Agent Diff

Agent Diff creates isolated, ephemeral replicas of third-party APIs (Slack, Linear, GitHub). Agents interact with these sandboxes to produce deterministic state-change diffs without side effects, rate limits, or real API calls. Ideal for testing AI agents that interact with external APIs.

Agent Diff publishes 2 APIs on the APIs.io network: Diffs API and Sandboxes API. Tagged areas include API Testing, AI Agents, Sandboxing, API Diffing, and Developer Tools.

The Agent Diff catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Agent Diff’s developer surface includes authentication, developer portal, getting-started guide, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

37.7/100 thin ▬ flat Agent 31/100 agent ready Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

API Testing AI Agents SandboxingAPI DiffingDeveloper Tools

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 37.7/100 · thin

Contract Quality 14.9 / 23

Developer Ergonomics 6.0 / 18

Access Clarity 2.8 / 18

Operational Transparency 0.9 / 12

Contract Governance 3.1 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/agent-diff: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Agent Diff Diffs API

The Diffs API from Agent Diff — 1 operation(s) for diffs.

Agent Diff Sandboxes API

The Sandboxes API from Agent Diff — 2 operation(s) for sandboxes.

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Agent Diff Sandbox Diffs API

OPEN COLLECTION

Agent Diff Sandbox API

OPEN COLLECTION

Agent Diff Sandbox Diffs Sandboxes API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Agent Diff Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Agent Diff Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Agent Diff Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Agent Diff Sandbox Context

6 classes · 15 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Agent Diff API Rules

5 rules · 4 warnings 1 info

SPECTRAL

Agent Diff API Rules

30 rules · 14 errors 16 warnings

SPECTRAL

JSON Schema 5

Standalone JSON Schema definitions for this provider's data models.

DiffEntry

5 properties

JSON SCHEMA

DiffList

2 properties

JSON SCHEMA

SandboxCreateRequest

4 properties

JSON SCHEMA

SandboxList

2 properties

JSON SCHEMA

Sandbox

7 properties

JSON SCHEMA

JSON Structure 5

JSON Structure definitions describing this provider's data shapes.

Sandbox Diff Entry Structure

5 properties

JSON STRUCTURE

Sandbox Diff List Structure

2 properties

JSON STRUCTURE

Sandbox Sandbox Create Request Structure

4 properties

JSON STRUCTURE

Sandbox Sandbox List Structure

2 properties

JSON STRUCTURE

Sandbox Sandbox Structure

7 properties

JSON STRUCTURE

Examples 5

Example request and response payloads for these APIs.

Sandbox Diff Entry Example

5 fields

EXAMPLE

Sandbox Diff List Example

2 fields

EXAMPLE

Sandbox Sandbox Create Request Example

4 fields

EXAMPLE

Sandbox Sandbox Example

7 fields

EXAMPLE

Sandbox Sandbox List Example

2 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Agent Diff Authentication

http · 1 scheme

SECURITY

Agent Diff Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Agent Diff Agentic Access

5 operations · 2 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

JSONSchema

JSONSchema

JSONSchema

JSONSchema

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

SpectralRules

SpectralRules

JSONLDContext

JSONLDContext

Vocabulary

Vocabulary

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Source (apis.yml)

aid: agent-diff
name: Agent Diff
description: Agent Diff creates isolated, ephemeral replicas of third-party APIs (Slack, Linear, GitHub). Agents interact
  with these sandboxes to produce deterministic state-change diffs without side effects, rate limits, or real API calls. Ideal
  for testing AI agents that interact with external APIs.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/agent-diff.png
tags:
- API Testing
- AI Agents
- Sandboxing
- API Diffing
- Developer Tools
created: '2026-01-02'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/agent-diff/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: agent-diff:agent-diff-diffs-api
  name: Agent Diff Diffs API
  description: The Diffs API from Agent Diff — 1 operation(s) for diffs.
  humanURL: https://www.agentdiff.dev/
  baseURL: https://api.agentdiff.dev/v1
  tags:
  - Diffs
  properties:
  - type: OpenAPI
    url: openapi/agent-diff-diffs-api-openapi.yml
  - type: Documentation
    url: https://www.agentdiff.dev/
- aid: agent-diff:agent-diff-sandboxes-api
  name: Agent Diff Sandboxes API
  description: The Sandboxes API from Agent Diff — 2 operation(s) for sandboxes.
  humanURL: https://www.agentdiff.dev/
  baseURL: https://api.agentdiff.dev/v1
  tags:
  - Sandboxes
  properties:
  - type: OpenAPI
    url: openapi/agent-diff-sandboxes-api-openapi.yml
  - type: Documentation
    url: https://www.agentdiff.dev/
features:
- Isolated Ephemeral API Sandbox Replicas
- Deterministic State-Change Diff Generation
- No Rate Limits or Side Effects in Sandboxes
- Support for Slack, Linear, and GitHub APIs
- Scenario-Based Seed Data for Reproducible Tests
- TTL-Based Sandbox Expiration
- Diff Tracking for All Agent Operations
useCases:
- AI Agent Integration Testing Against Third-Party APIs
- Regression Testing for Agent Workflows
- Deterministic CI/CD Pipeline Testing for Agents
- Debugging Agent Behavior Without Real API Calls
- Benchmarking Agent Performance Against Known States
integrations:
- Slack API Sandbox
- Linear API Sandbox
- GitHub API Sandbox
- CI/CD Pipeline Integration
- LangChain Agent Testing
- OpenAI Function Calling Testing
common:
- type: AgenticAccess
  url: agentic-access/agent-diff-agentic-access.yml
- type: DomainSecurity
  url: security/agent-diff-domain-security.yml
- type: Authentication
  url: authentication/agent-diff-authentication.yml
- url: https://www.agentdiff.dev/
  type: Portal
- url: https://www.agentdiff.dev/docs
  type: GettingStarted
- url: https://raw.githubusercontent.com/api-evangelist/agent-diff/refs/heads/main/rules/agent-diff-spectral-rules.yml
  type: SpectralRules
- url: https://raw.githubusercontent.com/api-evangelist/agent-diff/refs/heads/main/json-schema/agent-diff-sandbox-sandbox-schema.json
  type: JSONSchema
- url: https://raw.githubusercontent.com/api-evangelist/agent-diff/refs/heads/main/json-schema/agent-diff-sandbox-diff-entry-schema.json
  type: JSONSchema
- url: https://raw.githubusercontent.com/api-evangelist/agent-diff/refs/heads/main/json-ld/agent-diff-sandbox-context.jsonld
  type: JSONLDContext
- url: https://raw.githubusercontent.com/api-evangelist/agent-diff/refs/heads/main/vocabulary/agent-diff-vocabulary.yaml
  type: Vocabulary
- type: LlmsText
  url: https://www.agentdiff.dev/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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