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cadlens-mcp MCP server · D · ToolBench

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cadlens-mcp

github.com/cadlens-co/cadlens-mcp

Model Context Protocol server that wraps the CADLens REST API.

2026-07-28+STDIO7 tools

58/100

Definition Quality69

Protocol Readiness50

Supportability44

Spec posture

Inferred effective spec 2026-07-28+·current baseline 2026-07-28

Static source inference · medium confidence

Current-spec patterns detected

Summary

CADLens MCP has well-structured tool definitions with complete input schemas and descriptions for most tools. Naming follows verb_noun convention (parse_file, get_job, list_jobs, delete_job). However, 1 of 7 tools (cadlens_refresh_image_url) lacks a visible description entirely, and parameter descriptions are sparse or missing in several tools. Output schemas are not documented, LLMs cannot predict response structure. Error handling is basic (CadlensApiError caught but no recovery guidance). Tool composition is sound: parse tools feed into get_result, which supports multiple modes. Descriptions average ~120 chars, below the 194-char baseline for A+ tools.

Tools (7)

cadlens_delete_jobdestructiveauthsource verified78/100

Delete a job and its uploaded file and preview image from CADLens storage. Irreversible.

cadlens_get_jobread onlyauthsource verified77/100

Check the status of a CAD parse job. Returns PENDING, PROCESSING, COMPLETED, or FAILED.

cadlens_get_resultread onlyauthsource verified80/100

Fetch the parsed result of a completed CAD job. Use mode='summary' (default) for an overview, 'entities_by_type' or 'entities_on_layer' for filtered detail, or 'full' for the complete vector JSON (can be very large — only use when explicitly needed).

cadlens_list_jobsread onlyauthsource verified72/100

List the 100 most recent CAD parse jobs for the configured API key, newest first.

cadlens_parse_filewriteauthsource verified77/100

Parse a local CAD file (DWG/DXF/DWF/DWFx/DGN-V7/PDF, max 100 MB). Polls until the job completes or 5 minutes elapse. Returns a summary including the preview image URL. Use cadlens_get_result with the returned job_id to fetch detailed entity data.

cadlens_parse_urlwriteauthsource verified

Issues (5)

CRITICALtool-description ↗

cadlens_refresh_image_url has no visible description or input schema in source code. Tool is inferred from smoke test only.

cadlens_refresh_image_url

HIGHresponse-shaper ↗

No output schemas documented for any tool. LLMs cannot predict response structure (fields, types, pagination). Agents must guess what cadlens_parse_file returns or what cadlens_list_jobs pagination looks like.

cadlens_parse_filecadlens_parse_urlcadlens_get_jobcadlens_get_resultcadlens_list_jobscadlens_delete_job

HIGHtool-description ↗

Parameter descriptions missing or minimal. webhook_url and notify_email in parse_file/parse_url lack descriptions. entity_type and layer_name in get_result have minimal guidance on when to use them.

cadlens_parse_filecadlens_parse_urlcadlens_get_result

HIGH

Recommendations

Add a complete description and input schema for cadlens_refresh_image_url. Currently invisible in source; inferred from smoke test only.
Document output schemas for all tools. E.g., cadlens_parse_file returns {job_id, status, preview_url, summary}; cadlens_list_jobs returns {jobs: [{job_id, status, created_at}], total_count}.
Add descriptions to all parameters. webhook_url: 'Optional external webhook URL for job state-change notifications (independent of auto-registered local receiver).' notify_email: 'Optional email address to notify when parse completes unattended.'
Enhance error messages with recovery guidance. E.g., 'API key invalid. Check CADLENS_API_KEY environment variable.' or 'Job not found. Call cadlens_list_jobs to see available jobs.'
Add a dry-run mode to cadlens_delete_job or require explicit confirmation. E.g., add confirm: boolean parameter with description 'Must be true to irreversibly delete the job and its files.'

Score history

Overall score trend

First recorded score · v2 rubric

58/100

Scored	Grade	Overall	Spec posture	Rubric
2026-09-23	D	58	2026-07-28+	v2