Release Arbor v2.4.0 — "The Agent-Native Leap" · Anandb71/arbor · GitHub

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arbor

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Arbor v2.4.0 — "The Agent-Native Leap"

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Anandb71

released this

07 Jul 21:21

v2.4.0

7cd5638

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

get_blast_radius — real git-diff blast radius analysis (replaces stub)

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<br># POST http://127.0.0.1:3333/mcp<br># 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 · MCP Registry

🤖 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<br>claude mcp list

In Claude Code, run:

/mcp

Cursor MCP config (.cursor/mcp.json)

"mcpServers": {<br>"arbor": {<br>"command": "arbor",<br>"args": ["bridge"]

VS Code MCP config (.vscode/mcp.json)

"servers": {<br>"arbor": {<br>"type": "stdio",<br>"command": "arbor",<br>"args": ["bridge"]<br>},<br>"inputs": []

MCP Directories

Glama: https://glama.ai/mcp/servers/@Anandb71/arbor

Skills Playground: https://skillsplayground.com/mcps/nandb71-arbor/

Arbor v2.4.0

Installation

# Cargo<br>cargo install arbor-graph-cli --version 2.4.0

# Homebrew (macOS/Linux)<br>brew install Anandb71/tap/arbor

# Scoop (Windows)<br>scoop bucket add arbor https://github.com/Anandb71/arbor<br>scoop install arbor

# npm<br>npx @anandb71/arbor-cli

# Docker<br>docker pull...