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 API contracts indexed 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 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.4/100 thin ▬ flat Agent 30/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

API Testing AI Agents SandboxingAPI DiffingDeveloper Tools

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Software Product Engineering Management

BC-4200

Diffs

Software Release & Deployment Management

BC-4210

Sandboxes

POST /sandboxes

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 34.4/100 · thin

Contract Quality 11.3 / 19

Developer Ergonomics 5.0 / 15

Access Clarity 1.2 / 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 — 30/100 · 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 33.3 — up to +13.3 composite points
Operational Transparency scores 7.9 — up to +12.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/agent-diff/apis.yml: open an issue on github.com/api-evangelist/agent-diff to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 3

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

Agent Diff Sandbox Diffs API

OPEN COLLECTION

Agent Diff Sandbox API

OPEN COLLECTION

Agent Diff Sandbox Diffs Sandboxes API

OPEN COLLECTION

Agent Diff API pricing

Not yet checked against Agent Diff's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Agent Diff's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Agent Diff

SLA

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 — jsonschema 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

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

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
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  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: Plans
  url: plans/agent-diff-plans-pricing.yml
- type: RateLimits
  url: rate-limits/agent-diff-rate-limits.yml
- type: FinOps
  url: finops/agent-diff-finops.yml
- type: CapabilityMap
  url: capabilities/agent-diff-capability-edges.yml
  name: Agent Diff Business Capability Map
- 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

Agent Diff API — frequently asked questions

Does Agent Diff have an API?

Yes. APIs.io lists 2 APIs from Agent Diff, including Agent Diff Diffs API and Agent Diff Sandboxes API.

Is there an OpenAPI specification for the Agent Diff API?

Yes. APIs.io indexes 2 OpenAPI specifications for Agent Diff, each linked for download from this page.

How do I authenticate with the Agent Diff API?

Agent Diff uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Agent Diff Authentication.

How much does the Agent Diff API cost?

APIs.io lists 3 pricing plans for Agent Diff, with each plan's price, limits and inclusions under Pricing on this page.

Is the Agent Diff API ready for AI agents?

Agent Diff has a Kin Score of 34.4 out of 100 (thin) and an Agent Readiness score of 30.2 (agent-ready), scored by API Evangelist on 2026-11-06.

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