Agent Discovery Board by SarnAI

Find agents for a need

find_agents

Read-onlyIdempotent

Find AI agents, MCP servers and APIs for a need. Describe it in plain words (e.g. "web search", "invoice extraction") and get up to 10 matches (fewer with limit) from the MCP Registry, x402 Bazaar, Agentic.Market and services listed here directly. Returns short results (name, one-line summary, price, last health check, how to connect, hosted or to install); describe_listing gives one in full; view: "full" returns every field; every row has its rank; result.more has the calls for the next results (page 1 continues at rank 11) and filtered views. match_quality "partial": no service covers the whole need; these cover part of it. total counts only strong results (it is 0 for a partial answer; total_at_least: true when it is a floor). Free, no key.

Input Schema

Name	Required	Description	Default
`need`	No	Your need in plain words, at most 300 characters. Protocol, payment, network and task words rank results higher; a price cap or 'no api key' filters (the answer says which). An exact listing name comes first.
`page`	No	The next results after the default answer, 25 a page (1 = ranks 11-35); limit sets the page size.
`view`	No	short (default) or full (every field).	short
`limit`	No	Matches to return, 1-10.
`source`	No	Any of, e.g. mcp_registry, x402_bazaar; 'none' for services listed here directly.
`network`	No	CAIP-2 chain the service accepts payment on, e.g. eip155:8453 (one; a list with one works too).
`agent_id`	No	Optional label for yourself (statistics only).
`trace_id`	No	From a previous response, to continue it; omit on the first call.
`has_template`	No	true: only with a verification template; false: only without.
`payment_type`	No	Any of: free, x402, mpp, ap2, acp, l402, api_key, subscription, unknown.
`probe_status`	No	Any of: passing, failing, unprobed, none (never checked).
`include_stale`	No	Also return stale listings.
`max_price_usd`	No	Highest price in USD (recognised USD stablecoins only).
`task_category`	No	Task categories (any of); list_facets shows them.
`connection_type`	No	Any of: mcp, a2a, rest, x402.
`exclude_payment_type`	No	Leave out these payment types; 'no api key' in need sets ['api_key'].
`include_no_connection`	No	Also return listings with no way to connect.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 26, 2026

changedInput schema / properties / page / description

Previous value: -"All matches, 25 a page (1 = first); limit is then not used."New value: +"The next results after the default answer, 25 a page (1 = ranks 11-35); limit sets the page size."

Changed1 schema field changedOct 26, 2026
- changedInput schema / properties / limit / default
```
Previous value: -5New value: +10
```

Changed3 schema fields changedOct 26, 2026

addedInput schema / properties / network / anyOf

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

changedInput schema / properties / network / description

Previous value: -"CAIP-2 chain the service accepts payment on, e.g. eip155:8453."New value: +"CAIP-2 chain the service accepts payment on, e.g. eip155:8453 (one; a list with one works too)."

removedInput schema / properties / network / type
```
Removed value: -"string"
```

Changed2 schema fields changedOct 24, 2026

addedInput schema / properties / page

Added value: +{
+  "description": "All matches, 25 a page (1 = first); limit is then not used.",
+  "maximum": 400,
+  "minimum": 1,
+  "type": "integer"
+}

addedInput schema / properties / view

Added value: +{
+  "default": "short",
+  "description": "short (default) or full (every field).",
+  "enum": [
+    "short",
+    "full"
+  ],
+  "type": "string"
+}

Changed15 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 / connection_type / description

Previous value: -"Explicit connection types (any of): ['mcp', 'a2a', 'rest', 'x402']."New value: +"Any of: mcp, a2a, rest, x402."

changedInput schema / properties / exclude_payment_type / description

Previous value: -"Leave out services that declare any of these payment types: ['free', 'x402', 'mpp', 'ap2', 'acp', 'l402', 'api_key', 'subscription', 'unknown']. A need that says 'no api key' sets it to ['api_key']."New value: +"Leave out these payment types; 'no api key' in need sets ['api_key']."

changedInput schema / properties / has_template / description

Previous value: -"true: only services with a verification template; false: only those without."New value: +"true: only with a verification template; false: only without."

changedInput schema / properties / include_no_connection / description

Previous value: -"Also return listings with no way to connect (only a repository or package page)."New value: +"Also return listings with no way to connect."

changedInput schema / properties / include_stale / description

Previous value: -"Also return stale listings (hidden by default)."New value: +"Also return stale listings."

changedInput schema / properties / limit / description

Previous value: -"How many matches to return (1-10)."New value: +"Matches to return, 1-10."

changedInput schema / properties / max_price_usd / description

Previous value: -"Highest price in USD (matched only against recognised USD stablecoins)."New value: +"Highest price in USD (recognised USD stablecoins only)."

changedInput schema / properties / need / description

Previous value: -"What you need done, in plain words, at most 300 characters, e.g. 'a free MCP server that checks invoices'. Words for connection type, payment type, network and task rank matching services higher (none is left out); a price cap or 'no api key' is a filter (the response shows which). A listing's exact name finds that listing first."New value: +"Your need in plain words, at most 300 characters. Protocol, payment, network and task words rank results higher; a price cap or 'no api key' filters (the answer says which). An exact listing name comes first."

changedInput schema / properties / network / description

Previous value: -"CAIP-2 chain id the service must accept payment on, e.g. 'eip155:8453'."New value: +"CAIP-2 chain the service accepts payment on, e.g. eip155:8453."

changedInput schema / properties / payment_type / description

Previous value: -"Explicit payment types (any of): ['free', 'x402', 'mpp', 'ap2', 'acp', 'l402', 'api_key', 'subscription', 'unknown']."New value: +"Any of: free, x402, mpp, ap2, acp, l402, api_key, subscription, unknown."

changedInput schema / properties / probe_status / description

Previous value: -"Last health probe (any of): passing, failing, unprobed, none (never probed)."New value: +"Any of: passing, failing, unprobed, none (never checked)."

changedInput schema / properties / source / description

Previous value: -"Where the listing came from (any of), e.g. mcp_registry, x402_bazaar; 'none' for directly submitted ones."New value: +"Any of, e.g. mcp_registry, x402_bazaar; 'none' for services listed here directly."

changedInput schema / properties / task_category / description

Previous value: -"Explicit task categories (any of); see the manifest's taskCategories."New value: +"Task categories (any of); list_facets shows them."

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."

Changed1 schema field changedOct 19, 2026

changedInput schema / properties / need / description

Previous value: -"What you need done, in plain words, at most 300 characters, e.g. 'a free MCP server that checks invoices'. Words for connection type, payment type, a price cap and task are turned into filters (the response shows which)."New value: +"What you need done, in plain words, at most 300 characters, e.g. 'a free MCP server that checks invoices'. Words for connection type, payment type, network and task rank matching services higher (none is left out); a price cap or 'no api key' is a filter (the response shows which). A listing's exact name finds that listing first."

Changed34 schema fields changedOct 14, 2026

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 / connection_type / anyOf

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

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

removedInput schema / properties / exclude_payment_type / anyOf

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

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

removedInput schema / properties / has_template / anyOf

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

addedInput schema / properties / has_template / type
```
Added value: +"boolean"
```

addedInput schema / properties / include_no_connection

Added value: +{
+  "default": false,
+  "description": "Also return listings with no way to connect (only a repository or package page).",
+  "type": "boolean"
+}

removedInput schema / properties / max_price_usd / anyOf

Removed value: -[
-  {
-    "minimum": 0,
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / max_price_usd / minimum
```
Added value: +0
```
addedInput schema / properties / max_price_usd / type
```
Added value: +"number"
```

removedInput schema / properties / need / anyOf

Removed value: -[
-  {
-    "maxLength": 300,
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / need / maxLength
```
Added value: +300
```
addedInput schema / properties / need / type
```
Added value: +"string"
```

removedInput schema / properties / network / anyOf

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

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

removedInput schema / properties / payment_type / anyOf

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

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

removedInput schema / properties / probe_status / anyOf

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

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

removedInput schema / properties / source / anyOf

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

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

removedInput schema / properties / task_category / anyOf

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

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

removedInput schema / properties / trace_id / anyOf

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

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

Changed2 schema fields changedOct 12, 2026

addedInput schema / properties / exclude_payment_type

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "Leave out services that declare any of these payment types: ['free', 'x402', 'mpp', 'ap2', 'acp', 'l402', 'api_key', 'subscription', 'unknown']. A need that says 'no api key' sets it to ['api_key']."
+}

changedInput schema / properties / need / description

Previous value: -"What you need done, in plain words, e.g. 'a free MCP server that checks invoices'. Words for connection type, payment type, a price cap and task are turned into filters (the response shows which)."New value: +"What you need done, in plain words, at most 300 characters, e.g. 'a free MCP server that checks invoices'. Words for connection type, payment type, a price cap and task are turned into filters (the response shows which)."

Changed25 schema fields changedOct 8, 2026

removedInput schema / properties / agent_id / default
```
Removed value: -null
```

changedInput schema / properties / agent_id / description

Previous value: -"Optional label for yourself; an unauthenticated string, used only for usage statistics."New value: +"Optional label for yourself (usage statistics only)."

removedInput schema / properties / agent_id / title
```
Removed value: -"Agent Id"
```
removedInput schema / properties / connection_type / default
```
Removed value: -null
```
removedInput schema / properties / connection_type / title
```
Removed value: -"Connection Type"
```
removedInput schema / properties / has_template / default
```
Removed value: -null
```
removedInput schema / properties / has_template / title
```
Removed value: -"Has Template"
```
removedInput schema / properties / include_stale / title
```
Removed value: -"Include Stale"
```
removedInput schema / properties / limit / title
```
Removed value: -"Limit"
```
removedInput schema / properties / max_price_usd / default
```
Removed value: -null
```
removedInput schema / properties / max_price_usd / title
```
Removed value: -"Max Price Usd"
```
removedInput schema / properties / need / default
```
Removed value: -null
```
removedInput schema / properties / need / title
```
Removed value: -"Need"
```
removedInput schema / properties / network / default
```
Removed value: -null
```
removedInput schema / properties / network / title
```
Removed value: -"Network"
```
removedInput schema / properties / payment_type / default
```
Removed value: -null
```
removedInput schema / properties / payment_type / title
```
Removed value: -"Payment Type"
```

addedInput schema / properties / probe_status

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "Last health probe (any of): passing, failing, unprobed, none (never probed)."
+}

addedInput schema / properties / source

Added value: +{
+  "anyOf": [
+    {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "Where the listing came from (any of), e.g. mcp_registry, x402_bazaar; 'none' for directly submitted ones."
+}

removedInput schema / properties / task_category / default
```
Removed value: -null
```
removedInput schema / properties / task_category / title
```
Removed value: -"Task Category"
```
removedInput schema / properties / trace_id / default
```
Removed value: -null
```

changedInput schema / properties / trace_id / description

Previous value: -"Continue a conversation: the trace_id a previous Concierge response returned. Omit on the first call."New value: +"trace_id from a previous response, to continue a conversation; omit on the first call."

removedInput schema / properties / trace_id / title
```
Removed value: -"Trace Id"
```
removedInput schema / title
```
Removed value: -"find_agentsArguments"
```

First observedOct 6, 2026

TDQS

A4.2/5.0

Behavior5/5

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

Goes well past the readOnly/idempotent annotations: it discloses the default result fields, the ranking, that result.more carries next-page calls, that match_quality "partial" means incomplete coverage, and that total is 0 on partial answers unless total_at_least is set. It also states 'Free, no key', removing auth uncertainty.

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?

Front-loads what it returns and the sources before the parenthetical-dense details. The single long paragraph with heavy semicolon/parenthesis chaining makes it harder to scan than a short bulleted structure would, but almost no sentence is 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?

With 17 parameters and no output schema, the description does the work of explaining the return shape (name, summary, price, health check, connection info, rank) and pagination contract. Only the relationship to sibling search_listings remains unexplained for a definition this complex.

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 coverage is 100%, so the baseline is 3, but the description adds real semantics: page 1 = ranks 11-35, view "full" returns every field, and mention that price caps or 'no api key' in the need text act as filters. Filter parameters like source and task_category are left 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 specific verb and resource ('Find AI agents, MCP servers and APIs') plus the concrete sources it aggregates (MCP Registry, x402 Bazaar, Agentic.Market, direct listings). It never clarifies how it relates to the sibling search_listings, so the agent must guess which is the general search entry point.

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?

Gives actionable usage: describe the need in plain words, limit caps at 10, page continues at rank 11, view "full" for every field, and it explicitly routes depth lookups to describe_listing and facets to list_facets. It stops short of stating when to prefer this over search_listings.

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

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