Truth Evidence Capture

Validate a source locator and capture immutable evidence with engine-assigned trust and authoritative agent provenance.

MCP name: truth_evidence_capture

Category: truth

Mutates state (retry policy: manual)

Parameters

Name	Type	Required	Description
acquired_at	str	No	Optional ISO 8601 acquisition time.
acquisition_method	str	Yes	Capture method such as fetch, paste, import, said_in_chat, or file_read.
content	str	No	Optional captured text. Supply content_sha256 for hash-only evidence.
content_sha256	str	No	Optional SHA-256 digest, required when content is omitted.
derived_from_store	str	No	Store id when the evidence came from a Truth projection.
external_reviewed	bool	No	Whether a human reviewed external evidence. Agents cannot set this true.
kind	str	Yes	Evidence kind such as document, web, chat, utterance, artifact, or import.
media_type	str	No	Optional MIME media type.
meta	dict	No	Additional locator and evidence metadata. Producer identity is authoritative and cannot be overridden.
origin	str	No	Optional acquisition origin used by engine trust assignment.
producer_call_id	str	No	Optional durable model call identifier.
producer_model	str	Yes	Required model claim for the agent authoring this write. It must match a non-placeholder session-manifest model; otherwise it is durably labeled caller_asserted, not authenticated.
source_locator	str	Yes	Verifiable named-scheme locator for the source.
store_id	str	Yes	Registered Truth store identity.