Honcho

Honcho is an open-source AI memory platform for agents, enabling persistent state across sessions and tools. It supports integration with Claude Code, offers free credits and pay‑per‑million‑token ingestion, and provides a developer‑friendly API for long‑term memory storage, retrieval, and management. The project is maintained by Plastic Labs and aims to be the go‑to memory layer for autonomous AI agents.

Honcho publishes 8 API contracts indexed on the APIs.io network, including Apps API, Collections API, Documents API, and 5 more. Tagged areas include Artificial Intelligence, Memory, Open Source, Agents, and Platform.

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

Honcho’s developer surface includes CLI, changelog, authentication, engineering blog, documentation, API reference, getting-started guide, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

44.4/100 developing Agent 50/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 published contract 4 Agent Skills

Artificial Intelligence Memory Open Source Agents Platform

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 44.4/100 · developing

Contract Quality 13.8 / 21

Developer Ergonomics 10.4 / 17

Access Clarity 2.9 / 17

Operational Transparency 1.6 / 11

Contract Governance 2.2 / 10

Discoverability 6.5 / 9

Regulatory Posture 2.6 / 15

Agent readiness — 50/100 · agent ready

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 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
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) Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →

3 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 17.0 — up to +16.6 composite points Ask about this →
Operational Transparency scores 14.3 — up to +11.1 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/honcho-dev/apis.yml: open an issue on github.com/api-evangelist/honcho-dev 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 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 (conformant)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 8

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

Honcho Apps API

The apps API from Honcho — 5 operation(s) for apps.

Honcho Collections API

The collections API from Honcho — 4 operation(s) for collections.

Honcho Documents API

The documents API from Honcho — 4 operation(s) for documents.

Honcho Keys API

The keys API from Honcho — 1 operation(s) for keys.

Honcho Messages API

The messages API from Honcho — 4 operation(s) for messages.

Honcho Metamessages API

The metamessages API from Honcho — 3 operation(s) for metamessages.

Honcho Sessions API

The sessions API from Honcho — 5 operation(s) for sessions.

Honcho Users API

The users API from Honcho — 5 operation(s) for users.

Scroll for all 8

Agent Skills 4

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

honcho-dev-create-and-chat-session

AGENT SKILL

honcho-dev-manage-documents

AGENT SKILL

honcho-dev-metamessage-workflow

AGENT SKILL

honcho-dev-send-message

AGENT SKILL

Semantic Vocabularies 1

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

Honcho Dev Context

41 classes · 29 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Honcho API Rules

58 rules · 52 error-severity 5 warn-severity 1 info-severity

SPECTRAL

JSON Schema 6

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

Collection

6 properties

JSON SCHEMA

Document

7 properties

JSON SCHEMA

Message

8 properties

JSON SCHEMA

MetamessageCreate

5 properties

JSON SCHEMA

Metamessage

10 properties

JSON SCHEMA

Session

6 properties

JSON SCHEMA

Security Posture 2

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

Honcho Authentication

1 scheme

SECURITY

Honcho Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Honcho Agentic Access

41 operations · 22 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

CLI

CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: honcho-dev
name: Honcho
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://honcho.dev/opengraph-image.png?bdb2d68407bc6230
description: Honcho is an open-source AI memory platform for agents, enabling persistent state across sessions and tools.
  It supports integration with Claude Code, offers free credits and pay‑per‑million‑token ingestion, and provides a developer‑friendly
  API for long‑term memory storage, retrieval, and management. The project is maintained by Plastic Labs and aims to be the
  go‑to memory layer for autonomous AI agents.
url: https://artifacts.apis.io/honcho-dev/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-11 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-11'
modified: '2026-11-11'
tags:
- Artificial Intelligence
- Memory
- Open Source
- Agents
- Platform
tags_raw:
- AI
- Memory
- OpenSource
- Agents
- Platform
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/honcho-dev-agentic-access.yml
- type: Spectral
  url: rules/honcho-dev-rules.yml
- type: JSONLD
  url: json-ld/honcho-dev-context.jsonld
- type: Vocabulary
  url: vocabulary/honcho-dev-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/honcho-dev-data-model.yml
- type: CLI
  url: cli/honcho-dev-cli.yml
- type: ChangeLog
  url: changelog/honcho-dev-changelog.yml
- type: Authentication
  url: authentication/honcho-dev-authentication.yml
- type: ErrorCatalog
  url: errors/honcho-dev-problem-types.yml
- type: Conformance
  url: conformance/honcho-dev-conformance.yml
- type: LLMsTxt
  url: llms/honcho-dev-llms.txt
- type: AgentCard
  url: a2a/honcho-dev-a2a.yml
- type: WellKnown
  url: well-known/honcho-dev-well-known.yml
- type: Hosts
  url: hosts/honcho-dev-hosts.yml
- type: Vendors
  url: vendors/honcho-dev-vendors.yml
- type: TermsOfService
  url: https://app.honcho.dev/tos
- type: PrivacyPolicy
  url: https://app.honcho.dev/privacy
- type: ChangeLog
  url: https://honcho.dev/docs/changelog/introduction
- type: Blog
  url: https://honcho.dev/blog/
- type: DomainSecurity
  url: security/honcho-dev-domain-security.yml
- type: Website
  url: https://honcho.dev/
- type: DeveloperPortal
  url: https://honcho.dev/docs
- type: Documentation
  url: https://honcho.dev/docs
- type: APIReference
  url: https://honcho.dev/docs/v3/openapi.json
- type: GettingStarted
  url: https://honcho.dev/docs/v3/documentation/introduction/quickstart.md
apis:
- aid: honcho-dev:honcho-dev-apps-api
  name: Honcho Apps API
  description: The apps API from Honcho — 5 operation(s) for apps.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - Application
  tags_raw:
  - apps
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-apps-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
- aid: honcho-dev:honcho-dev-collections-api
  name: Honcho Collections API
  description: The collections API from Honcho — 4 operation(s) for collections.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - Collection
  tags_raw:
  - collections
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-collections-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
- aid: honcho-dev:honcho-dev-documents-api
  name: Honcho Documents API
  description: The documents API from Honcho — 4 operation(s) for documents.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - Documents
  tags_raw:
  - documents
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-documents-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
- aid: honcho-dev:honcho-dev-keys-api
  name: Honcho Keys API
  description: The keys API from Honcho — 1 operation(s) for keys.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - Keys
  tags_raw:
  - keys
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-keys-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
- aid: honcho-dev:honcho-dev-messages-api
  name: Honcho Messages API
  description: The messages API from Honcho — 4 operation(s) for messages.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - Message
  tags_raw:
  - messages
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-messages-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
- aid: honcho-dev:honcho-dev-metamessages-api
  name: Honcho Metamessages API
  description: The metamessages API from Honcho — 3 operation(s) for metamessages.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - metamessages
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-metamessages-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
- aid: honcho-dev:honcho-dev-sessions-api
  name: Honcho Sessions API
  description: The sessions API from Honcho — 5 operation(s) for sessions.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - Sessions
  tags_raw:
  - sessions
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-sessions-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
- aid: honcho-dev:honcho-dev-users-api
  name: Honcho Users API
  description: The users API from Honcho — 5 operation(s) for users.
  humanURL: https://honcho.dev/docs/v3/api-reference/introduction
  baseURL: https://demo.honcho.dev
  tags:
  - User
  tags_raw:
  - users
  properties:
  - type: OpenAPI
    url: openapi/honcho-dev-users-api-openapi.yml
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-message-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-metamessage-create-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-document-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-session-schema.json
  - type: JSONSchema
    url: json-schema/honcho-dev-collection-schema.json
x-enrichment:
  date: '2026-11-11'
  status: enriched
  artifacts_added: 32
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Honcho API — frequently asked questions

Does Honcho have an API?

Yes. APIs.io lists 8 APIs from Honcho, including Honcho Apps API, Honcho Collections API and Honcho Documents API, and 5 more.

Is there an OpenAPI specification for the Honcho API?

Yes. APIs.io indexes 8 OpenAPI specifications for Honcho, each linked for download from this page.

How do I authenticate with the Honcho API?

Honcho documents its authentication (1 scheme). The details are profiled on APIs.io as Honcho Authentication.

Is the Honcho API ready for AI agents?

Honcho has a Kin Score of 44.4 out of 100 (developing) and an Agent Readiness score of 49.8 (agent-ready), scored by API Evangelist on 2026-11-13.

Work with this as data

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