Codex Pets Registry

Get install instructions

get_install_instructions

Read-onlyIdempotent

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.

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": {
      "slug": "<slug>"
    },
    "name": "get_install_instructions"
  }
}

Input Schema

Name	Required	Description	Default
`slug`	Yes	Exact slug of an approved public Codex pet.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedJul 17, 2026

changedInput schema / properties / slug / description

Previous value: -"Approved Codex pet slug."New value: +"Exact slug of an approved public Codex pet."

Changed1 schema field changedJul 16, 2026

changedInput schema / properties / slug / description

Previous value: -"Exact slug of an approved public Codex pet."New value: +"Approved Codex pet slug."

Changed1 schema field changedMay 18, 2026

changedInput schema / properties / slug / description

Previous value: -"Approved Codex pet slug."New value: +"Exact slug of an approved public Codex pet."

First observedMay 17, 2026

TDQS

A4.5/5.0

Behavior4/5

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.

Conciseness5/5

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.

Completeness5/5

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.

Parameters3/5

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.

Purpose5/5

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.

Usage Guidelines5/5

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.

All Codex Pets Registry tools Inspect

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