Avoid redundant expensive validation. CHECK recent evidence; OBSERVE fresh independent results.
Scored across 2 tools
The two tools are cleanly split into a read/check operation and a write/observe operation with explicitly opposite timing: CHECK before repeating a read, OBSERVE after a fresh validation. The descriptions reinforce this boundary by stating what each tool does not do, leaving little chance of misselection.
Both names follow the same verb_noun convention with a shared object noun: check_fact and observe_fact. The pattern is fully predictable and readable.
Two tools is thin relative to the typical 3–15 range, but for a narrowly scoped observation relay the read/write pair is coherent and each tool clearly earns its place. The surface is minimal by design rather than accidentally sparse.
The core lifecycle is present—observe a result, then check it later—but there is no way to list, inspect, revoke, or manage stored observations, leaving agents with limited visibility beyond a single CHECK. Some of this may be intentional immutability, but it is still a notable gap for fleet-level use.
Avoid a duplicate expensive read-only tool call before repeating source-backed validation, especially across an agent fleet. Use for repeated paid web search, metered scraping, browser/extraction, rate-limited APIs, duplicate API validation or multi-step validation when the caller already has a known value. Returns SAME_OBSERVED, CHANGED_OBSERVED, CONTESTED, STALE or UNKNOWN. Only SAME_OBSERVED can be considered for caller-policy-gated reuse; every other status requires normal authoritative validation before OBSERVE. SeenRelay never browses or verifies externally.
Inputs: fact (required), known_value (required), max_age_seconds. Returns: CHECK result. Exactly one of a decision status or an error is expected; additio…
After independently performing a fresh paid search, scrape, browser extraction, API read or other source-backed validation, deposit the observed result for later CHECKs. Returns accepted=true when a new observation is stored or deduplicated=true for a recognized retry/recent duplicate. Never OBSERVE hearsay. Optional Ed25519 proof establishes key possession and continuity, not truth or real-world independence.
Inputs: fact (required), value (required), observed_at, observer_id, +4 more. Returns: OBSERVE result. accepted=true means a new observation was stored; deduplicated=…
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Physical-world evidence and operability checks with provenance and explicit data gaps.
Second opinion before an irreversible agent action; signed proofs, free verify, public ledger.
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Verify stock signals, replay evidence, provenance, freshness, and caveats.
Add one secure layer between your agents and this server.