stackgems-com

Stack Gems is an agent‑operated catalog of developer tools, offering human‑vetted, opinionated reviews of 955 tools and 527 skills across 13 stacks. It provides a JSON API, MCP server, OpenAPI spec, and llms.txt for machine consumption, designed for LLMs, agents, and automated tools.

stackgems-com is listed with 1 API on the APIs.io network. Tagged areas include Company, Developer Tools, Catalog, Agent-Operated, and OpenAPI.

The stackgems-com catalog on APIs.io includes 1 Spectral governance ruleset.

stackgems-com’s developer surface includes sandbox, documentation, API reference, getting-started guide, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.4/100 emerging Agent 19/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API 1 MCP Servers 2 Agent Skills

Company Developer Tools CatalogAgent-OperatedOpenAPI

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 25.4/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 8.4 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.2 / 11

Contract Governance 5.8 / 10

Discoverability 5.5 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 19/100 · 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 7 / 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

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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
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)

7 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 0.0 — up to +20.0 composite points
Operational Transparency scores 10.5 — up to +11.6 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/stackgems-com/apis.yml: open an issue on github.com/api-evangelist/stackgems-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 →

APIs 1

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

Stack Gems Catalog API

Public read-only JSON catalog. No registration or credentials.

MCP Servers 1

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

stackgems-com MCP Server

Remote MCP server at stackgems.com.

MCP SERVER

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

get-gem

AGENT SKILL

list-gems

AGENT SKILL

Rate Limits 1

Documented rate limits and quota policies.

Stackgems Com Rate Limits

0 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

stackgems-com API Rules

10 rules · 9 errors 1 info

SPECTRAL

Security Posture 2

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

Stackgems Com Authentication

0 schemes

SECURITY

Stackgems Com Domain Security

TLSv1.3

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Stackgems Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Stackgems Com Agentic Access

8 operations · 1 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Sandbox

Sandbox

GettingStarted

GettingStarted

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 4

Pagination, idempotency, versioning, errors, and events

Spectral

Conventions

ErrorCatalog

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: stackgems-com
name: stackgems-com
description: Stack Gems is an agent‑operated catalog of developer tools, offering human‑vetted, opinionated reviews of 955
  tools and 527 skills across 13 stacks. It provides a JSON API, MCP server, OpenAPI spec, and llms.txt for machine consumption,
  designed for LLMs, agents, and automated tools.
url: https://artifacts.apis.io/stackgems-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Company
- Developer Tools
- Catalog
- Agent-Operated
- OpenAPI
image: https://stackgems.com/favicon.ico
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/stackgems-com-agentic-access.yml
- type: Spectral
  url: rules/stackgems-com-rules.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Conventions
  url: conventions/stackgems-com-conventions.yml
- type: ErrorCatalog
  url: errors/stackgems-com-problem-types.yml
- type: Conformance
  url: conformance/stackgems-com-conformance.yml
- type: LLMsTxt
  url: llms/stackgems-com-llms.txt
- type: ToolCrosswalk
  url: mcp/stackgems-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/stackgems-com-mcp.yml
- type: WellKnown
  url: well-known/stackgems-com-well-known.yml
- type: Hosts
  url: hosts/stackgems-com-hosts.yml
- type: Security
  url: https://stackgems.com/tag/security
- type: Sandbox
  url: https://stackgems.com/tag/sandbox
- type: SDKs
  url: https://stackgems.com/stacks/libraries
- type: DomainSecurity
  url: security/stackgems-com-domain-security.yml
- type: Website
  url: https://stackgems.com/
- type: Documentation
  url: https://stackgems.com/for-agents.md
- type: APIReference
  url: https://stackgems.com/openapi.json
- type: GettingStarted
  url: https://stackgems.com/about
apis:
- name: Stack Gems Catalog API
  description: Public read-only JSON catalog. No registration or credentials.
  humanURL: https://stackgems.com/for-agents.md
  baseURL: https://stackgems.com
  aid: stackgems-com:stack-gems-catalog-api
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 28
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

stackgems-com API — frequently asked questions

Does stackgems-com have an API?

Yes. APIs.io lists 1 API from stackgems-com, including Stack Gems Catalog API.

How do I authenticate with the stackgems-com API?

stackgems-com documents its authentication (0 schemes). The details are profiled on APIs.io as Stackgems Com Authentication.

Does stackgems-com have an MCP server?

Yes. APIs.io lists 1 MCP server for stackgems-com: Remote MCP server at stackgems.com.

Is the stackgems-com API ready for AI agents?

stackgems-com has a Kin Score of 25.4 out of 100 (emerging) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-10-31.

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