Misfit Machine Store

Search Misfit machine products

search_catalog

Read-onlyIdempotent

Read-only product discovery. Call this first when you do not know a product ID. Returns matching machine-consumable products with current price, availability, and machine endpoint metadata. No cart, checkout, order, payment, credential, or merchant mutation occurs. Use lookup_catalog when IDs are known; use get_product after selecting one product.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "meta": "<meta>",
      "catalog": "<catalog>"
    },
    "name": "search_catalog"
  }
}

Input Schema

Name	Required	Description	Default
`meta`	Yes	UCP caller metadata for capability negotiation only. This server is read-only.
`catalog`	Yes	Search request. Minimal valid shape: {query:"change monitoring"}. Query may be omitted for default discovery.

Output Schema

Name	Required	Description	Default
`ucp`	Yes
`messages`	No
`products`	Yes
`pagination`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedAug 22, 2026

addedInput schema / properties / catalog / properties / pagination / additionalProperties
```
Added value: +true
```

addedInput schema / properties / catalog / properties / pagination / properties

Added value: +{
+  "cursor": {
+    "description": "Opaque cursor returned by a prior search response.",
+    "type": "string"
+  },
+  "limit": {
+    "description": "Maximum products to return; backend default is 10.",
+    "maximum": 50,
+    "minimum": 1,
+    "type": "integer"
+  }
+}

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "UCP catalog search response. Products are read-only discovery results.",
+  "properties": {
+    "messages": {
+      "type": "array"
+    },
+    "pagination": {
+      "additionalProperties": true,
+      "properties": {
+        "cursor": {
+          "type": "string"
+        },
+        "has_next_page": {
+          "type": "boolean"
+        },
+        "total_count": {
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "products": {
+      "items": {
+        "additionalProperties": true,
+        "description": "Current machine-consumable Misfit catalog product. Checkout URLs, when present, are handoff metadata only and do not authorize purchase.",
+        "properties": {
+          "categories": {
+            "type": "array"
+          },
+          "description": {
+            "type": "object"
+          },
+          "handle": {
+            "type": "string"
+          },
+          "id": {
+            "type": "string"
+          },
+          "metadata": {
+            "type": "object"
+          },
+          "price_range": {
+            "type": "object"
+          },
+          "title": {
+            "type": "string"
+          },
+          "url": {
+            "type": "string"
+          },
+          "variants": {
+            "type": "array"
+          }
+        },
+        "required": [
+          "id",
+          "title"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "ucp": {
+      "additionalProperties": true,
+      "properties": {
+        "capabilities": {
+          "type": "object"
+        },
+        "status": {
+          "type": "string"
+        },
+        "version": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "version",
+        "status"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "ucp",
+    "products"
+  ],
+  "type": "object"
+}

Changed10 schema fields changedAug 21, 2026

changedInput schema / properties / catalog / description

Previous value: -"Catalog search request."New value: +"Search request. Minimal valid shape: {query:\"change monitoring\"}. Query may be omitted for default discovery."

changedInput schema / properties / catalog / properties / attribution / description

Previous value: -"Optional source/channel attribution metadata used for discovery analytics, not billing authorization."New value: +"Optional discovery attribution. Suggested fields: source (registry/client/platform), channel, campaign, referrer. Attribution is analytics metadata only and never authorizes billing."

changedInput schema / properties / catalog / properties / context / description

Previous value: -"Optional UCP context supplied by the caller; passed through to the catalog service."New value: +"Optional UCP caller context."

changedInput schema / properties / catalog / properties / filters / description

Previous value: -"Optional catalog filters supported by the UCP backend."New value: +"Optional backend-supported filters."

changedInput schema / properties / catalog / properties / pagination / description

Previous value: -"Optional pagination controls supported by the UCP backend."New value: +"Optional pagination controls."

changedInput schema / properties / catalog / properties / query / description

Previous value: -"Natural-language or keyword query such as 'A2A audit', 'change monitoring', or 'machine commerce'. Empty/omitted query may return the default discoverable catalog."New value: +"Natural-language or keyword query, e.g. 'A2A audit', 'change monitoring', or 'machine commerce'."

changedInput schema / properties / catalog / properties / signals / description

Previous value: -"Optional machine-selection signals supplied by the caller; passed through without side effects."New value: +"Optional machine-selection signals."

changedInput schema / properties / meta / description

Previous value: -"UCP caller metadata used only for capability negotiation; this read-only server does not mutate carts, orders, payments, credentials, or merchant data."New value: +"UCP caller metadata for capability negotiation only. This server is read-only."

changedInput schema / properties / meta / properties / ucp-agent / description

Previous value: -"Calling UCP agent identity/profile metadata."New value: +"Calling UCP agent metadata."

changedInput schema / properties / meta / properties / ucp-agent / properties / profile / description

Previous value: -"Absolute URI of the caller's UCP profile document. Required on every catalog tool call."New value: +"Absolute URI of the caller's UCP profile. Required on every call."

Changed10 schema fields changedAug 21, 2026

addedInput schema / properties / catalog / description
```
Added value: +"Catalog search request."
```

addedInput schema / properties / catalog / properties / attribution / description

Added value: +"Optional source/channel attribution metadata used for discovery analytics, not billing authorization."

addedInput schema / properties / catalog / properties / context / description

Added value: +"Optional UCP context supplied by the caller; passed through to the catalog service."

addedInput schema / properties / catalog / properties / filters / description
```
Added value: +"Optional catalog filters supported by the UCP backend."
```
addedInput schema / properties / catalog / properties / pagination / description
```
Added value: +"Optional pagination controls supported by the UCP backend."
```

addedInput schema / properties / catalog / properties / query / description

Added value: +"Natural-language or keyword query such as 'A2A audit', 'change monitoring', or 'machine commerce'. Empty/omitted query may return the default discoverable catalog."

addedInput schema / properties / catalog / properties / signals / description

Added value: +"Optional machine-selection signals supplied by the caller; passed through without side effects."

addedInput schema / properties / meta / description

Added value: +"UCP caller metadata used only for capability negotiation; this read-only server does not mutate carts, orders, payments, credentials, or merchant data."

addedInput schema / properties / meta / properties / ucp-agent / description
```
Added value: +"Calling UCP agent identity/profile metadata."
```

addedInput schema / properties / meta / properties / ucp-agent / properties / profile / description

Added value: +"Absolute URI of the caller's UCP profile document. Required on every catalog tool call."

First observedAug 14, 2026

TDQS

A5/5.0

Behavior5/5

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

Explicitly states it is read-only, returns matching products with price, availability, and endpoint metadata; clarifies no cart, checkout, order, payment, credential, or merchant mutation occurs. Annotations (readOnly=true, idempotent=true, destructive=false) align with the description, so no contradiction. This is a model of behavioral transparency.

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 description is concise but informative, using clear bullet-style clauses. The schema is well-structured with nested objects and clear descriptions. The additional text explaining when to call and what does not happen is efficient and not verbose.

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?

The description provides full context: it states read-only semantics, what the tool returns, what it doesn't do, and how it fits into a workflow (use lookup_catalog when IDs are known, get_product after selecting). It covers usage scenarios shortages (like knowing product ID) and highlights non-mutations. The schema explains required fields and optional fields. This is highly complete.

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

Parameters5/5

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

The schema provides detailed descriptions for each parameter: meta explains it's for capability negotiation and is read-only; catalog describes its role as a search request with query, context, filters, signals, and pagination. The 'query' parameter has examples and pagination has min/max and descriptions. The schema description coverage is 100% per the metadata, and the description provides additional examples and clarifies optional fields. Parameters are well-documented.

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?

Title and description clearly state the tool's purpose: searching Misfit machine products. It explicitly mentions it is read-only product discovery and says to call it first when the product ID is unknown, with clear next steps (lookup_catalog, get_product).

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

Usage Guidelines5/5

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

Provides strong usage context: call this when product ID is unknown, use lookup_catalog when IDs are known, and use get_product after selecting a product. Also explains the purpose of the tool in the discovery flow, making usage guidelines excellent.

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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