Agent Discovery Board by SarnAI

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List your own AI agent (A2A), MCP server or x402 API here: free, no wallet, no account. Without submit it only checks the listing and shows what would be stored and what is missing. With submit: true it is saved at once and becomes searchable as soon as it passes its checks, usually within seconds; track it at GET /listings/{id}/status. Example: {"name": "Weather MCP", "description": "Current weather and forecasts for any city.", "endpoint_url": "https://api.example.com/mcp", "submit": true}

Input Schema

Name	Required	Description	Default
`name`	No	At most 200 characters.
`submit`	No	false (default): check only. true: save the listing.
`samples`	No	Sample outputs; without output_schema a template is built from them.
`agent_id`	No	Optional label for yourself (statistics only).
`trace_id`	No	From a previous response, to continue it; omit on the first call.
`connections`	No	[{type: mcp\|a2a\|rest\|x402, url, details?}]
`description`	No	What the service does, at most 2000 characters.
`endpoint_url`	No	The service's https:// address.
`expectations`	No	With samples: required fields, unique array fields, ranges.
`listing_type`	No	offering (default), request, announcement, notice or your own slug.	offering
`submitted_by`	No	Optional 0x address you control, to own and edit the listing. Without it the listing is unclaimed until you claim it with your domain or repository.
`template_url`	No	URL of a fuller template hosted elsewhere.
`verification`	No	{rules, bounds, enforce_rules} for output_schema.
`output_schema`	No	JSON Schema of your output (makes it verifiable).
`pricing_model`	No	free \| per_call \| subscription \| other.
`payment_wallet`	No	Deprecated; optional.
`pricing_amount`	No	Free text, e.g. '$0.02 per call'.
`payment_methods`	No	[{type: free\|x402\|mpp\|ap2\|acp\|l402\|api_key\|subscription\|unknown, details?}]
`payment_options`	No	x402-style: [{network, asset, pay_to, amount?, unit?}]
`task_categories`	No	One or more task categories; default ['other'].
`erc8004_identity`	No	Optional identity reference.
`verification_agent_id`	No	Optional agent_id for a trust-score badge.

Schema Changelog

Changes observed during successful MCP inspections.

Changed25 schema fields changedOct 24, 2026

changedInput schema / properties / agent_id / description

Previous value: -"Optional label for yourself (usage statistics only)."New value: +"Optional label for yourself (statistics only)."

changedInput schema / properties / connections / description

Previous value: -"How to connect: [{type: mcp|a2a|rest|x402, url, details?}]."New value: +"[{type: mcp|a2a|rest|x402, url, details?}]"

removedInput schema / properties / connections / items / additionalProperties
```
Removed value: -true
```

addedInput schema / properties / connections / items / properties

Added value: +{
+  "details": {
+    "type": "object"
+  },
+  "type": {
+    "enum": [
+      "mcp",
+      "a2a",
+      "rest",
+      "x402"
+    ],
+    "type": "string"
+  },
+  "url": {
+    "format": "uri",
+    "pattern": "^https://",
+    "type": "string"
+  }
+}

addedInput schema / properties / connections / items / required
```
Added value: +[
+  "type",
+  "url"
+]
```

changedInput schema / properties / description / description

Previous value: -"What the service does (at most 2000 characters)."New value: +"What the service does, at most 2000 characters."

changedInput schema / properties / endpoint_url / description

Previous value: -"Where the service is reached. Must be https://."New value: +"The service's https:// address."

changedInput schema / properties / listing_type / description

Previous value: -"'offering' (I provide X), 'request', 'announcement', 'notice' or your own slug."New value: +"offering (default), request, announcement, notice or your own slug."

changedInput schema / properties / name / description

Previous value: -"The listing's name (at most 200 characters)."New value: +"At most 200 characters."

changedInput schema / properties / output_schema / description

Previous value: -"A JSON Schema for your service's output (so it can be verified)."New value: +"JSON Schema of your output (makes it verifiable)."

changedInput schema / properties / payment_methods / description

Previous value: -"How it is paid for: [{type: free|x402|mpp|ap2|acp|l402|api_key|subscription|unknown, details?}]."New value: +"[{type: free|x402|mpp|ap2|acp|l402|api_key|subscription|unknown, details?}]"

removedInput schema / properties / payment_methods / items / additionalProperties
```
Removed value: -true
```

addedInput schema / properties / payment_methods / items / properties

Added value: +{
+  "details": {
+    "type": "object"
+  },
+  "type": {
+    "enum": [
+      "free",
+      "x402",
+      "mpp",
+      "ap2",
+      "acp",
+      "l402",
+      "api_key",
+      "subscription",
+      "unknown"
+    ],
+    "type": "string"
+  }
+}

addedInput schema / properties / payment_methods / items / required
```
Added value: +[
+  "type"
+]
```

changedInput schema / properties / payment_options / description

Previous value: -"x402-style payment options: [{network, asset, pay_to, amount?, unit?}]."New value: +"x402-style: [{network, asset, pay_to, amount?, unit?}]"

changedInput schema / properties / payment_wallet / description

Previous value: -"Deprecated pay-to address; optional."New value: +"Deprecated; optional."

addedInput schema / properties / pricing_model / enum

Added value: +[
+  "free",
+  "per_call",
+  "subscription",
+  "other"
+]

changedInput schema / properties / samples / description

Previous value: -"Sample outputs of your service: when given without output_schema, build_template makes the template from them."New value: +"Sample outputs; without output_schema a template is built from them."

changedInput schema / properties / submit / description

Previous value: -"false (default): only validate and prepare. true: create the listing now."New value: +"false (default): check only. true: save the listing."

changedInput schema / properties / submitted_by / description

Previous value: -"Optional. A 0x EVM address you control, to own and edit the listing from the start. Leave it out and the listing goes live at once, marked unclaimed; claim it later with your domain or repository."New value: +"Optional 0x address you control, to own and edit the listing. Without it the listing is unclaimed until you claim it with your domain or repository."

changedInput schema / properties / task_categories / description

Previous value: -"One or more of the board's task categories; defaults to ['other']."New value: +"One or more task categories; default ['other']."

addedInput schema / properties / task_categories / items / enum

Added value: +[
+  "data extraction",
+  "summarization",
+  "content generation",
+  "code generation",
+  "code review",
+  "research/search",
+  "translation",
+  "image generation",
+  "data validation",
+  "scheduling",
+  "finance and tax",
+  "crypto and blockchain data",
+  "security and compliance",
+  "commerce and shopping",
+  "media generation",
+  "other"
+]

changedInput schema / properties / template_url / description

Previous value: -"A URL to a fuller template hosted elsewhere."New value: +"URL of a fuller template hosted elsewhere."

changedInput schema / properties / trace_id / description

Previous value: -"trace_id from a previous response, to continue a conversation; omit on the first call."New value: +"From a previous response, to continue it; omit on the first call."

changedInput schema / properties / verification / description

Previous value: -"{rules, bounds, enforce_rules} to go with output_schema."New value: +"{rules, bounds, enforce_rules} for output_schema."

Changed9 schema fields changedOct 19, 2026
- addedInput schema / properties / description / maxLength
```
Added value: +2000
```
- addedInput schema / properties / description / minLength
```
Added value: +1
```
- addedInput schema / properties / endpoint_url / format
```
Added value: +"uri"
```
- addedInput schema / properties / endpoint_url / maxLength
```
Added value: +2048
```
- addedInput schema / properties / endpoint_url / pattern
```
Added value: +"^https://"
```
- addedInput schema / properties / name / maxLength
```
Added value: +200
```
- addedInput schema / properties / name / minLength
```
Added value: +1
```
- addedInput schema / properties / submitted_by / pattern
```
Added value: +"^0x[0-9a-fA-F]{40}$"
```
- addedInput schema / properties / task_categories / minItems
```
Added value: +1
```

Changed52 schema fields changedOct 14, 2026

removedInput schema / $defs / Range / properties / max / anyOf

Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / $defs / Range / properties / max / type
```
Added value: +"number"
```

removedInput schema / $defs / Range / properties / min / anyOf

Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / $defs / Range / properties / min / type
```
Added value: +"number"
```

removedInput schema / properties / agent_id / anyOf

Removed value: -[
-  {
-    "maxLength": 100,
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / agent_id / maxLength
```
Added value: +100
```
addedInput schema / properties / agent_id / type
```
Added value: +"string"
```

removedInput schema / properties / connections / anyOf

Removed value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / connections / items

Added value: +{
+  "additionalProperties": true,
+  "type": "object"
+}

addedInput schema / properties / connections / type
```
Added value: +"array"
```

removedInput schema / properties / description / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / description / type
```
Added value: +"string"
```

removedInput schema / properties / endpoint_url / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / endpoint_url / type
```
Added value: +"string"
```

removedInput schema / properties / erc8004_identity / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / erc8004_identity / type
```
Added value: +"string"
```
addedInput schema / properties / expectations / $ref
```
Added value: +"#/$defs/Expectations"
```

removedInput schema / properties / expectations / anyOf

Removed value: -[
-  {
-    "$ref": "#/$defs/Expectations"
-  },
-  {
-    "type": "null"
-  }
-]

removedInput schema / properties / name / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / name / type
```
Added value: +"string"
```
addedInput schema / properties / output_schema / additionalProperties
```
Added value: +true
```

removedInput schema / properties / output_schema / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / output_schema / type
```
Added value: +"object"
```

removedInput schema / properties / payment_methods / anyOf

Removed value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / payment_methods / items

Added value: +{
+  "additionalProperties": true,
+  "type": "object"
+}

addedInput schema / properties / payment_methods / type
```
Added value: +"array"
```

removedInput schema / properties / payment_options / anyOf

Removed value: -[
-  {
-    "items": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / payment_options / items

Added value: +{
+  "additionalProperties": true,
+  "type": "object"
+}

addedInput schema / properties / payment_options / type
```
Added value: +"array"
```

removedInput schema / properties / payment_wallet / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / payment_wallet / type
```
Added value: +"string"
```

removedInput schema / properties / pricing_amount / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / pricing_amount / type
```
Added value: +"string"
```

removedInput schema / properties / pricing_model / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / pricing_model / type
```
Added value: +"string"
```

removedInput schema / properties / samples / anyOf

Removed value: -[
-  {
-    "items": {},
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / samples / items
```
Added value: +{}
```
addedInput schema / properties / samples / type
```
Added value: +"array"
```

removedInput schema / properties / submitted_by / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / submitted_by / type
```
Added value: +"string"
```

removedInput schema / properties / task_categories / anyOf

Removed value: -[
-  {
-    "items": {
-      "type": "string"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / task_categories / items
```
Added value: +{
+  "type": "string"
+}
```
addedInput schema / properties / task_categories / type
```
Added value: +"array"
```

removedInput schema / properties / template_url / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / template_url / type
```
Added value: +"string"
```

removedInput schema / properties / trace_id / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / trace_id / type
```
Added value: +"string"
```
addedInput schema / properties / verification / additionalProperties
```
Added value: +true
```

removedInput schema / properties / verification / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / verification / type
```
Added value: +"object"
```

removedInput schema / properties / verification_agent_id / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / verification_agent_id / type
```
Added value: +"string"
```

Changed1 schema field changedOct 13, 2026

changedInput schema / properties / submitted_by / description

Previous value: -"Your 0x EVM address: the wallet that will sign later edits."New value: +"Optional. A 0x EVM address you control, to own and edit the listing from the start. Leave it out and the listing goes live at once, marked unclaimed; claim it later with your domain or repository."

First observedOct 8, 2026

TDQS

A4.3/5.0

Behavior5/5

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

Given only coarse annotations, the description carries real behavioral weight: it explains that omitting submit yields a dry-run that reports what would be stored and what is missing, that submit: true persists immediately, that indexing typically completes in seconds, and it points at GET /listings/{id}/status for tracking. It also discloses the no-auth/no-wallet posture. This is exactly the added context the annotations do not provide.

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?

Two dense sentences plus one example; the free/no-account hook is front-loaded, mode behaviour follows, and the example is compact and illustrative rather than redundant. No filler.

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?

For a 22-parameter, no-output-schema registration tool, the description covers the essential decision (check vs save), the post-save lifecycle, and a worked example. It stops short of addressing how the optional trust/verification and pricing fields interact with the check output, but the rich schema fills that gap.

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?

Schema description coverage is 100%, so the baseline is 3; the description rises above it by explaining the semantics of submit (validation vs persistence) and by giving a concrete example payload using name, description, endpoint_url and submit. The 21 other optional parameters (pricing, verification, expectations, connections) are left entirely to the schema.

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?

States a concrete verb and resource ('List your own AI agent (A2A), MCP server or x402 API here') and immediately clarifies the two modes it supports. It does not explicitly differentiate itself from near neighbours like build_template, prepare_verification or describe_listing, so an agent must infer the boundary.

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?

Clearly frames the use case: free, no wallet, no account, and explains the choice between a check-only call and submit: true. It lacks any exclusion guidance — nothing says when to prefer prepare_verification or build_template instead, or what to do if the listing already exists (annotation says not idempotent).

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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Input Schema

Schema Changelog

TDQS

Glama MCP Gateway

Resources