list_breedsSearch dog breeds with pagination. Returns breed names, IDs, weight ranges, life spans, and hypoallergenic status. Use get_breed for detailed info on a specific breed.
| Name | Required | Description | Default |
|---|---|---|---|
| page | No | Page number for pagination (default: 1) |
| Name | Required | Description | Default |
|---|---|---|---|
| page | Yes | Page number requested | |
| total | Yes | Total count of breeds available | |
| breeds | Yes | Array of dog breeds on this page |
Changes observed during successful MCP inspections.
Input schema / examplesAdded value: +[
+ {
+ "page": 1
+ },
+ {
+ "page": 2
+ }
+]Output schema / (root)Previous value: -nullNew value: +{
+ "properties": {
+ "breeds": {
+ "description": "Array of dog breeds on this page",
+ "items": {
+ "properties": {
+ "description": {
+ "description": "Breed description",
+ "type": "string"
+ },
+ "female_weight_kg": {
+ "description": "Female weight range",
+ "properties": {
+ "max": {
+ "description": "Maximum weight in kg",
+ "type": "number"
+ },
+ "min": {
+ "description": "Minimum weight in kg",
+ "type": "number"
+ }
+ },
+ "required": [
+ "min",
+ "max"
+ ],
+ "type": "object"
+ },
+ "hypoallergenic": {
+ "description": "Whether breed is hypoallergenic",
+ "type": "boolean"
+ },
+ "id": {
+ "description": "Unique breed identifier",
+ "type": "string"
+ },
+ "life_span_years": {
+ "description": "Life span range",
+ "properties": {
+ "max": {
+ "description": "Maximum lifespan in years",
+ "type": "number"
+ },
+ "min": {
+ "description": "Minimum lifespan in years",
+ "type": "number"
+ }
+ },
+ "required": [
+ "min",
+ "max"
+ ],
+ "type": "object"
+ },
+ "male_weight_kg": {
+ "description": "Male weight range",
+ "properties": {
+ "max": {
+ "description": "Maximum weight in kg",
+ "type": "number"
+ },
+ "min": {
+ "description": "Minimum weight in kg",
+ "type": "number"
+ }
+ },
+ "required": [
+ "min",
+ "max"
+ ],
+ "type": "object"
+ },
+ "name": {
+ "description": "Breed name",
+ "type": "string"
+ }
+ },
+ "required": [
+ "id",
+ "name",
+ "description",
+ "life_span_years",
+ "male_weight_kg",
+ "female_weight_kg",
+ "hypoallergenic"
+ ],
+ "type": "object"
+ },
+ "type": "array"
+ },
+ "page": {
+ "description": "Page number requested",
+ "type": "number"
+ },
+ "total": {
+ "description": "Total count of breeds available",
+ "type": [
+ "number",
+ "null"
+ ]
+ }
+ },
+ "required": [
+ "page",
+ "total",
+ "breeds"
+ ],
+ "type": "object"
+}Input schema / examplesRemoved value: -[
- {
- "page": 1
- },
- {
- "page": 2
- }
-]Output schema / (root)Previous value: -{
- "properties": {
- "breeds": {
- "description": "Array of dog breeds on this page",
- "items": {
- "properties": {
- "description": {
- "description": "Breed description",
- "type": "string"
- },
- "female_weight_kg": {
- "description": "Female weight range",
- "properties": {
- "max": {
- "description": "Maximum weight in kg",
- "type": "number"
- },
- "min": {
- "description": "Minimum weight in kg",
- "type": "number"
- }
- },
- "required": [
- "min",
- "max"
- ],
- "type": "object"
- },
- "hypoallergenic": {
- "description": "Whether breed is hypoallergenic",
- "type": "boolean"
- },
- "id": {
- "description": "Unique breed identifier",
- "type": "string"
- },
- "life_span_years": {
- "description": "Life span range",
- "properties": {
- "max": {
- "description": "Maximum lifespan in years",
- "type": "number"
- },
- "min": {
- "description": "Minimum lifespan in years",
- "type": "number"
- }
- },
- "required": [
- "min",
- "max"
- ],
- "type": "object"
- },
- "male_weight_kg": {
- "description": "Male weight range",
- "properties": {
- "max": {
- "description": "Maximum weight in kg",
- "type": "number"
- },
- "min": {
- "description": "Minimum weight in kg",
- "type": "number"
- }
- },
- "required": [
- "min",
- "max"
- ],
- "type": "object"
- },
- "name": {
- "description": "Breed name",
- "type": "string"
- }
- },
- "required": [
- "id",
- "name",
- "description",
- "life_span_years",
- "male_weight_kg",
- "female_weight_kg",
- "hypoallergenic"
- ],
- "type": "object"
- },
- "type": "array"
- },
- "page": {
- "description": "Page number requested",
- "type": "number"
- },
- "total": {
- "description": "Total count of breeds available",
- "type": [
- "number",
- "null"
- ]
- }
- },
- "required": [
- "page",
- "total",
- "breeds"
- ],
- "type": "object"
-}New value: +nullOutput schema / (root)Previous value: -nullNew value: +{
+ "properties": {
+ "breeds": {
+ "description": "Array of dog breeds on this page",
+ "items": {
+ "properties": {
+ "description": {
+ "description": "Breed description",
+ "type": "string"
+ },
+ "female_weight_kg": {
+ "description": "Female weight range",
+ "properties": {
+ "max": {
+ "description": "Maximum weight in kg",
+ "type": "number"
+ },
+ "min": {
+ "description": "Minimum weight in kg",
+ "type": "number"
+ }
+ },
+ "required": [
+ "min",
+ "max"
+ ],
+ "type": "object"
+ },
+ "hypoallergenic": {
+ "description": "Whether breed is hypoallergenic",
+ "type": "boolean"
+ },
+ "id": {
+ "description": "Unique breed identifier",
+ "type": "string"
+ },
+ "life_span_years": {
+ "description": "Life span range",
+ "properties": {
+ "max": {
+ "description": "Maximum lifespan in years",
+ "type": "number"
+ },
+ "min": {
+ "description": "Minimum lifespan in years",
+ "type": "number"
+ }
+ },
+ "required": [
+ "min",
+ "max"
+ ],
+ "type": "object"
+ },
+ "male_weight_kg": {
+ "description": "Male weight range",
+ "properties": {
+ "max": {
+ "description": "Maximum weight in kg",
+ "type": "number"
+ },
+ "min": {
+ "description": "Minimum weight in kg",
+ "type": "number"
+ }
+ },
+ "required": [
+ "min",
+ "max"
+ ],
+ "type": "object"
+ },
+ "name": {
+ "description": "Breed name",
+ "type": "string"
+ }
+ },
+ "required": [
+ "id",
+ "name",
+ "description",
+ "life_span_years",
+ "male_weight_kg",
+ "female_weight_kg",
+ "hypoallergenic"
+ ],
+ "type": "object"
+ },
+ "type": "array"
+ },
+ "page": {
+ "description": "Page number requested",
+ "type": "number"
+ },
+ "total": {
+ "description": "Total count of breeds available",
+ "type": [
+ "number",
+ "null"
+ ]
+ }
+ },
+ "required": [
+ "page",
+ "total",
+ "breeds"
+ ],
+ "type": "object"
+}Input schema / examplesAdded value: +[
+ {
+ "page": 1
+ },
+ {
+ "page": 2
+ }
+]Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is clear. The description adds value by disclosing what the tool returns (breed names, IDs, weight ranges, life spans, hypoallergenic status) and that results are paginated. However, the use of the verb 'Search' is slightly misleading since the schema only includes a page parameter and no search query, which introduces minor ambiguity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is three concise sentences: the first states the core action, the second lists return fields, and the third directs to an alternative tool. There is no redundant wording, and each sentence contributes essential information, making it well-structured and efficient.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With one parameter, a schema that covers it fully, and annotations that establish safety, the description covers the tool's purpose, output, pagination, and alternative. There is no missing critical context for the agent to select and invoke the tool correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has 100% coverage: it fully documents the single 'page' parameter with description 'Page number for pagination (default: 1).' The description merely echoes 'with pagination' without adding additional semantic detail about the parameter's behavior, so it provides no value beyond the schema. Baseline 3 is appropriate given complete schema coverage.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool's function with a specific verb and resource: 'Search dog breeds with pagination.' It also lists the returned data fields (breed names, IDs, weight ranges, life spans, hypoallergenic status) and explicitly distinguishes it from get_breed, making the purpose unambiguous.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides explicit guidance by stating 'Use get_breed for detailed info on a specific breed,' which serves as an alternative tool for a different use case. This clearly indicates when to use list_breeds (browsing/searching multiple breeds) versus get_breed (deep dive on one breed).
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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