Hjarni

Hjarni provides a long‑term memory platform for AI assistants like ChatGPT and Claude. It offers a Markdown knowledge base where users can store notes, organize them with tags and containers, and export or import data. The service includes an official MCP server, API reference, and integrations with popular tools, enabling persistent context for conversational AI.

Hjarni publishes 7 API contracts indexed on the APIs.io network, including Containers API, Dashboard API, Files API, and 4 more. Tagged areas include Company, Artificial Intelligence, Memory, Knowledge Base, and Integration.

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

Hjarni’s developer surface includes authentication, support, documentation, changelog, engineering blog, pricing, getting-started guide, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

56.4/100 strong Agent 49/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 3 Agent Skills

Company Artificial Intelligence Memory Knowledge Base Integration

Kin Score

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

Composite quality — 56.4/100 · strong

Contract Quality 14.3 / 21

Developer Ergonomics 10.0 / 17

Access Clarity 10.8 / 17

Operational Transparency 2.6 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.9 / 15

Agent readiness — 49/100 · 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 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 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 →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 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 →
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's 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):

Operational Transparency scores 23.8 — up to +9.9 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →
Developer Ergonomics scores 58.9 — up to +8.2 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/hjarni-com/apis.yml: open an issue on github.com/api-evangelist/hjarni-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.

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 7

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

Hjarni Containers API

Folders (containers) that hold notes and other folders, and their AI instructions.

Hjarni Dashboard API

Counts and recent notes, in one call.

Hjarni Files API

Attaching files to notes.

Hjarni Me API

The account and the token making the request.

Hjarni Notes API

Markdown notes, their links, revision history and Trash.

Hjarni Search API

Full-text search over notes.

Hjarni Tags API

Tags that label notes across folders.

Scroll for all 7

Agent Skills 3

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

hjarni-com-create-and-retrieve-note

AGENT SKILL

hjarni-com-create-container

AGENT SKILL

hjarni-com-create-tag

AGENT SKILL

Hjarni API pricing

Prices published by Hjarni, read 2026-11-11 from hjarni.com/pricing.

Plan	Price
Free	$0
Pro	$12/month
Teams	$20/seat/month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Hjarni Plans Pricing

3 plans

PLANS

Semantic Vocabularies 1

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

Hjarni Com Context

29 classes · 113 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.

Hjarni API Rules

66 rules · 57 error-severity 7 warn-severity 2 info-severity

SPECTRAL

JSON Schema 6

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

Container

15 properties

JSON SCHEMA

Dashboard

6 properties

JSON SCHEMA

Me

6 properties

JSON SCHEMA

NoteSummary

19 properties

JSON SCHEMA

Revision

11 properties

JSON SCHEMA

TrashedNote

22 properties

JSON SCHEMA

Security Posture 4

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

Hjarni Authentication

1 scheme

SECURITY

Hjarni Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Hjarni Vulnerability Disclosure

no policy recorded

SECURITY

Hjarni Trust Center

SOC 2, ISO 27001, PCI DSS, GDPR

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Hjarni Agentic Access

46 operations · 28 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 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conventions

ErrorCatalog

Conformance

Scroll for all 7

Access & Security 6

Authentication, authorization, and security posture

Compliance

Authentication

Security

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: hjarni-com
name: Hjarni
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://hjarni.com/og/og-home.png?v=46bb97ac
description: Hjarni provides a long‑term memory platform for AI assistants like ChatGPT and Claude. It offers a Markdown knowledge
  base where users can store notes, organize them with tags and containers, and export or import data. The service includes
  an official MCP server, API reference, and integrations with popular tools, enabling persistent context for conversational
  AI.
url: https://artifacts.apis.io/hjarni-com/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:
- Company
- Artificial Intelligence
- Memory
- Knowledge Base
- Integration
tags_raw:
- Company
- AI
- Memory
- KnowledgeBase
- Integration
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/hjarni-com-agentic-access.yml
- type: Plans
  url: plans/hjarni-com-plans-pricing.yml
- type: Spectral
  url: rules/hjarni-com-rules.yml
- type: JSONLD
  url: json-ld/hjarni-com-context.jsonld
- type: Vocabulary
  url: vocabulary/hjarni-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/hjarni-com-data-model.yml
- type: Conventions
  url: conventions/hjarni-com-conventions.yml
- type: Compliance
  url: https://hjarni.com/security
- type: Authentication
  url: authentication/hjarni-com-authentication.yml
- type: ErrorCatalog
  url: errors/hjarni-com-problem-types.yml
- type: Conformance
  url: conformance/hjarni-com-conformance.yml
- type: LLMsTxt
  url: llms/hjarni-com-llms.txt
- type: WellKnown
  url: well-known/hjarni-com-well-known.yml
- type: Hosts
  url: hosts/hjarni-com-hosts.yml
- type: Vendors
  url: vendors/hjarni-com-vendors.yml
- type: TermsOfService
  url: https://hjarni.com/terms
- type: Support
  url: https://hjarni.com/use-cases/support
- type: Security
  url: https://hjarni.com/security
- type: PrivacyPolicy
  url: https://hjarni.com/privacy
- type: Documentation
  url: https://hjarni.com/docs
- type: DeveloperPortal
  url: https://hjarni.com/use-cases/developers
- type: ChangeLog
  url: https://hjarni.com/changelog
- type: Blog
  url: https://hjarni.com/blog
- type: Pricing
  url: https://hjarni.com/pricing
- type: GettingStarted
  url: https://hjarni.com/docs/getting-started
- type: APIReference
  url: https://hjarni.com/llms.txt
- type: TrustCenter
  url: security/hjarni-com-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/hjarni-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/hjarni-com-domain-security.yml
- type: Website
  url: https://hjarni.com/
apis:
- aid: hjarni-com:hjarni-com-containers-api
  name: Hjarni Containers API
  description: Folders (containers) that hold notes and other folders, and their AI instructions.
  humanURL: https://hjarni.com/docs/api
  baseURL: https://hjarni.com/api/v1
  tags:
  - Containers
  properties:
  - type: OpenAPI
    url: openapi/hjarni-com-containers-api-openapi.yml
  - type: JSONSchema
    url: json-schema/hjarni-com-note-summary-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-container-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-revision-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-me-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-dashboard-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-trashed-note-schema.json
- aid: hjarni-com:hjarni-com-dashboard-api
  name: Hjarni Dashboard API
  description: Counts and recent notes, in one call.
  humanURL: https://hjarni.com/docs/api
  baseURL: https://hjarni.com/api/v1
  tags:
  - Dashboards
  tags_raw:
  - Dashboard
  properties:
  - type: OpenAPI
    url: openapi/hjarni-com-dashboard-api-openapi.yml
  - type: JSONSchema
    url: json-schema/hjarni-com-note-summary-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-container-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-revision-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-me-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-dashboard-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-trashed-note-schema.json
- aid: hjarni-com:hjarni-com-files-api
  name: Hjarni Files API
  description: Attaching files to notes.
  humanURL: https://hjarni.com/docs/api
  baseURL: https://hjarni.com/api/v1
  tags:
  - File
  tags_raw:
  - Files
  properties:
  - type: OpenAPI
    url: openapi/hjarni-com-files-api-openapi.yml
  - type: JSONSchema
    url: json-schema/hjarni-com-note-summary-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-container-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-revision-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-me-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-dashboard-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-trashed-note-schema.json
- aid: hjarni-com:hjarni-com-me-api
  name: Hjarni Me API
  description: The account and the token making the request.
  humanURL: https://hjarni.com/docs/api
  baseURL: https://hjarni.com/api/v1
  tags:
  - Me
  properties:
  - type: OpenAPI
    url: openapi/hjarni-com-me-api-openapi.yml
  - type: JSONSchema
    url: json-schema/hjarni-com-note-summary-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-container-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-revision-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-me-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-dashboard-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-trashed-note-schema.json
- aid: hjarni-com:hjarni-com-notes-api
  name: Hjarni Notes API
  description: Markdown notes, their links, revision history and Trash.
  humanURL: https://hjarni.com/docs/api
  baseURL: https://hjarni.com/api/v1
  tags:
  - Notes
  properties:
  - type: OpenAPI
    url: openapi/hjarni-com-notes-api-openapi.yml
  - type: JSONSchema
    url: json-schema/hjarni-com-note-summary-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-container-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-revision-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-me-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-dashboard-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-trashed-note-schema.json
- aid: hjarni-com:hjarni-com-search-api
  name: Hjarni Search API
  description: Full-text search over notes.
  humanURL: https://hjarni.com/docs/api
  baseURL: https://hjarni.com/api/v1
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/hjarni-com-search-api-openapi.yml
  - type: JSONSchema
    url: json-schema/hjarni-com-note-summary-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-container-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-revision-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-me-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-dashboard-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-trashed-note-schema.json
- aid: hjarni-com:hjarni-com-tags-api
  name: Hjarni Tags API
  description: Tags that label notes across folders.
  humanURL: https://hjarni.com/docs/api
  baseURL: https://hjarni.com/api/v1
  tags:
  - Tags
  properties:
  - type: OpenAPI
    url: openapi/hjarni-com-tags-api-openapi.yml
  - type: JSONSchema
    url: json-schema/hjarni-com-note-summary-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-container-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-revision-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-me-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-dashboard-schema.json
  - type: JSONSchema
    url: json-schema/hjarni-com-trashed-note-schema.json
x-enrichment:
  date: '2026-11-11'
  status: enriched
  artifacts_added: 30
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Hjarni API — frequently asked questions

Does Hjarni have an API?

Yes. APIs.io lists 7 APIs from Hjarni, including Hjarni Containers API, Hjarni Dashboard API and Hjarni Files API, and 4 more.

Is there an OpenAPI specification for the Hjarni API?

Yes. APIs.io indexes 7 OpenAPI specifications for Hjarni, each linked for download from this page.

How do I authenticate with the Hjarni API?

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

How much does the Hjarni API cost?

Hjarni publishes its prices; its Free plan is $0 as of 2026-11-11. APIs.io lists 3 pricing plans for Hjarni, with each plan's price, limits and inclusions under Pricing on this page.

Is the Hjarni API ready for AI agents?

Hjarni has a Kin Score of 56.4 out of 100 (strong) and an Agent Readiness score of 48.8 (agent-ready), scored by API Evangelist on 2026-11-13.

Work with this as data

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