Capability Host Protocol

Govern what your AI agents can actually do — every capability declared, every invocation allowed or denied, every result captured as replayable, tamper-evident evidence in one command. CHP is the open protocol for declaring, discovering, invoking, governing, and proving what agents, products, and organizations can do.

Capability Host Protocol publishes 2 API contracts indexed on the APIs.io network, including — Public API API, and 1 more. Tagged areas include Artificial Intelligence, Governance, Protocol, Capabilities, and Agents.

The Capability Host Protocol catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Capability Host Protocol’s developer surface includes CLI, sandbox, getting-started guide, documentation, API reference, engineering blog, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.1/100 thin Agent 36/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract

Artificial Intelligence Governance Protocol Capabilities Agents

Kin Score

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

Composite quality — 27.1/100 · thin

Contract Quality 8.9 / 21

Developer Ergonomics 6.5 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.4 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 1.5 / 15

Agent readiness — 36/100 · agent ready

Machine-Readable Contract 18 / 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 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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 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):

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)
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

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 0.0 — up to +20.0 composite points
Contract Quality scores 42.0 — up to +14.5 composite points
Operational Transparency scores 3.9 — up to +12.5 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/capabilityhostprotocol-com/apis.yml: open an issue on github.com/api-evangelist/capabilityhostprotocol-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 3

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 (conformant)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Capability Host Protocol API

Public API for querying capabilities, discovering agents and managing governance.

Capability Host Protocol — Public API API

CHP is the governed execution layer of the agentic web. This API exposes a natural-language query endpoint (/ask), the well-known discovery manifests, and the MCP server endpoin...

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Capabilityhostprotocol Com Context

2 classes · 5 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Capability Host Protocol API Rules

44 rules · 42 errors 1 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

AskResponse

4 properties

JSON SCHEMA

Security Posture 1

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

Capabilityhostprotocol Com Domain Security

TLSv1.3 · HSTS · DNSSEC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Sandbox

Sandbox

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Conformance

DataModel

ErrorCatalog

Webhooks

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

CLI

CLI

SDKs

SDKs

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 4

Properties that don't map to a standard resource type

AgentCard

Hosts

Vendors

Image

Source (apis.yml)

aid: capabilityhostprotocol-com
name: Capability Host Protocol
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://capabilityhostprotocol.com/opengraph-image?fbbeb843739d50f9
description: Govern what your AI agents can actually do — every capability declared, every invocation allowed or denied, every
  result captured as replayable, tamper-evident evidence in one command. CHP is the open protocol for declaring, discovering,
  invoking, governing, and proving what agents, products, and organizations can do.
url: https://artifacts.apis.io/capabilityhostprotocol-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-04 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-04'
modified: '2026-11-04'
tags:
- Artificial Intelligence
- Governance
- Protocol
- Capabilities
- Agents
tags_raw:
- AI
- Governance
- Protocol
- Capability
- Agents
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/capabilityhostprotocol-com-rules.yml
- type: JSONLD
  url: json-ld/capabilityhostprotocol-com-context.jsonld
- type: Vocabulary
  url: vocabulary/capabilityhostprotocol-com-vocabulary.yml
- type: Conformance
  url: conformance/capabilityhostprotocol-com-conformance.yml
- type: DataModel
  url: data-model/capabilityhostprotocol-com-data-model.yml
- type: CLI
  url: cli/capabilityhostprotocol-com-cli.yml
- type: ErrorCatalog
  url: errors/capabilityhostprotocol-com-problem-types.yml
- type: LLMsTxt
  url: llms/capabilityhostprotocol-com-llms.txt
- type: AgentCard
  url: a2a/capabilityhostprotocol-com-a2a.yml
- type: WellKnown
  url: well-known/capabilityhostprotocol-com-well-known.yml
- type: Hosts
  url: hosts/capabilityhostprotocol-com-hosts.yml
- type: Vendors
  url: vendors/capabilityhostprotocol-com-vendors.yml
- type: SDKs
  url: packages/capabilityhostprotocol-com-packages.yml
- type: Packages
  url: packages/capabilityhostprotocol-com-packages.yml
- type: Webhooks
  url: https://capabilityhostprotocol.com/adapters/webhook
- type: Sandbox
  url: https://capabilityhostprotocol.com/adapters/sandbox
- type: DeveloperPortal
  url: https://www.capabilityhostprotocol.com/developers
- type: GettingStarted
  url: https://docs.capabilityhostprotocol.com/docs/quickstart-agents
- type: DomainSecurity
  url: security/capabilityhostprotocol-com-domain-security.yml
- type: Website
  url: https://capabilityhostprotocol.com/
- type: Documentation
  url: https://docs.capabilityhostprotocol.com/
- type: APIReference
  url: https://www.capabilityhostprotocol.com/openapi.json
- type: Blog
  url: https://www.capabilityhostprotocol.com/blog
- type: Image
  url: https://capabilityhostprotocol.com/opengraph-image?fbbeb843739d50f9
apis:
- name: Capability Host Protocol API
  description: Public API for querying capabilities, discovering agents and managing governance.
  humanURL: https://www.capabilityhostprotocol.com/developers
  baseURL: https://www.capabilityhostprotocol.com
  aid: capabilityhostprotocol-com:capability-host-protocol-api
- aid: capabilityhostprotocol-com:capability-host-protocol-public-api-api
  name: Capability Host Protocol — Public API API
  description: 'CHP is the governed execution layer of the agentic web. This API exposes a natural-language query endpoint
    (/ask), the well-known

    discovery manifests, and the MCP server endpoint. For full tool invocation, connect over MCP at /api/mcp.'
  humanURL: https://capabilityhostprotocol.com/openapi.json
  baseURL: https://capabilityhostprotocol.com
  properties:
  - type: OpenAPI
    url: openapi/_original/capabilityhostprotocol-com-api-openapi.json
  - type: JSONSchema
    url: json-schema/capabilityhostprotocol-com-ask-response-schema.json
x-enrichment:
  date: '2026-11-04'
  status: enriched
  artifacts_added: 22
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Capability Host Protocol API — frequently asked questions

Does Capability Host Protocol have an API?

Yes. APIs.io lists 2 APIs from Capability Host Protocol, including Capability Host Protocol API and Capability Host Protocol — Public API API.

Is there an OpenAPI specification for the Capability Host Protocol API?

Yes. APIs.io indexes 1 OpenAPI specification for Capability Host Protocol, each linked for download from this page.

Is the Capability Host Protocol API ready for AI agents?

Capability Host Protocol has a Kin Score of 27.1 out of 100 (thin) and an Agent Readiness score of 35.7 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

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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.
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apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
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find_cohortsEvery scored population of providers in the catalog.

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