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Agent Tool

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Overview

What is Agent Tool?

Tool model

Specification

Contracts

Tool declaration

Tool interface

Tool surface

Input and output contracts

Execution profile

Execution pipeline

Hooks and input mutation

Permission profile

Permission decision

Invocation lifecycle

Concurrency and scheduling

Deferred loading and tool search

Progress and cancellation

Result envelope

Result persistence and rendering

Resource and artifact refs

Errors and retries

Interoperability

For implementors

Implementation quickstart

Acceptance scenarios

Examples

Shell command with sandbox

Deferred MCP discovery

Permission denied with retry

Large result persistence

Parallel read tools

MCP search tool

Local file read

Browser action

Image generation task

Tool search

Reference

Glossary

Agent standards ecosystem

JSON Schemas

Ecosystem boundaries

Research sources

Source analysis

Versions

v0.2.0 overview

v0.2.0 specification

v0.2.0 changelog

v0.1.1 overview

v0.1.1 specification

v0.1.1 changelog

v0.1.0 overview

v0.1.0 specification

v0.1.0 changelog

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v0.1.0 Specification

This version snapshots the first public Agent Tool draft. See the latest specification for the normative draft text.

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Draft standard for portable agent tool declarations, runtime interfaces, invocations, progress, results, permissions, scheduling, and audit refs.

v0.1.0 Specification ​

v0.1.0 Specification