You already know X
Keep the value your application previously obtained from the authoritative source.
KNOWN-STATE REVALIDATION
Describe the same public fact the same way.
SeenRelay CHECK is useful when your application already knows a value and needs to decide whether another authoritative validation is worth doing now. These canonical descriptors reduce accidental fragmentation for a small set of public source-backed facts that SeenRelay already supports with bounded first-party observations.
BOUNDARY
This is identity metadata, not a cache of answers.
The catalog publishes no observed values, no recommended TTL and no reuse authorization. Your caller supplies the known value and its own freshness policy. SeenRelay can then report compatible recent evidence; the authoritative source remains the fallback.
CHECK recent evidence
Use the canonical source, predicate and locator plus your explicit max-age policy.
Validate when needed
Unknown, stale, contested or policy-rejected evidence falls through to the source. Fresh independent validation may OBSERVE afterward.
STARTER CATALOG
15 canonical public facts.
These facts are intentionally narrow. The public protocol remains generic CHECK + OBSERVE; this catalog only gives independent integrations a common deterministic description for these source-backed coordinates.
GitHub overall status indicator
github-status-indicator
Predicate: status.indicator
Locator: /status/indicator
GitHub overall status description
github-status-description
Predicate: status.description
Locator: /status/description
Latest Node.js release version
node-latest-version
Predicate: version.latest
Locator: /0/version
Latest openai Python package version
pypi-openai-version
Predicate: version.latest
Locator: /info/version
Latest anthropic Python package version
pypi-anthropic-version
Predicate: version.latest
Locator: /info/version
Latest mcp Python package version
pypi-mcp-version
Predicate: version.latest
Locator: /info/version
Latest langchain Python package version
pypi-langchain-version
Predicate: version.latest
Locator: /info/version
Latest llama-index Python package version
pypi-llama-index-version
Predicate: version.latest
Locator: /info/version
Latest crewai Python package version
pypi-crewai-version
Predicate: version.latest
Locator: /info/version
Latest browser-use Python package version
pypi-browser-use-version
Predicate: version.latest
Locator: /info/version
Latest openai npm package version
npm-openai-version
Predicate: version.latest
Locator: /version
Latest Anthropic npm SDK version
npm-anthropic-sdk-version
Predicate: version.latest
Locator: /version
Latest Model Context Protocol npm SDK version
npm-mcp-sdk-version
Predicate: version.latest
Locator: /version
Latest Vercel AI SDK npm version
npm-vercel-ai-version
Predicate: version.latest
Locator: /version
Latest Google GenAI npm version
npm-google-genai-version
Predicate: version.latest
Locator: /version
DO NOT GUESS
Need another shared fact?
Use the Fact Coordinate Kit only when a stable authoritative source and source-native locator exist. Prefer fragmentation to false convergence.