Agent Skills · JSON Structure

Agent Skills Tool Call Structure

An AI agent's invocation of a tool skill with specific input parameters.

Type: object Properties: 4 Required: 4
Agent SkillsAI AgentsTool UseFunction CallingMCPAgentic AIAutomation

ToolCall is a JSON Structure definition published by Agent Skills, describing 4 properties, of which 4 are required. It conforms to the https://json-structure.org/meta/core/v0/# meta-schema.

Properties

id type name input

Meta-schema: https://json-structure.org/meta/core/v0/#

JSON Structure

agent-skills-tool-call-structure.json Raw ↑
{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/agent-skills/refs/heads/main/json-structure/agent-skills-tool-call-structure.json",
  "name": "ToolCall",
  "description": "An AI agent's invocation of a tool skill with specific input parameters.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique identifier for this tool call instance.",
      "example": "toolu_01A09q90qw90lq917835lq9"
    },
    "type": {
      "type": "string",
      "description": "Content block type, always tool_use.",
      "example": "tool_use"
    },
    "name": {
      "type": "string",
      "description": "Name of the tool being called.",
      "example": "get_weather"
    },
    "input": {
      "type": "object",
      "description": "Input parameters provided to the tool, conforming to the tool's input_schema.",
      "example": {
        "location": "San Francisco, CA"
      }
    }
  },
  "required": [
    "id",
    "type",
    "name",
    "input"
  ]
}

Work with this as data

Every JSON Structure here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for json structure

4 MCP tools reach this
  • find_json_structuresBrowse and filter every JSON Structure in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This JSON Structure
curl "https://apis.io/api/v1/json-structures/agent-skills-tool-call-structure"
All json structure
curl "https://apis.io/api/v1/json-structures?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.