Show HN: Arbor – code graph MCP server so agents stop grep-reading your codebase

Arbor v2.4.0, a code graph MCP server, was released in July 2026 with support for the MCP 2026-07-28 protocol, Tasks extension, MCP Apps for interactive UI, and Streamable HTTP transport. The update enables AI agents to efficiently navigate codebases using code graphs instead of grep-based reading.

Arbor v2.4.0 — The Agent-Native Leap Release date: July 2026 First code-graph MCP server built for MCP 2026-07-28 . What's New MCP 2026-07-28 Protocol - Protocol version 2026-07-28 with dual-version fallback for 2025-03-26 clients - Stateless server/discover endpoint - Response caching metadata ttlMs , cacheScope on list/read operations - Extensions capability map for Tasks and MCP Apps Tasks Extension tasks/get , tasks/update , tasks/cancel for long-running operations- Background indexing returns task handles instead of errors during cold start - Agents poll task progress while the graph builds MCP Apps SEP-1865 - Interactive blast-radius graph UI ui://arbor/blast-radius - Interactive architecture map UI ui://arbor/architecture-map analyze impact and get architecture overview declare meta.ui resource URIs Streamable HTTP Transport arbor bridge --http --port 3333 - Stateless HTTP alongside stdio Mcp-Method / Mcp-Name header routing- Deploy behind load balancers for remote/enterprise use Tool Quality — real git-diff blast radius analysis replaces stub get blast radius Pagination on search symbols and get map offset , limit , hasMore - Async tokio stdio replaces blocking stdin loop Benchmarks - Criterion suite: cargo bench -p arbor-graph - CI regression gate via .github/workflows/benchmarks.yml - Updated docs/BENCHMARKS.md with token-savings methodology Upgrade Guide MCP clients Claude / Cursor — no changes required for stdio: claude mcp add --transport stdio --scope project arbor -- arbor bridge HTTP clients new : arbor bridge --http --port 3333 POST http://127.0.0.1:3333/mcp Headers: Mcp-Method: tools/call, Mcp-Name: analyze impact Clients on 2025-03-26 keep working. Clients on 2026-07-28 get Tasks, Apps, caching, and pagination. Full Changelog Added - MCP 2026-07-28 protocol: server/discover , meta parsing, response caching, dual-version fallback - Tasks extension: tasks/get , tasks/update , tasks/cancel - MCP Apps: blast-radius graph + architecture map HTML templates - Streamable HTTP: arbor bridge --http --port 3333 - Real get blast radius via shared arbor-graph::compute blast radius - Pagination on search symbols and get map - Criterion benchmarks + CI workflow Changed - Async MCP stdio tokio replaces blocking stdin loop - MCP tool annotations: meta.ui on analyze impact and get architecture overview - Workspace version bumped to 2.4.0 Deferred to v2.5.0 - Parallel rayon indexing - Incremental PageRank - Unified parser pipelines - Process-level graph daemon Install: cargo install arbor-graph-cli · GitHub https://github.com/Anandb71/arbor · MCP Registry https://github.com/modelcontextprotocol/servers 🤖 Arbor MCP Quick Install Use Arbor as a local MCP server in your AI client: Claude Code project-scoped claude mcp add --transport stdio --scope project arbor -- arbor bridge claude mcp list In Claude Code, run: /mcp Cursor MCP config .cursor/mcp.json { "mcpServers": { "arbor": { "command": "arbor", "args": "bridge" } } } VS Code MCP config .vscode/mcp.json { "servers": { "arbor": { "type": "stdio", "command": "arbor", "args": "bridge" } }, "inputs": } MCP Directories - Glama: https://glama.ai/mcp/servers/@Anandb71/arbor https://glama.ai/mcp/servers/@Anandb71/arbor - Skills Playground: https://skillsplayground.com/mcps/nandb71-arbor/ https://skillsplayground.com/mcps/nandb71-arbor/ Arbor v2.4.0 Installation Cargo cargo install arbor-graph-cli --version 2.4.0 Homebrew macOS/Linux brew install Anandb71/tap/arbor Scoop Windows scoop bucket add arbor https://github.com/Anandb71/arbor scoop install arbor npm npx @anandb71/arbor-cli Docker docker pull ghcr.io/anandb71/arbor:v2.4.0 Assets | Platform | Architecture | File | |---|---|---| | Linux | x86 64 | arbor-linux-x86 64.tar.gz | | Linux | aarch64 | arbor-linux-aarch64.tar.gz | | macOS | x86 64 | arbor-macos-x86 64.tar.gz | | macOS | Apple Silicon | arbor-macos-aarch64.tar.gz | | Windows | x86 64 | arbor-windows-x86 64.zip | What's Changed Full Changelog : v2.3.0...v2.4.0