canvas-drop
Turn web artifacts into tools your team can use. Publish from files or an AI agent, control access, and keep improving the same URL. Self-hosted and open source, with version history, backend primitives and MCP.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
How we verified
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⚡ Connect GitHub → continuous verification on every pushwhy connect →Who stands behind it
markpasternak
Source: github_repo_search
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
Nodemailer: Quadratic (O(n²)) time complexity in addressparser allows remote denial of service via a crafted address list
sharp: Vulnerabilities in libheif: GHSA-g89c-p67h-r497 and GHSA-2jg2-4ch7-h545
Hono: Query parser reads parameters after the URL fragment, causing cache-key and proxy interpretation differentials
Hono: Unbounded dot-notation nesting in `parseBody()` can cause memory exhaustion
Hono: Incomplete fix for CVE-2026-39408: `toSSG()` still writes files outside the output directory
CANVAS_DROP_DBDependencies
29 runtime dependencies (9 dev), 1 flagged: playwright
Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
49/49 tools missing one or more hints — whoami (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_canvas_connections (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_canvases (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +46 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Production dependencies are patched
0 critical, 2 high severity in production deps — nodemailer@9.0.3 (high), sharp@0.35.3 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Domain consistency
npm scope @canvas-drop doesn't match GitHub owner markpasternak
Use the same org name across GitHub, npm, and your homepage so users can verify the publisher.
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