Council of AI GSPC

x402 catalog trust snapshot

x402_trust

Read-onlyIdempotent

GET the latest x402 catalog trust snapshot: counts of how many catalogued x402 resources open a correct 402 challenge vs how many are phantom on the wire. Counts only by doctrine — host details withheld; a 402 is NOT delivery; measurement, never certification.

Input Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Output Schema

TableJSON Schema

Name	Required	Description
`kind`	No
`as_of`	No
`state`	Yes	VALID or UNREACHABLE
`counts`	No
`source`	No
`headline`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedSep 26, 2026

changedOutput schema / properties / as_of / type

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

changedOutput schema / properties / counts / type

Previous value: -"object"New value: +[
+  "object",
+  "null"
+]

changedOutput schema / properties / headline / type

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

addedOutput schema / properties / kind
```
Added value: +{}
```
addedOutput schema / properties / source
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / state

Added value: +{
+  "description": "VALID or UNREACHABLE",
+  "type": "string"
+}

addedOutput schema / required
```
Added value: +[
+  "state"
+]
```

Changed7 schema fields changedSep 26, 2026

changedOutput schema / properties / as_of / type

Previous value: -[
-  "string",
-  "null"
-]New value: +"string"

changedOutput schema / properties / counts / type

Previous value: -[
-  "object",
-  "null"
-]New value: +"object"

changedOutput schema / properties / headline / type

Previous value: -[
-  "string",
-  "null"
-]New value: +"string"

removedOutput schema / properties / kind
```
Removed value: -{}
```

removedOutput schema / properties / source

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

removedOutput schema / properties / state

Removed value: -{
-  "description": "VALID or UNREACHABLE",
-  "type": "string"
-}

removedOutput schema / required
```
Removed value: -[
-  "state"
-]
```

Changed7 schema fields changedSep 26, 2026

changedOutput schema / properties / as_of / type

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

changedOutput schema / properties / counts / type

Previous value: -"object"New value: +[
+  "object",
+  "null"
+]

changedOutput schema / properties / headline / type

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

addedOutput schema / properties / kind
```
Added value: +{}
```
addedOutput schema / properties / source
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / state

Added value: +{
+  "description": "VALID or UNREACHABLE",
+  "type": "string"
+}

addedOutput schema / required
```
Added value: +[
+  "state"
+]
```

First observedSep 26, 2026

TDQS

A4.5/5.0

Behavior5/5

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

The description adds meaningful behavioral context beyond the annotations: host details are withheld, counts are doctrine-only, and a 402 is explicitly not delivery. These caveats clarify both scope and limitations in a way the schema and annotations alone would not convey.

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

Conciseness5/5

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

The entire definition is a single dense sentence that front-loads the operation and resource, then packs essential caveats into semicolon-separated clauses. Every phrase earns its place; there is no redundant wording.

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

Completeness5/5

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

For a zero-parameter read-only snapshot with an output schema, the description is fully adequate. The annotations cover safety and idempotence, and the description covers semantic limitations. Nothing needed to call this tool correctly is missing.

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

Parameters4/5

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

The tool has zero parameters and 100% schema coverage, so the description has no parameter burden. The baseline of 4 applies; the description appropriately makes clear this is a no-input snapshot call.

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

Purpose5/5

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

The description clearly identifies a specific verb ('GET'), a specific resource ('x402 catalog trust snapshot'), and the exact data being returned (counts of correct 402 challenges vs phantom resources). It is distinct from sibling tools like mcp_trust by focusing on x402 catalog counts, not general trust or individual records.

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

Usage Guidelines3/5

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

The description implies when to use this tool: when you need aggregate x402 catalog trust counts by doctrine. It also warns 'measurement, never certification,' suggesting it should not be used for certification decisions. However, it does not explicitly name alternatives or state exclusion conditions, leaving some inference required.

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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