Agent Stack Directory

Agent Stack Directory is a curated directory of 84 AI agent tools and infrastructure, including cloud browsers, code sandboxes, memory, search APIs, email, payments, voice, and observability. It helps developers discover and compare services for building AI agents, providing up-to-date listings and pricing information.

Agent Stack Directory is listed with 1 API on the APIs.io network. Tagged areas include Artificial Intelligence, Agents, Directory, Tools, and Infrastructure.

Agent Stack Directory’s developer surface includes documentation, pricing, and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

9.8/100 minimal ▬ flat Agent 6/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessOpen

1 API 1 MCP Servers

Artificial Intelligence Agents Directory Tools Infrastructure

Kin Score

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

Composite quality — 9.8/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.8 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 6/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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 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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

11 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
Developer Ergonomics scores 4.8 — up to +19.0 composite points
Access Clarity scores 10.5 — up to +17.9 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/agentstackdirectory-com/apis.yml: open an issue on github.com/api-evangelist/agentstackdirectory-com 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.

Agent Stack Directory MCP Server

Remote Model Context Protocol server at https://agentstackdirectory.com/mcp (Streamable HTTP, POST only, protocol version 2025-06-18). The server card indicates no authenticatio...

MCP Servers 1

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

Agent Stack Directory MCP Server

Agent Stack Directory operates a remote Model Context Protocol (MCP) server at https://agentstackdirectory.com/mcp — a Streamable HTTP endpoint (POST only) speaking MCP protocol...

MCP SERVER

Agent Stack Directory API pricing

Pricing Plans 1

Published pricing tiers and plan structures.

Agentstackdirectory Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Agentstackdirectory Com Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Agentstackdirectory Com Authentication

0 schemes

SECURITY

Agentstackdirectory Com Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Agentstackdirectory Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

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: agentstackdirectory-com
name: Agent Stack Directory
description: Agent Stack Directory is a curated directory of 84 AI agent tools and infrastructure, including cloud browsers,
  code sandboxes, memory, search APIs, email, payments, voice, and observability. It helps developers discover and compare
  services for building AI agents, providing up-to-date listings and pricing information.
url: https://artifacts.apis.io/agentstackdirectory-com/apis.yml
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://agentstackdirectory.com/og/home-84-13.jpg
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
- Agents
- Directory
- Tools
- Infrastructure
tags_raw:
- AI
- Agents
- Directory
- Tools
- Infrastructure
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: LLMsTxt
  url: llms/agentstackdirectory-com-llms.txt
- type: WellKnown
  url: well-known/agentstackdirectory-com-well-known.yml
- type: Hosts
  url: hosts/agentstackdirectory-com-hosts.yml
- type: Vendors
  url: vendors/agentstackdirectory-com-vendors.yml
- type: Documentation
  url: https://agentstackdirectory.com/guides/
- type: DomainSecurity
  url: security/agentstackdirectory-com-domain-security.yml
- type: Website
  url: https://agentstackdirectory.com/
- type: Pricing
  url: https://agentstackdirectory.com/pricing/
- type: PrivacyPolicy
  url: https://agentstackdirectory.com/privacy/
apis:
- aid: agentstackdirectory-com:agentstackdirectory-mcp-server
  name: Agent Stack Directory MCP Server
  description: Remote Model Context Protocol server at https://agentstackdirectory.com/mcp (Streamable HTTP, POST only, protocol
    version 2025-06-18). The server card indicates no authentication required and lists a tools capability; attempts to call
    initialize and tools/list returned HTTP 406, so tool details are unavailable.
  humanURL: https://agentstackdirectory.com/mcp/
  baseURL: https://agentstackdirectory.com/mcp
  tags:
  - MCP
  properties:
  - type: MCPServer
    url: mcp/agentstackdirectory-com-mcp.yml
  - type: MCPServer
    name: Agent Stack Directory MCP endpoint (Streamable HTTP)
    url: https://agentstackdirectory.com/mcp
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Agent Stack Directory API — frequently asked questions

Does Agent Stack Directory have an API?

Yes. APIs.io lists 1 API from Agent Stack Directory, including Agent Stack Directory MCP Server.

How do I authenticate with the Agent Stack Directory API?

Agent Stack Directory documents its authentication (0 schemes). The details are profiled on APIs.io as Agentstackdirectory Com Authentication.

Does Agent Stack Directory have an MCP server?

Yes. APIs.io lists 1 MCP server for Agent Stack Directory: Agent Stack Directory operates a remote Model Context Protocol (MCP) server at https://agentstackdirectory.com/mcp — a Streamable HTTP endpoint (POST only) speaking MCP protocol version 2025-06-18. Th

Is the Agent Stack Directory API ready for AI agents?

Agent Stack Directory has a Kin Score of 9.8 out of 100 (minimal) and an Agent Readiness score of 6.0 (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.

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