Developer Tools · Productivity
Thing Description
Check
Validate a hosted or pasted W3C WoT Thing Description against both the JSON Schema and the beyond-schema assertions ajv alone cannot check, in chat
Thing Description Check runs the same live engine here and in your assistant
Live playground
Use Thing Description Check now
Point a tool at a public W3C WoT Thing Description — a raw URL or a device's /.well-known/wot-td — and get the schema verdict plus the beyond-schema assertions a plain JSON-Schema run misses.
Your usage
—
Free forever — create a free account for a bigger monthly allowance that follows you across every app and every assistant.Pooled across every app and surface. Manage usage
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Marketplaces
Open Thing Description Check where you already work — every listing runs the same live engine as this page.
- Marketplace listings are on the way. Meanwhile, point any MCP-compatible assistant straight at the live endpoint:
https://powmcp.com/thing-description-check/mcp
Proof
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- Thing Description Check
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Engine Anatomy
Proof
Thing Description Check
What it does
Validate a hosted or pasted W3C WoT Thing Description against both the JSON Schema and the beyond-schema assertions ajv alone cannot check, in chat
Validate one W3C Web of Things Thing Description 1.1 (the JSON-LD a device or service exposes, at a URL or pasted raw) against the shipped JSON Schema AND the normative additional assertions — resolved security-scheme references, raw duplicate-key detection, and data-schema sanity — reporting the schema and additional dimensions separately, or compare two same-lineage TDs to see what regressed or resolved, with a clear conforms-versus-device-actually-works boundary.
Tools in this application
Td Check
td_check
td_check
Td Compare
td_compare
td_compare
0USD
Free to use with fair-use rate limits.
Thing Description Check questions
Scope and boundaries for Thing Description Check.
01What does Thing Description Check actually check?
Validate one W3C Web of Things Thing Description 1.1 (the JSON-LD a device or service exposes, at a URL or pasted raw) against the shipped JSON Schema AND the normative additional assertions — resolved security-scheme references, raw duplicate-key detection, and data-schema sanity — reporting the schema and additional dimensions separately, or compare two same-lineage TDs to see what regressed or resolved, with a clear conforms-versus-device-actually-works boundary.
02What does it never do?
It reports what its pinned engine measured and nothing more — it does not judge quality, correctness of your underlying business decisions, or anything outside its stated scope, and it never fabricates a result.
03What does it cost?
Nothing. Every published app is free to use with fair-use rate limits.
04Can my assistant connect directly?
Yes — any MCP-compatible assistant can connect straight to the canonical endpoint: https://powmcp.com/thing-description-check/mcp. Marketplace listings are conveniences over the same live engine.