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Opentakeoff
Open-source (AGPL-3.0) PDF takeoff for construction & flooring — the first engine an AI agent drives natively over MCP, not bolted on. Rooms measured on the wall faces, symbol…
Install
$
npx -y opentakeoff-mcpClaude Code
claude mcp add opentakeoff -- npx -y opentakeoff-mcpCursor / Claude Desktop (mcp.json)
{
"mcpServers": {
"opentakeoff": {
"command": "npx",
"args": [
"-y",
"opentakeoff-mcp"
]
}
}
}Install command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →OpenTakeoff
The measurement engine for building plans—built so an AI agent can drive it, and so an estimator wants to.
A takeoff is the act of measuring quantities off a construction drawing. OpenTakeoff does it two ways over one engine: 53 MCP tools for an agent, and a browser canvas for a person. Agents and people share the takeoff document and quantity calculations. Each sheet carries its calibration; measurements carry geometry, method and authorship. Recalibration updates quantities together, incompatible imports report scale conflicts, and agent measurements carry an explicit review status. See the Phase 1 test guide.
For agents · Try the canvas · The engine's contract · For the person at the canvas · The data layer · Research · Fork it · Contribute
The two manuals: agent manual · user manual
Protocol work: Takeoff Protocol draft and compatibility status—formalizing existing records; current takeoff behavior is unchanged.
Read this in: 日本語 · 한국어 · 简体中文
Watch it: an autonomous agent runs a takeoff, live, no cuts (2:47) · hospital finish plan → report in about a minute (1:14) · canvas walkthrough (1:10) · One-Click Area (0:51)
One-Click Area is temporarily gated. The flood engine is being re-validated against a wider plan corpus. Until that finishes the One-Click tool is off the canvas rail (
Oreports the gate) and theone_click/detect_roomsMCP verbs are not registered (a default build ships 53 tools). Trace rooms with Area (A) in the canvas andmeasure_polygonover MCP; every other tool, sweep and derivation is unchanged. A build lifts the gate withVITE_ONE_CLICK=1(canvas) /OPENTAKEOFF_ONE_CLICK=1(server). Sections and videos below that show One-Click describe the engine as it returns — seedocs/design/ONE_CLICK_GATE.md.
The Premium workspace offers compact controls, searchable actions and sheets, personal panel arrangements, adjustable surfaces and larger sheet previews. It is the default when this browser has no saved layout choice; Classic layout remains available. See the workspace design and research.
Sheet navigation releases closed PDFs and embedded fonts from the tile workers; see the 30-flip rendering check. Beyond the PDFs in open tabs, at most four idle PDFs stay loaded (two on a phone or tablet, or a browser that reports 4 GB of memory or less), least recently used out first; see the 12-PDF check.
Start here
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