Stacklok

Stacklok is a company surfaced as a portfolio company of accel, bain-capital-ventures and added to the API Evangelist network as a stub for enrichment. Sector: open-source. This profile is a lead awaiting the enrichment pipeline.

Stacklok publishes 16 API contracts indexed on the APIs.io network, including Clients API, Discovery API, Groups API, and 13 more. Tagged areas include Company, Open Source, and A2A.

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

Stacklok’s developer surface includes engineering blog and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

17.4/100 emerging ▬ flat Agent 26/100 agent aware Front door AI 6/6 dominant Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 2 Agent Skills

Company Open Source A2A

What this lets a business do 1

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

Software Release & Deployment Management

BC-4210

Secrets

POST /api/v1beta/secrets POST /api/v1beta/secrets/default/keys

Kin Score

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

Composite quality — 17.4/100 · emerging

Contract Quality 8.1 / 19

Developer Ergonomics 0.6 / 15

Access Clarity 0.0 / 15

Operational Transparency 0.0 / 10

Contract Governance 1.6 / 9

Discoverability 3.2 / 8

Regulatory Posture 0.0 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 26/100 · agent aware

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 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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 0 / 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)
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
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)

8 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 4.2 — up to +19.2 composite points
Contract Quality scores 43.4 — up to +14.2 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/stacklok/apis.yml: open an issue on github.com/api-evangelist/stacklok 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Software Supply Chain (SBOM, Signing, Open Source Security)	standard	51.7	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 4

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.

Agent2Agent

measured — observed by APIs.io (flavored)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

OpenID Connect

measured — observed by APIs.io (declared)

APIs 16

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

Stacklok Clients API

The clients API from Stacklok — 5 operation(s) for clients.

Stacklok Discovery API

The discovery API from Stacklok — 1 operation(s) for discovery.

Stacklok Groups API

The groups API from Stacklok — 2 operation(s) for groups.

Stacklok Logs API

The logs API from Stacklok — 2 operation(s) for logs.

Stacklok Registry API

The registry API from Stacklok — 10 operation(s) for registry.

Stacklok Registry Servers API

The registry-servers API from Stacklok — 2 operation(s) for registry-servers.

Stacklok Registry Skills API

The registry-skills API from Stacklok — 2 operation(s) for registry-skills.

Stacklok Secrets API

The secrets API from Stacklok — 4 operation(s) for secrets.

Stacklok Skills API

The skills API from Stacklok — 12 operation(s) for skills.

Stacklok System API

The system API from Stacklok — 3 operation(s) for system.

Stacklok Version API

The version API from Stacklok — 1 operation(s) for version.

Stacklok Workloads API

The workloads API from Stacklok — 13 operation(s) for workloads.

Stacklok Entries API

The Entries API from Stacklok — 3 operation(s) for entries.

Stacklok Me API

The Me API from Stacklok — 1 operation(s) for me.

Stacklok Registries API

The Registries API from Stacklok — 3 operation(s) for registries.

Stacklok Sources API

The Sources API from Stacklok — 3 operation(s) for sources.

Scroll for all 16

Open Collections 13

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

ToolHive Registry clients API

OPEN COLLECTION

ToolHive Registry clients discovery API

OPEN COLLECTION

ToolHive Registry clients groups API

OPEN COLLECTION

ToolHive Registry clients logs API

OPEN COLLECTION

ToolHive clients registry API

OPEN COLLECTION

ToolHive Registry clients registry-servers API

OPEN COLLECTION

ToolHive Registry clients registry-skills API

OPEN COLLECTION

ToolHive Registry clients secrets API

OPEN COLLECTION

ToolHive Registry clients skills API

OPEN COLLECTION

ToolHive Registry clients system API

OPEN COLLECTION

ToolHive Registry clients v1 API

OPEN COLLECTION

ToolHive Registry clients version API

OPEN COLLECTION

ToolHive Registry clients workloads API

OPEN COLLECTION

Scroll for all 13

Agent Skills 2

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

Discover and run an MCP server with ToolHive

AGENT SKILL

Publish and govern an MCP registry entry

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Stacklok API Rules

61 rules · 45 errors 11 warnings 5 info

SPECTRAL

OpenAPI Overlays 2

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Stacklok Registry Overlay

1 action · update · stacklok-registry-api-openapi.yml

DERIVED

Stacklok Toolhive Overlay

1 action · update · stacklok-toolhive-api-openapi.yml

DERIVED

Security Posture 2

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

Stacklok Authentication

oauth2/openIdConnect · 1 scheme

SECURITY

Stacklok Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Stacklok Agentic Access

84 operations · 39 acting · 8 human-in-the-loop

84 operations · 39 acting

AGENTIC

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

X-MCPServerCandidate

X-MCPServerCandidate

Company 3

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

Website

Website

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

AgentCard

AgentCard

Source (apis.yml)

aid: stacklok
name: Stacklok
description: 'Stacklok is a company surfaced as a portfolio company of accel, bain-capital-ventures and added to the API Evangelist
  network as a stub for enrichment. Sector: open-source. This profile is a lead awaiting the enrichment pipeline.'
url: https://raw.githubusercontent.com/api-evangelist/stacklok/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
- bain-capital-ventures
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Open Source
- A2A
tags_raw:
- Company
- Open Source
- Open-Source
- A2A
apis:
- aid: stacklok:stacklok-clients-api
  name: Stacklok Clients API
  description: The clients API from Stacklok — 5 operation(s) for clients.
  tags:
  - Clients
  tags_raw:
  - clients
  properties:
  - type: OpenAPI
    url: openapi/stacklok-clients-api-openapi.yml
- aid: stacklok:stacklok-discovery-api
  name: Stacklok Discovery API
  description: The discovery API from Stacklok — 1 operation(s) for discovery.
  tags:
  - Discovery
  tags_raw:
  - discovery
  properties:
  - type: OpenAPI
    url: openapi/stacklok-discovery-api-openapi.yml
- aid: stacklok:stacklok-groups-api
  name: Stacklok Groups API
  description: The groups API from Stacklok — 2 operation(s) for groups.
  tags:
  - Group
  tags_raw:
  - groups
  properties:
  - type: OpenAPI
    url: openapi/stacklok-groups-api-openapi.yml
- aid: stacklok:stacklok-logs-api
  name: Stacklok Logs API
  description: The logs API from Stacklok — 2 operation(s) for logs.
  tags:
  - Logs
  tags_raw:
  - logs
  properties:
  - type: OpenAPI
    url: openapi/stacklok-logs-api-openapi.yml
- aid: stacklok:stacklok-registry-api
  name: Stacklok Registry API
  description: The registry API from Stacklok — 10 operation(s) for registry.
  tags:
  - Registry
  tags_raw:
  - registry
  properties:
  - type: OpenAPI
    url: openapi/stacklok-registry-api-openapi.yml
- aid: stacklok:stacklok-registry-servers-api
  name: Stacklok Registry Servers API
  description: The registry-servers API from Stacklok — 2 operation(s) for registry-servers.
  tags:
  - registry-servers
  properties:
  - type: OpenAPI
    url: openapi/stacklok-registry-servers-api-openapi.yml
- aid: stacklok:stacklok-registry-skills-api
  name: Stacklok Registry Skills API
  description: The registry-skills API from Stacklok — 2 operation(s) for registry-skills.
  tags:
  - registry-skills
  properties:
  - type: OpenAPI
    url: openapi/stacklok-registry-skills-api-openapi.yml
- aid: stacklok:stacklok-secrets-api
  name: Stacklok Secrets API
  description: The secrets API from Stacklok — 4 operation(s) for secrets.
  tags:
  - Secrets
  tags_raw:
  - secrets
  properties:
  - type: OpenAPI
    url: openapi/stacklok-secrets-api-openapi.yml
- aid: stacklok:stacklok-skills-api
  name: Stacklok Skills API
  description: The skills API from Stacklok — 12 operation(s) for skills.
  tags:
  - Skills
  tags_raw:
  - skills
  properties:
  - type: OpenAPI
    url: openapi/stacklok-skills-api-openapi.yml
- aid: stacklok:stacklok-system-api
  name: Stacklok System API
  description: The system API from Stacklok — 3 operation(s) for system.
  tags:
  - System
  tags_raw:
  - system
  properties:
  - type: OpenAPI
    url: openapi/stacklok-system-api-openapi.yml
- aid: stacklok:stacklok-version-api
  name: Stacklok Version API
  description: The version API from Stacklok — 1 operation(s) for version.
  tags:
  - Version
  tags_raw:
  - version
  properties:
  - type: OpenAPI
    url: openapi/stacklok-version-api-openapi.yml
- aid: stacklok:stacklok-workloads-api
  name: Stacklok Workloads API
  description: The workloads API from Stacklok — 13 operation(s) for workloads.
  tags:
  - Workloads
  tags_raw:
  - workloads
  properties:
  - type: OpenAPI
    url: openapi/stacklok-workloads-api-openapi.yml
- aid: stacklok:stacklok-entries-api
  name: Stacklok Entries API
  description: The Entries API from Stacklok — 3 operation(s) for entries.
  tags:
  - Entries
  properties:
  - type: OpenAPI
    url: openapi/stacklok-entries-api-openapi.yml
- aid: stacklok:stacklok-me-api
  name: Stacklok Me API
  description: The Me API from Stacklok — 1 operation(s) for me.
  tags:
  - Me
  properties:
  - type: OpenAPI
    url: openapi/stacklok-me-api-openapi.yml
- aid: stacklok:stacklok-registries-api
  name: Stacklok Registries API
  description: The Registries API from Stacklok — 3 operation(s) for registries.
  tags:
  - Registries
  properties:
  - type: OpenAPI
    url: openapi/stacklok-registries-api-openapi.yml
- aid: stacklok:stacklok-sources-api
  name: Stacklok Sources API
  description: The Sources API from Stacklok — 3 operation(s) for sources.
  tags:
  - Sources
  properties:
  - type: OpenAPI
    url: openapi/stacklok-sources-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://stacklok.com/blog/
  type: Blog
- url: https://stacklok.com/blog/feed/
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/stacklok-capability-edges.yml
  name: Stacklok Business Capability Map
- type: AgentSkill
  url: skills/stacklok-discover-and-run-mcp-server.md
- type: X-MCPServerCandidate
  url: mcp/stacklok-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Overlay
  url: overlays/stacklok-registry-overlay.yaml
- type: AgentCard
  url: a2a/stacklok-a2a.yml
  name: A2A Agent Card
  description: Agent Card served at /.well-known/agent-card.json (flavored against A2A 1.0.0).
- type: Website
  url: https://www.stacklok.com/

Stacklok API — frequently asked questions

Does Stacklok have an API?

Yes. APIs.io lists 16 APIs from Stacklok, including Stacklok Clients API, Stacklok Discovery API and Stacklok Groups API, and 13 more.

Is there an OpenAPI specification for the Stacklok API?

Yes. APIs.io indexes 16 OpenAPI specifications for Stacklok, each linked for download from this page.

How do I authenticate with the Stacklok API?

Stacklok uses bearer-token authentication (oauth2/openIdConnect · 1 scheme). The details are profiled on APIs.io as Stacklok Authentication.

Is the Stacklok API ready for AI agents?

Stacklok has a Kin Score of 17.4 out of 100 (emerging) and an Agent Readiness score of 26.0 (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.

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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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