Codex Pets Registry
Server Details
Search, preview, install community Codex pet packs, and discover the pet request flow.
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP
- URL
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Tool Definition Quality
Average 4.5/5 across 7 of 7 tools scored.
Each tool has a clearly distinct purpose with explicit guidance on when to use it and references to alternatives, eliminating ambiguity.
All tool names follow a consistent verb_noun pattern (get_ or search_ + specific noun), making the pattern predictable.
7 tools cover the server's read-only retrieval scope perfectly without excess or deficiency.
The tool set fully covers the domain of retrieving approved pet information and understanding the request process, with no gaps for its stated read-only purpose.
Available Tools
7 toolsget_badge_codeGet README badge codeARead-onlyIdempotentInspect
Use for a known approved pet slug when the user needs README badge Markdown, HTML, or SVG URL. Do not use for animated README cards, website iframe embeds, install instructions, or pet discovery; use get_card_code, get_embed_code, get_install_instructions, or search_pets instead.
| Name | Required | Description | Default |
|---|---|---|---|
| slug | Yes | Exact slug of an approved public Codex pet. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate read-only, idempotent, non-destructive behavior. Description adds that output includes Markdown, HTML, or SVG URL, which are behavioral details not covered by annotations. Could mention more about prerequisites or error handling, but sufficient given annotations.
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?
Two sentences, front-loaded with purpose, second sentence providing exclusions and alternatives. No wasted words.
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?
For a simple one-parameter tool with no output schema, the description covers what it returns, constraints (approved pet slug), and when to avoid. Complete given the tool's simplicity and rich annotations.
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?
Schema coverage is 100%, so the parameter 'slug' is fully documented. The description reinforces that it must be an exact slug of an approved pet but adds no new semantic detail beyond the schema.
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 purpose: generating README badge Markdown, HTML, or SVG URL for a known approved pet slug. It distinguishes from siblings by explicitly naming alternatives for other use cases.
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?
Explicitly provides when to use (known approved pet slug, need badge code) and when not to use (animated cards, iframe embeds, install instructions, pet discovery), listing specific alternative tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_card_codeGet animated README card codeARead-onlyIdempotentInspect
Use for a known approved pet slug when the user needs animated README card Markdown, HTML, or GIF URL. Do not use for simple badges, website iframe embeds, install instructions, or pet discovery; use get_badge_code, get_embed_code, get_install_instructions, or search_pets instead.
| Name | Required | Description | Default |
|---|---|---|---|
| slug | Yes | Exact slug of an approved public Codex pet. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate safe, read-only, idempotent behavior. The description adds context that the input must be an 'approved' pet slug and that the output includes Markdown, HTML, or GIF URL, which is useful beyond the annotations.
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?
Two concise sentences, front-loaded with the core purpose and conditional usage. No wasted words.
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?
Given the simple tool (one parameter, rich annotations, no output schema), the description sufficiently covers input and output types. It could mention the exact format of the returned code but is complete enough for selection and invocation.
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?
Schema coverage is 100% and the parameter 'slug' is well-described in the schema. The description reinforces the requirement ('known approved pet slug') but does not add significant new meaning beyond the schema.
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 purpose: retrieving animated README card code (Markdown, HTML, or GIF URL) for a known approved pet slug. It distinguishes itself from siblings by listing specific alternative tools for other use cases.
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 on when to use (for a known approved pet slug needing animated README card code) and when not to use (badges, embeds, install instructions, pet discovery), with named alternative tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_embed_codeGet website embed codeARead-onlyIdempotentInspect
Use for a known approved pet slug when the user needs website iframe embed HTML or an embed URL. Do not use for README badges/cards, install instructions, or pet discovery; use get_badge_code, get_card_code, get_install_instructions, or search_pets instead.
| Name | Required | Description | Default |
|---|---|---|---|
| slug | Yes | Exact slug of an approved public Codex pet. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description mentions 'approved public Codex pet' which adds context about authorization, but does not disclose additional behavioral traits beyond the schema and annotations.
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?
Two sentences with no waste. The key information is front-loaded and every sentence earns its place, providing purpose and exclusions efficiently.
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?
For a simple tool with one parameter, good annotations, and no output schema, the description covers when to use, what it returns, and what not to use it for. No gaps given the tool's complexity.
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?
Schema coverage is 100% for the single required 'slug' parameter, which has a description. The description does not add extra semantic meaning beyond what the schema provides.
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?
Description clearly states the tool retrieves website embed HTML or URL for a known approved pet slug. It uses specific verbs ('get website iframe embed HTML or an embed URL') and distinguishes from sibling tools like get_badge_code.
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?
Explicitly states when to use (known approved pet slug, needs embed) and when not to use (README badges/cards, install instructions, pet discovery) with named alternative tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_install_instructionsGet install instructionsARead-onlyIdempotentInspect
Use for a known approved pet slug when the user wants CLI or manual install instructions. Do not use to search for pets or inspect general metadata; use search_pets or get_pet instead. This tool is read-only and does not increment install or download counters.
| Name | Required | Description | Default |
|---|---|---|---|
| slug | Yes | Exact slug of an approved public Codex pet. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnlyHint, destructiveHint, and idempotentHint. The description adds useful context that it does not increment install/download counters, going beyond annotations.
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?
Two sentences, no redundant information, front-loaded with the primary purpose, and each sentence adds value.
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?
For a simple tool with one parameter, good schema, and clear description that covers purpose, usage boundaries, and behavioral traits, it is fully complete.
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?
Schema coverage is 100% with clear description of the 'slug' parameter. The description does not add new details about the parameter, so baseline score of 3 applies.
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 provides CLI or manual install instructions for a known approved pet slug, and distinguishes from sibling tools search_pets and get_pet by stating what it should not be used for.
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?
Explicitly states when to use (user wants install instructions for approved pet slug) and when not to use (search/inspect metadata), with named alternative tools (search_pets, get_pet).
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_petGet Codex petARead-onlyIdempotentInspect
Use when you already have an exact approved pet slug and need the sanitized public pet card, asset URLs, page URL, and install command for that one pet. Use search_pets first when you only have a name/query or need multiple results. Do not use for focused install, badge, embed, card, or request workflow details; use the matching get_* tool instead.
| Name | Required | Description | Default |
|---|---|---|---|
| slug | Yes | Exact slug of an approved public Codex pet. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnlyHint=true, idempotentHint=true, destructiveHint=false. The description adds the return types (sanitized card, asset URLs, page URL, install command), providing useful behavioral context beyond annotations.
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?
Two sentences, front-loaded with purpose and usage condition. No wasted words; every sentence adds value.
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 required parameter, rich annotations, and clear return behavior described, the description is fully sufficient for an 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?
Only one parameter (slug) with 100% schema coverage. Description confirms it expects an exact approved pet slug, adding no new syntax or constraints beyond the schema. Baseline of 3 is appropriate.
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 retrieves a specific pet's public card, assets, page URL, and install command using an exact approved slug. It distinguishes itself from sibling tools like search_pets by specifying the exact slug requirement.
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?
Explicitly says to use when you have an exact slug and need pet details; advises to use search_pets first for name/query or multiple results. Also warns against using for other specific get_* tools, providing clear alternatives.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_pet_request_infoGet pet request infoARead-onlyIdempotentInspect
Use when the user wants to request a new Codex pet or understand the public request form fields and reference image limits. Do not use to create, submit, update, or inspect private generation requests; no MCP tool exposes those operations. Use search_pets or get_pet for existing approved pets.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false. The description adds clarity by stating it does not create/submit/update private requests, reinforcing non-destructive behavior. No contradiction.
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?
Two sentences with no filler. The first sentence states the primary use, the second clarifies exclusions. Every word earns its place.
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?
For a simple info-retrieval tool with no parameters and no output schema, the description sufficiently explains the tool's scope and boundaries. Could mention return format but not essential given simplicity.
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 tool has zero parameters, so the input schema covers everything. Baseline score of 4 is appropriate as description doesn't need to add parameter meaning.
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 uses a specific verb 'request' and resource 'pet info', clearly stating the tool's purpose. It distinguishes from siblings like get_pet and search_pets by focusing on request-related info.
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?
Explicitly specifies when to use (user wants to request a new pet or understand form fields) and when not to (create, submit, update, or inspect private requests). Mentions alternatives (search_pets, get_pet) for existing pets.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
search_petsSearch Codex petsARead-onlyIdempotentInspect
Use to discover one or more approved public Codex pet packs by query, kind, tags, author, or Codex compatibility. Prefer this over get_pet when you do not already have an exact slug or need multiple candidates. Do not use for private generation requests or known-slug install/share snippets; use get_pet_request_info or a slug-specific get_* tool instead.
| Name | Required | Description | Default |
|---|---|---|---|
| kind | No | Optional pet kind filter. Use all or omit the field to include every kind. | |
| tags | No | Optional tag filter as a comma-separated string or array. All provided tags must match. | |
| limit | No | Optional maximum result count. Defaults to 10 and is clamped to 1-60. | |
| query | No | Optional text matched against approved pet names, descriptions, tags, and authors. | |
| author | No | Optional author name text matched against the public submitter name. | |
| compatibleWith | No | Optional compatibility filter. Use codex for Codex-compatible pets; other values return no matches. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint, destructiveHint. The description adds behavioral context: it searches only approved public pets, not private ones, and explains that compatibleWith='codex' returns only Codex-compatible pets. No contradictions.
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?
Two sentences: first states purpose and filters, second provides usage boundaries and sibling alternatives. No redundant words. Every sentence adds value.
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 6 optional parameters, no output schema, and no required fields, the description adequately covers scope and usage boundaries. Could optionally mention pagination or result format, but for a simple search tool this is sufficient.
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?
Schema description coverage is 100%, so the schema already documents all parameters with descriptions. The description lists parameter categories (query, kind, tags, author, Codex compatibility) but adds no new syntactic or semantic detail beyond the schema. Baseline 3 applies.
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 states the exact purpose: discovering approved public Codex pet packs by various filters. It uses specific verbs (discover) and resources (pet packs), and explicitly distinguishes from siblings like get_pet (for exact slug) and get_pet_request_info (for private requests).
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 when-to-use ('Use to discover...') and when-not-to-use ('Do not use for private generation requests or known-slug...'), with clear alternatives named (get_pet_request_info, slug-specific get_* tools). This leaves no ambiguity about context.
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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