Tonk

Tonk, built by Tonk Labs, is an open-source containerized format, host environment, and protocol for multiplayer, local-first software you keep and share like files. A .tonk bundle packages an application together with its data into a single self-contained file that runs anywhere, works offline, and stays under user control. It is built on a document-based virtual file system using Automerge CRDTs, a browser/WebAssembly runtime compiled from Rust, and peer-to-peer synchronization through WebSocket relays. Tonk ships first-party npm client libraries, a CLI, a sync relay, an authentication library, and an MCP worker rather than a hosted REST API. Backed by Electric Capital.

Tonk is profiled on the APIs.io network. Tagged areas include Company, Developer Tools, Local-First, CRDT, and Collaboration.

Tonk’s developer surface includes engineering blog, documentation, getting-started guide, support, CLI, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

14.0/100 emerging ▬ flat Agent 4/100 human only Front door AI 1/6 silent Heartbeat 100/100 alive library Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs 1 MCP Servers

Company Developer Tools Local-First CRDT Collaboration Open Source Data Sync WebAssembly

Kin Score

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

Composite quality — 14.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 8.1 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 4.7 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 4/100 · human only

Machine-Readable Contract 0 / 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 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

12 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Operational Transparency scores 2.6 — up to +12.7 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/tonk/apis.yml: open an issue on github.com/api-evangelist/tonk 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 1

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Tonk MCP Server

First-party Model Context Protocol (MCP) worker service published by Tonk Labs under the @tonk npm scope. It provides MCP support for the Tonk + Obsidian integration (exposing T...

MCP SERVER

Security Posture 1

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

Tonk Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 3

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

Website

Website

Source (apis.yml)

aid: tonk
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
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://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/tonk.png
name: Tonk
description: Tonk, built by Tonk Labs, is an open-source containerized format, host environment, and protocol for multiplayer,
  local-first software you keep and share like files. A .tonk bundle packages an application together with its data into a
  single self-contained file that runs anywhere, works offline, and stays under user control. It is built on a document-based
  virtual file system using Automerge CRDTs, a browser/WebAssembly runtime compiled from Rust, and peer-to-peer synchronization
  through WebSocket relays. Tonk ships first-party npm client libraries, a CLI, a sync relay, an authentication library, and
  an MCP worker rather than a hosted REST API. Backed by Electric Capital.
url: https://raw.githubusercontent.com/api-evangelist/tonk/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- electric-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Developer Tools
- Local-First
- CRDT
- Collaboration
- Open Source
- Data Sync
- WebAssembly
tags_raw:
- Company
- Developer Tools
- Local-First
- CRDT
- Collaboration
- Open Source
- Data Sync
- WebAssembly
- Open-Source
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://tonk.xyz/updates
  type: Blog
- url: https://tonk.xyz/rss.xml
  type: BlogRSS
- type: Website
  url: https://tonk.xyz/
- type: DeveloperPortal
  url: https://tonk.xyz/
- type: Documentation
  url: https://tonk-labs.github.io/tonk
- type: GettingStarted
  url: https://tonk-labs.github.io/tonk/quickstart.html
- type: GitHubOrganization
  url: https://github.com/tonk-labs
- type: Support
  url: https://discord.gg/cHqkYpRE
- type: Packages
  url: packages/tonk-packages.yml
- type: SDKs
  url: packages/tonk-packages.yml
- type: CLI
  url: cli/tonk-cli.yml
- type: MCPServer
  url: mcp/tonk-mcp.yml
- type: LLMsTxt
  url: llms/tonk-llms.txt
- type: DomainSecurity
  url: security/tonk-domain-security.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 6
  pass: local-v1

Tonk API — frequently asked questions

Does Tonk have an MCP server?

Yes. APIs.io lists 1 MCP server for Tonk: First-party Model Context Protocol (MCP) worker service published by Tonk Labs under the @tonk npm scope. It provides MCP support for the Tonk + Obsidian integration (exposing Tonk-managed knowledge/d

Is the Tonk API ready for AI agents?

Tonk has a Kin Score of 14.0 out of 100 (emerging) and an Agent Readiness score of 3.5 (human-only), 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.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

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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