# Agent Capability Contract

> ACC is an open, implementation-neutral declaration contract for marking which operations in existing business APIs may be exposed to agents, together with portable governance metadata. ACC controls reach; the business system controls authority.

## Primary documents

- [ACC Overview | Agent Capability Contract](https://agentcapability.org/docs/overview/): Overview of Agent Capability Contract, an open A2B declaration contract for agent-visible operations in existing business APIs.
- [ACC OpenAPI Quickstart | Agent Capability Contract](https://agentcapability.org/docs/quickstart/): Add ACC to an existing OpenAPI service, validate declarations, and understand the authoring tool boundary in five minutes.
- [ACC v1 Specification | Agent Capability Contract](https://agentcapability.org/docs/spec/): Normative ACC v1 fields, runtime requirements, approval semantics, safety boundaries, and versioning rules.
- [ACC Concepts | Agent Capability Contract](https://agentcapability.org/docs/concepts/): Core ACC concepts for A2B systems, including reach, authority, acting subjects, governance metadata, and runtime boundaries.
- [ACC in the Agent Governance Landscape](https://agentcapability.org/ecosystem/): An implementation-neutral map of ACC, OpenAPI, MCP, A2A, runtime control specifications, policy engines, secure gateways, workflows, and business authorization.
- [ACC Design Rationale and Boundaries](https://agentcapability.org/docs/design-rationale/): Why ACC keeps a small implementation-neutral core and which concerns belong to runtime policy, business authorization, workflow, and compliance layers.
- [ACC Implementer Guide | Agent Capability Contract](https://agentcapability.org/docs/implementer-guide/): Implementation-neutral guidance for parsers, generators, runtimes, policy components, conformance evidence, and safe A2B control planes.
- [ACC Governance | Agent Capability Contract](https://agentcapability.org/docs/governance/): Public governance, stewardship, versioning, proposal review, and implementation-neutral maintenance rules for ACC.
- [Contributing to Agent Capability Contract](https://agentcapability.org/docs/contributing/): How to propose changes, improve documentation, add conformance evidence, and contribute to the open ACC standard.
- [ACC Implementation Registry](https://agentcapability.org/docs/implementations/): Neutral registry of Agent Capability Contract implementations and their public self-assessment evidence.
- [ACC Binding Requirements](https://agentcapability.org/docs/bindings/): Common normative requirements for carrying ACC Core declarations across protocol-specific bindings.
- [ACC OpenAPI Binding](https://agentcapability.org/docs/openapi-binding/): The ACC OpenAPI extension binding for declaring agent-visible business operations beside existing API contracts.
- [ACC Conformance Overview](https://agentcapability.org/docs/conformance/): ACC conformance responsibilities, evidence expectations, and machine-readable reference vectors.
- [ACC Conformance Profiles](https://agentcapability.org/docs/conformance-profiles/): Parser, Generator, Runtime, and Policy Component profiles for precise ACC compatibility claims.
- [ACC Self-Assessment and Registration](https://agentcapability.org/docs/self-assessment/): Public evidence and self-assessment process for registering an ACC implementation without implying certification.
- [ACC v1 Machine-Readable Conformance Vectors](https://agentcapability.org/docs/conformance-v1/): Reference inputs and abstract expected outcomes for reproducible ACC v1 implementation evidence.
- [ACC Proposal Process](https://agentcapability.org/docs/proposals/): Open proposal states, evidence requirements, review criteria, and compatibility rules for evolving ACC.
- [ACC Draft Proposal: Agent-Facing Capability Deprecation](https://agentcapability.org/docs/proposals/agent-facing-deprecation/): A draft ACC proposal for portable agent-facing deprecation metadata; it is not part of released ACC v1.
- [ACC Changelog | Agent Capability Contract](https://agentcapability.org/docs/changelog/): Versioned changes to the Agent Capability Contract specification and conformance materials.
- [ACC v1.0.5 Release Notes](https://agentcapability.org/docs/releases/v1.0.5/): Detailed security-boundary and conformance-coverage notes for the ACC v1.0.5 release.
- [ACC v1.0.4 Release Notes](https://agentcapability.org/docs/releases/v1.0.4/): Detailed compatibility and authoring-tool notes for the ACC v1.0.4 OpenAPI authoring experience release.
- [ACC v1.0.3 Release Notes](https://agentcapability.org/docs/releases/v1.0.3/): Detailed compatibility and implementation notes for the ACC v1.0.3 Core and Binding architecture clarification release.
- [ACC v1.0.2 Release Notes](https://agentcapability.org/docs/releases/v1.0.2/): Detailed compatibility and implementation notes for the ACC v1.0.2 boundary, governance, and documentation clarification release.
- [ACC v1.0.1 Release Notes](https://agentcapability.org/docs/releases/v1.0.1/): Detailed compatibility and implementation notes for the ACC v1.0.1 approval-semantics and conformance release.
- [ACC v1.0.0 Release Notes](https://agentcapability.org/docs/releases/v1.0.0/): Detailed notes for the first stable Agent Capability Contract v1 specification release.
- [Agent Capability Contract（ACC）简体中文](https://agentcapability.org/zh-CN/): Agent Capability Contract 简体中文概览：为现有业务 API 声明 Agent 可触达操作及其治理语义。
- [5 分钟给现有 OpenAPI 服务加上 ACC](https://agentcapability.org/zh-CN/quickstart/): 给已有 OpenAPI 服务添加 ACC 声明、运行作者校验器并理解工具边界的中文快速上手。
- [ACC 核心概念与范围边界](https://agentcapability.org/zh-CN/concepts/): A2B、ACC、跨边界 Agent 行动治理问题，以及共同问题与 ACC v1 当前规范范围的区别。
- [ACC 设计依据与边界](https://agentcapability.org/zh-CN/design-rationale/): ACC 为什么保持小而中立的核心，以及权限、工作流、合规和运行时策略分别属于哪一层。

## Machine-readable resources

- [ACC v1 JSON Schema](https://agentcapability.org/schemas/acc.v1.schema.json)
- [ACC v1 conformance vectors](https://agentcapability.org/conformance/v1/vectors.json)
- [ACC v1 vector schema](https://agentcapability.org/conformance/v1/vectors.schema.json)
- [Public repository](https://github.com/agent-capability/agent-capability-contract)