kernelcad
warningsmcp.kernelcad.com
Agent-first CAD: editable .kcad.ts source, deterministic review, OpenCASCADE kernel.
https://mcp.kernelcad.com/mcpOAuthMCP 2025-11-25v1.0.0last checked 9 Oct 2026spoke MCP on 97.8% of 90 checks (30 days)initialize in 153 msWill my client connect?
Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.
✓Claude CodeConnects
The authorization server advertises RFC 7591 registration, so Claude Code can register itself and sign you in through the browser.
claude mcp add --transport http kernelcad https://mcp.kernelcad.com/mcpClaude Code docs · read on 2026-08-30
✓Claude (claude.ai & Desktop)Connects
The authorization server advertises RFC 7591 registration, so Claude (claude.ai & Desktop) can register itself and sign you in through the browser.
Settings → Connectors → Add custom connector, then paste https://mcp.kernelcad.com/mcp.
Claude (claude.ai & Desktop) docs · read on 2026-08-30
✓ChatGPTConnects
The authorization server advertises RFC 7591 registration, so ChatGPT can register itself and sign you in through the browser.
Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://mcp.kernelcad.com/mcp.
ChatGPT docs · read on 2026-08-30
✓CursorConnects
The authorization server advertises RFC 7591 registration, so Cursor can register itself and sign you in through the browser.
{
"mcpServers": {
"kernelcad": {
"url": "https://mcp.kernelcad.com/mcp"
}
}
}Cursor docs · read on 2026-08-30
✓VS Code (Copilot)Connects
The authorization server advertises RFC 7591 registration, so VS Code (Copilot) can register itself and sign you in through the browser.
{
"servers": {
"kernelcad": {
"type": "http",
"url": "https://mcp.kernelcad.com/mcp"
}
}
}VS Code (Copilot) docs · read on 2026-08-30
How to authenticate
Checked against the endpoint by our probe on 9 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.
| Scheme | OAuth |
|---|---|
| Issuer | https://mcp.kernelcad.com |
| Dynamic client registration | ✓Advertised (RFC 7591) |
| Client ID Metadata Document | ✕Not advertised |
| PKCE | ✓S256 |
| Grant types | implicit, authorization_code, refresh_token |
| Scopes | openid, offline_access |
| Protected-resource metadata | ✓Published (RFC 9728) |
| Anonymous access | Handshake succeeds; 56 tools listable |
| Credentials demanded in prose | ✕review_paint_peek_latest, get_project, get_project_revision, get_latest_render, get_model_mesh, send_to_printer These tools are listed anonymously and their own descriptions ask for an account or key, but no challenge is issued — so a client has nothing to act on and the refusal arrives as a tool error. |
What the probe found
6 of the 56 tools listed anonymously say in their own descriptions that they need an account or a key (review_paint_peek_latest, get_project, get_project_revision, get_latest_render, get_model_mesh, send_to_printer), but the endpoint issued no WWW-Authenticate challenge. The requirement is stated only in prose, so a call reaches the tool and comes back as a tool error instead of an authorization step.
A cross-origin preflight came back without Access-Control-Allow-Origin, so the endpoint is reachable from native clients only — code running in a web page is stopped by the browser before a request is ever sent.
The server exposes a public surface before authorization: review_paint_peek_latest, open_in_studio, get_project, get_project_revision, get_latest_render, get_model_mesh, request_upload, lookup_authoring_skill, mesh_summary, evaluate_script, diff_scripts, inspect, verify, why_did_this_fail, set_param, add_feature, add_surface, add_curve, add_path_segment, trace_from_image, add_variable_sweep, add_text, project_curve, add_pattern_feature, remove_feature, query, lookup_api, lookup_diagnostics, export, lookup_cookbook, find_part, fetch_part, solve_sketch, add_constraint, add_part, add_connector, add_mate, add_workspace_target, set_scene_return, solve_mates, review_cad, design_loop, flatten_pattern, evaluate_sdf, capture_animation, render_preview, resolve_assumptions, run_fea, fea_summary, send_to_printer, repair_script, sweep_tolerance, diff_geometry, drawing_to_cad, mesh_to_features, execute_cookbook.
Tools
Contract history
Instructions rewritten: evaluate_script, execute_cookbook, inspect, send_to_printer, trace_from_image. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: evaluate_script. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: open_in_studio. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: evaluate_script, open_in_studio. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: export, open_in_studio. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: drawing_to_cad, evaluate_script, inspect, mesh_to_features, open_in_studio, trace_from_image. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: fetch_part, find_part. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: export, open_in_studio. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: lookup_authoring_skill, review_cad. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: capture_animation, design_loop, evaluate_script, export, get_latest_render, get_project, inspect, open_in_studio, render_preview, send_to_printer, verify. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: design_loop, open_in_studio, verify. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: evaluate_script, open_in_studio. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: get_project, open_in_studio. The description an agent follows changed; the callable contract may not have.
Breaking: open_in_studio
Instructions rewritten: open_in_studio. The description an agent follows changed; the callable contract may not have.
Breaking: project_curve
Instructions rewritten: add_curve, add_path_segment, add_surface, add_variable_sweep, evaluate_script, export, inspect, lookup_api, project_curve, render_preview, verify. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: get_latest_render, mesh_summary, open_in_studio. The description an agent follows changed; the callable contract may not have.
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Status badge
Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.
[](https://mcpi.app/servers/kernelcad)