POB-MCP

pob-mcp is an MCP server. It lets an LLM load, inspect, change, and improvePath of Exile 2builds. It uses the real calculation engine fromPath of Building Community (PoE2 fork). It does not reimplement that engine.

MCP client (Claude Desktop, Cursor, ...) | MCP over stdio v pob-mcp (Python) -- tools_.py, optimizer/ | JSON-RPC over stdio v lua/pob_bridge.lua (running under luajit) | dofile() v Path of Building - PoE2's own Lua source (Launch.lua, Main.lua, ...)

git clone <this repo, or wherever you put pob-mcp> pob-mcp cd pob-mcp uv sync

git clone <this repo, or wherever you put pob-mcp> pob-mcp cd pob-mcp python -m venv .venv .venv/bin/pip install -e . # Windows: .venv\Scripts\pip install -e .

POB_MCP_SOURCE_DIR=/path/to/PathOfBuilding-PoE2 uv run pob-mcp # or, against an installed release: POB_MCP_INSTALL_DIR="C:\Users\you\AppData\Roaming\Path of Building Community (PoE2)" uv run pob-mcp

POB_MCP_SOURCE_DIR=/path/to/PathOfBuilding-PoE2 .venv/bin/pob-mcp # Windows: .venv\Scripts\pob-mcp.exe

{ "mcpServers": { "pob-mcp": { "command": "uv", "args": ["--directory", "/absolute/path/to/pob-mcp", "run", "pob-mcp"], "env": { "POB_MCP_SOURCE_DIR": "/absolute/path/to/PathOfBuilding-PoE2" } } } }

{ "mcpServers": { "pob-mcp": { "command": "uv", "args": ["--directory", "C:\\path\\to\\pob-mcp", "run", "pob-mcp"], "env": { "POB_MCP_INSTALL_DIR": "C:\\Users\\you\\AppData\\Roaming\\Path of Building Community (PoE2)" } } } }

{ "mcpServers": { "pob-mcp": { "command": "C:\\path\\to\\pob-mcp\\.venv\\Scripts\\pob-mcp.exe", "env": { "POB_MCP_INSTALL_DIR": "C:\\Users\\you\\AppData\\Roaming\\Path of Building Community (PoE2)" } } } }

- The optimizer never changes configuration options(buffs, curses, enemy stats, map mods). If it could, it could raise its own score by assuming an unrealistic scenario. Callset_configyourself first if you want to optimize for one specific scenario.
- Item and jewel search only uses PoB's local database.Theitemsscope ofoptimize_buildtries items from PoB's own bundled unique database, for the same slot. It doesn't check trade-site prices, and it doesn't search rare-item crafting options.
- The optimizer doesn't search jewels on its own.Matching a jewel to the right socket isn't reliable enough yet. You can still try a specific jewel by hand: uselist_uniques_for_slot, thenequip_item_raw.
- The optimizer is a greedy search, not a perfect solver.It only adds tree nodes — it never removes or replaces existing ones — and it only swaps one gem or item at a time. It can get stuck on a good-but-not-best answer that a wider search might beat.
- pob-mcp can't import a live poe.ninja character profile.It can import a poe.ninjapob-linkjust like any other supported site, but a live character profile is different: it needs the official character API, and this version doesn't talk to that API yet. Export the character to a PoB code or link first, and use that instead.
- pob-mcp doesn't watch your Builds folder for changes.list_local_buildslists what's there when you call it. It doesn't push updates when something changes. For an LLM-driven session, calling the tool again is simpler, and works just as well.

cd /path/to/PathOfBuilding-PoE2/src luajit /absolute/path/to/pob-mcp/lua/pob_bridge.lua

{"id": 1, "method": "new_build", "params": {}} {"id": 2, "method": "get_stats", "params": {}}

pob-mcp/ lua/ json.lua # self-contained JSON codec for the bridge protocol pob_bridge.lua # the headless PoB bridge + JSON-RPC loop src/pob_mcp/ server.py # MCP server entrypoint, tool registration bridge.py # subprocess + JSON-RPC client for pob_bridge.lua locate.py # finds a PoB install + luajit sites.py # pobb.in/Maxroll/poe.ninja/etc. URL -> build code importers.py # unifies code/URL/file/XML into one load_build path tools_.py # MCP tool definitions, grouped by area optimizer/ # goal-directed build search tests/

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