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Bucky MCP server

Which servers in the official MCP registry are Bucky's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-20

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Whose server it is
  • Registry namecom.buckybuild/buckyverified in the MCP registry

The registry name sits under buckybuild.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-20
  • Stateanswerschecked 2026-10-20
  • Tools15
  • Server calls itselfbucky
  • Server version1.2.0
  • Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 177 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 4 of the 7 days it takes to judge reliability.

Once connected

  • For "check zoning and lot dimensions for a given address", the likely first call is getFeasibilitySnapshot.
  • Keep approval on for removeSavedFolderItem: they delete, send or pay without saying so.
  • createSavedFolder, deleteSavedFolder, addSavedFolderItem, removeSavedFolderItem, updateProject change data without a sign-in: anyone with the address can call them.
  • Its definitions take about 19280 tokens of context: enable only the tools a task needs.
  • Parameters are untyped or undescribed in 15 of 24 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 4, the first on 2026-10-20
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
  • Answeredmeasuring4 of the 7 daily checks it takes to print a share
  • Median first answer220 ms
  • Space in an agent's context≈ 19,280 tokensthe definitions of all its tools (24), which an agent carries on every turn
  • Tool definitionsA · 90 of 100
  • Typed results0 of 24 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 15 of 24

What an agent can do with it

  • can do · check zoning and lot dimensions for a given address
  • not sure · screen a region's lots for those that fit zoning
  • not sure · ask whether an accessory home is allowed on a lot

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

  • Tools that delete, send or pay without telling the client so: removeSavedFolderItem
  • Tools that change data, on a server that answers without a sign-in: createSavedFolder, deleteSavedFolder, addSavedFolderItem, removeSavedFolderItem, updateProject

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers15 tools · read 2026-10-20
  • getBuckyMcpGuide

    Call with no arguments on first contact. Optional `role`, `market`, and `scale` answer the first-call questions on a second call. Returns what this session should do next.

  • explainFeasibilityStatus

    Explain one Bucky coverage or per-fact provenance status and the safe next action. This is a pure static lookup: it does not inspect an address, retrieve property data, or call a database, geocoder, AI model, or third-party API. Accepts…

  • getFeasibilitySnapshot

    Look up lot, zone, and building envelope for one street address in Canada or the US. Pass `address`. One address per call; cannot search or compare. Every envelope value carries a `status`. Never report `not_extracted` or…

  • getBylawSection

    Return the stored bylaw section text behind a snapshot citation. Pass `sectionIds` copied from `citations.*.knowledgeSectionId` on getFeasibilitySnapshot. Or pass `geoDivisionId` from `coverage.geoDivisionId`, `zoneCode` from `zone.code`…

  • screenLots

    Find the lots in one live Bucky city that match a buy box. Pass `city` or `geoDivisionId` with `thesis` (plain words), `criteria` (square feet, dollars), or both; or pass a saved `profileId`. Returns countOutcome (exact, partial, or…

  • runFeasibilityAnalysis

    Enqueue a fresh deterministic analysis run for a saved project. Pass `projectId`, or `project` with the name the user said; with neither, the result lists their projects and nothing is queued. Returns immediately with `agentStatus`…

  • getProjectContext

    Load one project with analysis envelope, compact agentStatus, document summaries, evidence summaries, the project memory digest, and external_ref when the project was imported from another system. Pass `include` for optional sections…

  • saveToProject

    Create a project (`create`), attach lots (`attach_parcels`), or attach a knowledge reference (`attach_reference`). Pass `projectId` or `project`; with neither, the result lists projects and writes nothing. For attach_parcels, pass a WGS84…

  • updateProject

    Patch project metadata (name, lifecycle status, externalRef). Pass `projectId`, or `project` with the name the user said; with neither, the result lists their projects and nothing is written. preview=true returns the field-level diff and…

  • setProjectMapListing

    Put a project on the public Bucky map, or take it off. Pass `projectId`, or `project` with the name the user said; with neither, the result lists their projects and nothing is published. Listing publishes the build-lot centroid, the…

  • produceProjectReport

    Compose a project report PDF. Pass `projectId` or `project`; with neither, the result lists projects and no meter is spent. preview=true composes without spending. confirm=true exports, spends records.exports, and is irreversible. Returns…

  • submitBuckyFeedback

    Open a human-reviewed feedback form and submit it to the Bucky product team. Call only when the user explicitly asks to send feedback, report a problem, suggest an improvement, or praise something. The server asks the MCP client to show…

  • previewSiteCoverage

    Free preview, no sign-in needed. For one street address in Canada or the US, it says whether Bucky covers the place and which zoning facts it holds for the lot (lot boundary, zone, height, density, setbacks, permitted uses, overlays…

  • cityInventory

    Public city catalogue inventory. Pass exactly one of: cityName, lat and lng together, or geoDivisionId. A city name with multiple matches returns choices; after the user chooses, call again with that candidate geoDivisionId. Never pass a…

  • uiGetAnalysisStatus

    Return only the analysis `agentStatus` for a project. Cheap enough to poll. Used by the Bucky app view; the model should call getProjectContext instead.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "bucky": {
      "type": "http",
      "url": "https://buckybuild.com/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http buckybuild https://buckybuild.com/api/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://buckybuild.com/api/mcp as a custom connector in the settings.

OpenAPI spec

16 paths, read 2026-10-20. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.