pensketch MCP server

by alpha-nu·io.github.alpha-nu/pensketch·v0.13.0

An MCP server for pensketch: check, render and rasterise hand-sketched diagrams.

A92/100grade A

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A92/100

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If you have run it, two minutes of your experience saves the next person an afternoon.

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

check_diagram
get_schema
Returns the JSON Schema for the diagram the drawing tools take: every field of a node, an edge, a brace and a note, with what each means. The same document as the pensketch://schema resource, as a tool, for clients that cannot read resources. Call it once per session at most - it changes only when the server version does; this build is @pensketch/mcp 0.13.0. Every mismatch is also reported field b
render_diagram
Returns SVG markup for a diagram, and beside it the layout findings for the drawing it just made: overlapping boxes, text too wide for its box, a node out of frame. Two content blocks: the markup alone, then the findings - when saving to a file, write the first block only, because anything appended after </svg> makes the file invalid. Deterministic: the same diagram and seed produce the same bytes
render_png
Rasterizes a diagram so it can be displayed. … … Scale is capped at …, and an oversized request is refused rather than served.

scanner v0.1.5 · 2026-09-19 · same rubric, same numbers if you re-run it

no findings

Code scan23 source files scanned25/25
–Live reliabilityno gateway calls yet and no remote to proben/a
–Tool poisoningtools not inspected (local package is not executed); not countedn/a
Auth qualitylocal package, no credentials required12/15
Maintenancelast push 0 days ago15/15
Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Overall 92/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

Runs npx -y @pensketch/mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add pensketch -- npx -y @pensketch/mcp

Is pensketch MCP server safe?: Yes, by our scan: it is graded A (92/100). Read the pensketch safety report
How do I install pensketch?: It runs on your machine. Copy the Claude Code, Claude Desktop or Cursor config from the install section.
Does pensketch need an API key?: Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is pensketch maintained?: The last commit was 2 days ago (2026-09-19). The latest release is v0.13.0.