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 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

35.9/100 thin ▬ flat Agent 31/100 agent ready Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

API Testing AI Agents SandboxingAPI DiffingDeveloper Tools

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 35.9/100 · thin

Contract Quality 11.3 / 19

Developer Ergonomics 5.0 / 15

Access Clarity 2.4 / 15

Operational Transparency 0.8 / 10

Contract Governance 2.5 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.5 / 15

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

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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

Company 1

The organization behind the API

Website

Website

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: '2026-09-16'
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:
  - Sandbox
  tags_raw:
  - 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: Website
  url: https://agentdiff.dev
- 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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