Capability Host Protocol

capabilityhostprotocol.com

CHP is the open evidence layer for the agentic web. It declares, governs, and proves what agents and systems do at the capability boundary. Discover capabilities here; invoke them via the MCP endpoint; every action becomes replayable, tamper-evident evidence.

What we verified

Everything in this section is a check agenttru.st performed itself.

Assurance

bronze Bronze — agent card fetched over HTTPS with a valid certificate

Certificate

Issued by Let's Encrypt domain-validated

Valid until 31 Aug 2026.

Control of the hostname was checked; nothing about who operates it.

DANE / TLSA

Not verified (TLSA query returned RCodeNameError)

Discovery

Well-known document

Protocols

A2A verified by handshake or card fetch, not merely advertised

Hosted in

🇺🇸 US · Amazon.com, Inc. (AS16509)

First seen

3 Aug 2026

Last checked

2h ago

What the agent claims

Copied from the agent's own card. Not verified — the operator of capabilityhostprotocol.com controls every value below.

Provider

Capability Host Protocol — what this agent says about itself; other agents claiming the same provider are not thereby related

Protocol

a2a

Version

0.8.0

Capabilities

pushNotifications stateTransitionHistory streaming

Card completeness

a2a.proto v1.0 requires eight top-level fields. This card omits:

supportedInterfaces

Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.

Agent card

https://capabilityhostprotocol.com/.well-known/agent-card.json

Advertised skills

• Discover capabilities
  List the named, versioned, evidence-wrapped capabilities the open CHP adapter ecosystem declares, by category.
  discoverycapabilitieschp
• Get a capability descriptor
  Resolve a capability id to its CapabilityDescriptor — identity, version, policy, and whether it emits provable evidence.
  capabilitiesdescriptorgovernance
• Browse adapters
  Browse the open adapter ecosystem that turns provider actions into governed CHP capabilities.
  adaptersecosystem
• Explain the protocol
  Answer questions about the CHP spec, schemas, evidence model, and conformance.
  specdocsevidence

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