Synthex Forge — x402 Paid Agent Services

Verify Tool Output

verify_tool_output

Read-onlyIdempotent

Whether an output actually satisfies its schema, claims and staleness. use it rather than assess_tool_verdict for output, not verdict; an object with 57 fields including agedSeconds, algorithm. $0.5 USDC.

Input Schema

Name	Required	Description
`checks`	No	Which checks to run. Omit for the default set.
`output`	No	The output this operation operates on. See the schema for its type and whether it is required.
`schema`	No	The JSON Schema the operation operates on.
`claimed`	No	The claim being made.
`subject`	No	The subject the operation is applied to — an id, a URL or a name, depending on the operation.
`accuracy`	No	The accuracy this operation operates on. See the schema for its type and whether it is required.
`stalenessBudgetSeconds`	No	The stalenessBudgetSeconds this operation operates on. See the schema for its type and whether it is required.

Output Schema

Name	Required	Description
`key`	No	The `key` field of the response.
`max`	No	The `max` field of the response.
`min`	No	The `min` field of the response.
`axis`	No	The `axis` field of the response.
`kind`	No	The `kind` field of the response.
`mode`	No	The `mode` field of the response.
`note`	No	A note on how the answer was produced.
`path`	No	The `path` field of the response.
`tier`	No	The `tier` field of the response.
`total`	No	The `total` field of the response.
`clause`	No	The `clause` field of the response.
`counts`	No	The `counts` field of the response.
`detail`	Yes	Human-readable explanation of the verdict.
`perLeg`	No	The `perLeg` field of the response.
`sha256`	No	The `sha256` field of the response.
`usable`	No	The `usable` field of the response.
`finding`	No	The `finding` field of the response.
`framing`	No	The `framing` field of the response.
`matches`	No	The `matches` field of the response.
`metrics`	No	The `metrics` field of the response.
`scoping`	No	The `scoping` field of the response.
`skipped`	No	The `skipped` field of the response.
`subject`	No	The `subject` field of the response.
`verdict`	Yes	The decision this tool returned.
`findings`	No	The `findings` field of the response.
`severity`	No	The `severity` field of the response.
`signedBy`	No	The `signedBy` field of the response.
`algorithm`	No	The `algorithm` field of the response.
`checksRun`	No	The `checksRun` field of the response.
`fetchedAt`	No	The `fetchedAt` field of the response.
`stored_at`	No	The `stored_at` field of the response.
`assessable`	No	The `assessable` field of the response.
`ed25519Sig`	No	The `ed25519Sig` field of the response.
`mismatches`	No	The `mismatches` field of the response.
`overBudget`	No	The `overBudget` field of the response.
`verifiedAt`	No	The `verifiedAt` field of the response.
`agedSeconds`	No	The `agedSeconds` field of the response.
`series_rows`	No	The `series_rows` field of the response.
`coverageGaps`	No	The `coverageGaps` field of the response.
`evidenceCore`	No	The `evidenceCore` field of the response.
`observations`	No	The `observations` field of the response.
`outputSha256`	No	The `outputSha256` field of the response.
`paths_at_max`	No	The `paths_at_max` field of the response.
`paths_at_min`	No	The `paths_at_min` field of the response.
`publicKeyHex`	No	The `publicKeyHex` field of the response.
`verdictLevel`	No	The `verdictLevel` field of the response.
`coverage_gaps`	No	The `coverage_gaps` field of the response.
`hash_bound_ok`	No	The `hash_bound_ok` field of the response.
`attestation_id`	No	The `attestation_id` field of the response.
`evidenceDigest`	No	The `evidenceDigest` field of the response.
`reference_rows`	No	The `reference_rows` field of the response.
`canonicalSha256`	No	The `canonicalSha256` field of the response.
`hash_bound_fail`	No	The `hash_bound_fail` field of the response.
`reproducibility`	No	The `reproducibility` field of the response.
`standardVersion`	No	The `standardVersion` field of the response.
`verificationHint`	No	The `verificationHint` field of the response.
`stalenessBudgetSeconds`	No	The `stalenessBudgetSeconds` field of the response.

Schema Changelog

Changes observed during successful MCP inspections.

Changed59 schema fields changedOct 31, 2026

addedOutput schema / properties / agedSeconds

Added value: +{
+  "description": "The `agedSeconds` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / algorithm

Added value: +{
+  "description": "The `algorithm` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / assessable

Added value: +{
+  "description": "The `assessable` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / attestation_id

Added value: +{
+  "description": "The `attestation_id` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / axis

Added value: +{
+  "description": "The `axis` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / canonicalSha256

Added value: +{
+  "description": "The `canonicalSha256` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / checksRun

Added value: +{
+  "description": "The `checksRun` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / clause

Added value: +{
+  "description": "The `clause` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / counts

Added value: +{
+  "description": "The `counts` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / coverageGaps

Added value: +{
+  "description": "The `coverageGaps` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / coverage_gaps

Added value: +{
+  "description": "The `coverage_gaps` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / detail

Added value: +{
+  "description": "Human-readable explanation of the verdict.",
+  "type": "string"
+}

addedOutput schema / properties / ed25519Sig

Added value: +{
+  "description": "The `ed25519Sig` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / evidenceCore

Added value: +{
+  "description": "The `evidenceCore` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / evidenceDigest

Added value: +{
+  "description": "The `evidenceDigest` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / fetchedAt

Added value: +{
+  "description": "The `fetchedAt` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / finding

Added value: +{
+  "description": "The `finding` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / findings

Added value: +{
+  "description": "The `findings` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / framing

Added value: +{
+  "description": "The `framing` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / hash_bound_fail

Added value: +{
+  "description": "The `hash_bound_fail` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / hash_bound_ok

Added value: +{
+  "description": "The `hash_bound_ok` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / key

Added value: +{
+  "description": "The `key` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / kind

Added value: +{
+  "description": "The `kind` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / matches

Added value: +{
+  "description": "The `matches` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / max

Added value: +{
+  "description": "The `max` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / metrics

Added value: +{
+  "description": "The `metrics` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / min

Added value: +{
+  "description": "The `min` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / mismatches

Added value: +{
+  "description": "The `mismatches` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / mode

Added value: +{
+  "description": "The `mode` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / note

Added value: +{
+  "description": "A note on how the answer was produced.",
+  "type": "string"
+}

addedOutput schema / properties / observations

Added value: +{
+  "description": "The `observations` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / outputSha256

Added value: +{
+  "description": "The `outputSha256` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / overBudget

Added value: +{
+  "description": "The `overBudget` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / path

Added value: +{
+  "description": "The `path` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / paths_at_max

Added value: +{
+  "description": "The `paths_at_max` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / paths_at_min

Added value: +{
+  "description": "The `paths_at_min` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / perLeg

Added value: +{
+  "description": "The `perLeg` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / publicKeyHex

Added value: +{
+  "description": "The `publicKeyHex` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / reference_rows

Added value: +{
+  "description": "The `reference_rows` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / reproducibility

Added value: +{
+  "description": "The `reproducibility` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / scoping

Added value: +{
+  "description": "The `scoping` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / series_rows

Added value: +{
+  "description": "The `series_rows` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / severity

Added value: +{
+  "description": "The `severity` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / sha256

Added value: +{
+  "description": "The `sha256` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / signedBy

Added value: +{
+  "description": "The `signedBy` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / skipped

Added value: +{
+  "description": "The `skipped` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / stalenessBudgetSeconds

Added value: +{
+  "description": "The `stalenessBudgetSeconds` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / standardVersion

Added value: +{
+  "description": "The `standardVersion` field of the response.",
+  "type": "object"
+}

removedOutput schema / properties / status

Removed value: -{
-  "type": "string"
-}

addedOutput schema / properties / stored_at

Added value: +{
+  "description": "The `stored_at` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / subject

Added value: +{
+  "description": "The `subject` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / tier

Added value: +{
+  "description": "The `tier` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / total

Added value: +{
+  "description": "The `total` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / usable

Added value: +{
+  "description": "The `usable` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / verdict

Added value: +{
+  "description": "The decision this tool returned.",
+  "type": "string"
+}

addedOutput schema / properties / verdictLevel

Added value: +{
+  "description": "The `verdictLevel` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / verificationHint

Added value: +{
+  "description": "The `verificationHint` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / verifiedAt

Added value: +{
+  "description": "The `verifiedAt` field of the response.",
+  "type": "object"
+}

addedOutput schema / required

Added value: +[
+  "detail",
+  "verdict"
+]

AddedOct 31, 2026

TDQS

A3.9/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The annotations already establish that this is a read-only, idempotent, non-destructive, closed-world operation. The description adds useful behavioral context: it verifies schema conformance, claims, and staleness, mentions payment cost, and notes the return object is large with fields such as `agedSeconds` and `algorithm`.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loads the core purpose and differentiation. However, the grammar is awkward in places ('use it rather than...'), and the note about the 57-field return object is arguably redundant because an output schema already exists.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given rich structured metadata, including full schema coverage, annotations, and an output schema, the description is largely complete for selecting and invoking the tool. It could be stronger with a clearer enumeration of checks or subject/accuracy behavior, but the essentials are present.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all seven parameters. The description gestures at schema, claims, and staleness, but does not add meaningful semantics for parameters such as `checks`, `subject`, or `accuracy` beyond what the schema provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description identifies a specific verification operation for output and explicitly contrasts it with `assess_tool_verdict` by saying 'for output, not verdict.' The meaning is clear, though the opening is an incomplete fragment ('Whether an output...') rather than a direct verb phrase.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives a direct routing rule: use this rather than `assess_tool_verdict` when dealing with output rather than a verdict. That is a clear alternative and exclusion, but it does not cover other potentially adjacent verification tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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