AgentIndex

AgentIndex is a curated directory of over 3,000 open-source AI agents, MCP servers, and agent frameworks. Updated daily, it provides reviews, selection guides, and detailed listings to help users discover and compare AI tools across categories. The platform also offers insights into MCP server implementations and community-driven rankings, serving developers, researchers, and enterprises seeking the best AI solutions in 2026.

AgentIndex is listed with 1 API on the APIs.io network. Tagged areas include Artificial Intelligence, Directory, Open Source, Tools, and MCP.

The AgentIndex catalog on APIs.io includes 1 Spectral governance ruleset.

AgentIndex’s developer surface includes documentation, API reference, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

13.5/100 emerging ▬ flat Agent 12/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 1 MCP Servers

Artificial Intelligence Directory Open Source Tools MCP

Kin Score

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

Composite quality — 13.5/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.5 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.0 / 15

Agent readiness — 12/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 10.5 — up to +17.9 composite points
Developer Ergonomics scores 14.8 — up to +17.0 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/agentindex-app/apis.yml: open an issue on github.com/api-evangelist/agentindex-app 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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 1

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

AgentIndex API

Public read‑only API for browsing agents, MCP servers and tools. No authentication required.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

AgentIndex MCP Server

Remote MCP server at agentindex.app.

MCP SERVER

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

AgentIndex API Rules

8 rules · 6 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Agentindex App Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Agentindex App Agentic Access

3 operations · 1 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

ErrorCatalog

ErrorCatalog

Conformance

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: agentindex-app
name: AgentIndex
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://agentindex.app/en/opengraph-image?d8eaa465c6d634ef
description: AgentIndex is a curated directory of over 3,000 open-source AI agents, MCP servers, and agent frameworks. Updated
  daily, it provides reviews, selection guides, and detailed listings to help users discover and compare AI tools across categories.
  The platform also offers insights into MCP server implementations and community-driven rankings, serving developers, researchers,
  and enterprises seeking the best AI solutions in 2026.
url: https://artifacts.apis.io/agentindex-app/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Artificial Intelligence
- Directory
- Open Source
- Tools
- MCP
tags_raw:
- AI
- Directory
- Open-Source
- Tools
- MCP
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/agentindex-app-agentic-access.yml
- type: Spectral
  url: rules/agentindex-app-rules.yml
- type: AgentSkill
  url: skills/_index.yml
- type: ErrorCatalog
  url: errors/agentindex-app-problem-types.yml
- type: Conformance
  url: conformance/agentindex-app-conformance.yml
- type: LLMsTxt
  url: llms/agentindex-app-llms.txt
- type: MCPServer
  url: mcp/agentindex-app-mcp.yml
- type: WellKnown
  url: well-known/agentindex-app-well-known.yml
- type: Hosts
  url: hosts/agentindex-app-hosts.yml
- type: Vendors
  url: vendors/agentindex-app-vendors.yml
- type: TermsOfService
  url: https://agentindex.app/en/terms/
- type: PrivacyPolicy
  url: https://agentindex.app/en/privacy/
- type: Documentation
  url: https://agentindex.app/en/guides/
- type: APIReference
  url: https://agentindex.app/llms.txt
- type: DomainSecurity
  url: security/agentindex-app-domain-security.yml
- type: Website
  url: https://agentindex.app/
apis:
- name: AgentIndex API
  description: Public read‑only API for browsing agents, MCP servers and tools. No authentication required.
  humanURL: https://agentindex.app/en/guides/
  baseURL: https://agentindex.app
  aid: agentindex-app:agentindex-api
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

AgentIndex API — frequently asked questions

Does AgentIndex have an API?

Yes. APIs.io lists 1 API from AgentIndex, including AgentIndex API.

Does AgentIndex have an MCP server?

Yes. APIs.io lists 1 MCP server for AgentIndex: Remote MCP server at agentindex.app.

Is the AgentIndex API ready for AI agents?

AgentIndex has a Kin Score of 13.5 out of 100 (emerging) and an Agent Readiness score of 12.1 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

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