo B from repo A"

Recommended Workflow

1. Discovery: Use query() for semantic search
2. Deep Dive: Use context() to understand a symbol
3. Find callers: Use find_referencing() for a lightweight 1-hop caller list
4. Understand a file: Use get_symbols_overview() to see what's defined in a file
5. Before Editing: Run symbol_coordinates() to get the exact location, then impact() for blast radius
6. Cross-repo: Use list_repos() to discover repos, then query_repo() to query them

For detailed usage, see docs/guide.md.

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Testing MCP Tools Locally

Use MCP Inspector — the official browser-based UI for exploring and calling MCP tools interactively:

# Build first
make build

# Index the current repo
./bin/mimir analyze .

# Launch MCP Inspector (requires Node.js)
npx @modelcontextprotocol/inspector ./bin/mimir mcp

Then open http://localhost:5173 in your browser. You can browse all 12 tools, fill in arguments via a form, and see the JSON responses in real time.

Alternatively, test via raw stdin:

# List all tools
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | ./bin/mimir mcp

# Call a tool
echo '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"list_repos","arguments":{}}}' | ./bin/mimir mcp

# Query a symbol in the current repo
echo '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"query","arguments":{"q":"handleRequest"}}}' | ./bin/mimir mcp

# Cross-repo query: search for a symbol in a different repo
echo '{"jsonrpc":"2.0","id":4,"method":"tools/call","params":{"name":"query_repo","arguments":{"tool_name":"query","arguments":{"query":"auth"},"target_repo":"other-project","current_repo":"git-mimir"}}}' | ./bin/mimir mcp

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Auto-Analyze Features

Running mimir analyze automatically sets up:

1. MCP Daemon — Background server for persistent MCP availability
2. Editor Config — Auto-configures Claude Code, VS Code, Cursor, Windsurf, Zed, OpenCode
3. Claude Code Hooks — Pre-search (graph-augmented search) and post-write (auto re-index)
4. Agent Skills — 4 static methodology skills + dynamic module skills per cluster
5. Context Files — AGENTS.md and CLAUDE.md with live index statistics

Log location: ~/.mimir/mimir-mcp.log

For complete feature documentation, see docs/features.md.

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HTTP API

Method	Endpoint	Description
GET	/	Web UI
GET	/repos	List indexed repos
GET	/repo/{name}/graph	Full graph (nodes + edges)
GET	/repo/{name}/query?q=...	Hybrid search
GET	/repo/{name}/context/{symbol}	Symbol detail + edges
GET	/repo/{name}/impact/{target}	Blast radius analysis
GET	/repo/{name}/clusters	Louvain clusters
GET	/repo/{name}/processes	Execution flow traces
POST	/repo/{name}/cypher	Raw SQL query

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Documentation

Guide	Description
Installation	Detailed installation and setup
Usage Guide	Perfect workflow for daily use
Features	Complete feature reference
Architecture	System design and components
Algorithms	Louvain, BM25, HNSW details

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Tech Stack

Component	Technology
Language	Go 1.22+
AST Parsing	smacker/go-tree-sitter
Storage	modernc.org/sqlite (pure Go)
Vector Search	sqlite-vec (HNSW)
Text Search	Custom BM25
Clustering	Louvain algorithm
CLI	cobra
Web UI	Sigma.js v2 + Graphology

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Project Structure

mimir/
├── cmd/mimir/          # CLI entrypoint
├── api/                # HTTP server + embedded Web UI
├── mcp/                # MCP stdio server
├── internal/
│   ├── walker/         # File tree walker
│   ├── parser/         # AST parser (8 languages)
│   ├── resolver/       # Import/call resolver
│   ├── graph/          # Node/edge types
│   ├── store/          # SQLite layer
│   ├── embedder/       # Embedding pipeline
│   ├── cluster/        # Louvain detection
│   ├── process/        # Flow tracer
│   ├── incremental/    # Git-diff indexing
│   └── registry/       # Multi-repo registry
└── testdata/           # Test fixtures

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Contributing

Contributions welcome! See GitHub Issues for open tasks.

License: MIT