What is cadkit-mcp CLAUDE.md?

Project instructions for cadkit-mcp, including how to use an Onshape MCP server, a connection for controlling or querying Onshape computer-aided design projects. They also define a five-step assembly workflow and verification rules.

Use them when working on Onshape assemblies in cadkit-mcp, especially when grounding parts, adding mates, checking positions, or testing motion.

They give an agent the project conventions and the order needed to build and check assemblies reliably.

How saltyeg/cadkit-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to saltyeg/cadkit-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/saltyeg/cadkit-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/saltyeg/cadkit-mcp

Made for: Claude Code.

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README.md

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Per session 530 This file is loaded in full into every session.

When invoked 530 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00530	$0.00530
Opus 5.5	$0.00212	$0.00212
Sonnet 5.5	$0.00106	$0.00106
Haiku 4.5	$0.00053	$0.00053

Measured 2mo ago against content hash b68d90f554ea, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cadkit-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 36 lines

How it starts

The opening of the file, as written. The whole thing — 36 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Onshape MCP Server

Project Conventions

PRs target main. main is the mainline branch.
Tests: pytest (all tests must pass). Coverage: pytest --cov (reported, not gated).
No enforced style/lint, type-checking, or coverage gate — only that tests pass.

Assembly Workflow (5-Step Methodology)

When building assemblies, follow this order:

Ground a reference part — First instance is grounded by default. All positions are relative to this part.
Get face IDs — Use get_body_details on the Part Studio. Face IDs are reusable across all instances of the same part.
Create mates in batches — Do 3-5 at a time, verify between batches with get_assembly_features (all OK?) and get_assembly_positions (positions correct?).
Verify positions relative to the reference part — Always compute instance_pos - reference_pos since the reference may not be at origin.
Test motion mates — Create slider/revolute mates without limits first. Verify direction and animation before adding limits.

See knowledge_base/assembly_workflow_guide.md for the full guide and examples/cabinet_assembly.md for a worked example.

Critical Assembly Gotchas

Instance order = direction: For slider/revolute/cylindrical mates, the first instance moves relative to the second. Swap the order to reverse the direction.
Limits can break the solver: API-set limits trigger a full re-solve that may flip parts. Create mates without limits first, add limits in the Onshape UI.
Fixed instances can't be moved: transform_instance and set_instance_position fail on grounded parts (API 400 error).
MC offsets are in local coords: Flipping the Z-axis changes all axes (right-hand rule), which changes how X/Y offsets map to world space.

Key File Paths

onshape_mcp/server.py — MCP server with all tool definitions
onshape_mcp/builders/mate.py — MateConnectorBuilder, MateBuilder
onshape_mcp/api/assemblies.py — Assembly API operations
knowledge_base/assembly_workflow_guide.md — Full assembly methodology
knowledge_base/cad/cad_best_practices.md — CAD design principles
examples/cabinet_assembly.md — Complete cabinet assembly walkthrough

Read the full file on GitHub · 36 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 36 lines · 530 tokens per session scan A b68d90f554ea

Subscribe to this mod's changes

cadkit-mcp CLAUDE.md is an instructions file published in the GitHub repository saltyeg/cadkit-mcp (1 stars, last pushed 4mo ago), licensed MIT. It adds 530 tokens to every session, about $0.0021 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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cadkit-mcp: Instructions file for Claude Code