Skillsync

Skillsync gives AI coding sessions a permanent home — "GitHub for your agent sessions." Developers install the `skl` CLI, sign in once through the browser, and publish a coding session; they can then revisit past work, share the full context behind a change, and turn workflows that worked into reusable skills. The CLI discovers sessions from Claude Code (full support), Codex and OpenCode (beta), and also pi, Campfire, Cursor, Grok, Amp, and Antigravity, and ships a Model Context Protocol server (`skl mcp`) that gives an assistant a long memory over past and published sessions. Skillsync is a Y Combinator (W2026) company; it exposes no public REST API — the CLI and its bundled MCP server are the integration surface.

Skillsync is profiled on the APIs.io network. Tagged areas include Company, Developer Tools, Artificial Intelligence, Agents, and Coding Assistants.

Skillsync’s developer surface includes documentation, getting-started guide, engineering blog, CLI, authentication, changelog, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.9/100 emerging ▬ flat Agent 6/100 agent aware Front door AI 4/6 moderate Heartbeat 68/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessSelf serve

0 APIs 1 MCP Servers

Company Developer Tools Artificial Intelligence AgentsCoding AssistantsMCP CLI Knowledge Management Y Combinator

Kin Score

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

Composite quality — 22.9/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 8.9 / 17

Access Clarity 2.9 / 17

Operational Transparency 2.0 / 11

Contract Governance 0.5 / 10

Discoverability 4.7 / 9

Regulatory Posture 2.9 / 15

Agent readiness — 6/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 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
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 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 17.1 — up to +16.6 composite points
Contract Governance scores 4.5 — up to +11.5 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/skillsync/apis.yml: open an issue on github.com/api-evangelist/skillsync 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.

Skillsync MCP server

Skillsync ships an official Model Context Protocol server as a subcommand of its CLI binary: `skl mcp`, running over stdio (no hosted URL, no port). Connect it to Claude Code, C...

MCP SERVER

Security Posture 2

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

Skillsync Authentication

oauth2-browser · 1 scheme

SECURITY

Skillsync Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Login

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

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

CLI

CLI

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Blog

Blog

Source (apis.yml)

aid: skillsync
name: Skillsync
description: Skillsync gives AI coding sessions a permanent home — "GitHub for your agent sessions." Developers install the
  `skl` CLI, sign in once through the browser, and publish a coding session; they can then revisit past work, share the full
  context behind a change, and turn workflows that worked into reusable skills. The CLI discovers sessions from Claude Code
  (full support), Codex and OpenCode (beta), and also pi, Campfire, Cursor, Grok, Amp, and Antigravity, and ships a Model
  Context Protocol server (`skl mcp`) that gives an assistant a long memory over past and published sessions. Skillsync is
  a Y Combinator (W2026) company; it exposes no public REST API — the CLI and its bundled MCP server are the integration surface.
url: https://raw.githubusercontent.com/api-evangelist/skillsync/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://skillsync.com/opengraph-image.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: profiled
x-tier-reason: enriched-from-live-product
x-yc-batch: W2026
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Developer Tools
- Artificial Intelligence
- Agents
- Coding Assistants
- MCP
- CLI
- Knowledge Management
- Y Combinator
tags_raw:
- Company
- Developer Tools
- AI
- Agents
- Coding Assistants
- Model Context Protocol
- CLI
- Knowledge Management
- Y Combinator
- Knowledge-Management
apis: []
common:
- url: https://skillsync.com/blog/rss.xml
  type: BlogRSS
- type: DomainSecurity
  url: security/skillsync-domain-security.yml
- type: Website
  url: https://skillsync.com
- type: DeveloperPortal
  url: https://skillsync.com/docs/quickstart
- type: Documentation
  url: https://skillsync.com/docs/quickstart
- type: GettingStarted
  url: https://skillsync.com/docs/quickstart
- type: Blog
  url: https://skillsync.com/blog
- type: GitHubOrganization
  url: https://github.com/skillsynchq
- type: Login
  url: https://skillsync.com/login
- type: PrivacyPolicy
  url: https://skillsync.com/privacy
- type: MCPServer
  name: Skillsync MCP server
  url: mcp/skillsync-mcp.yml
- type: CLI
  name: skl CLI
  url: cli/skillsync-cli.yml
- type: Packages
  name: skl CLI binary
  url: packages/skillsync-packages.yml
- type: Authentication
  url: authentication/skillsync-authentication.yml
- type: ChangeLog
  url: changelog/skillsync-changelog.yml
- type: LLMsTxt
  url: llms/skillsync-llms.txt
- type: Conformance
  url: conformance/skillsync-conformance.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 9
  pass: local-v1

Skillsync API — frequently asked questions

How do I authenticate with the Skillsync API?

Skillsync uses bearer-token authentication (oauth2-browser · 1 scheme). The details are profiled on APIs.io as Skillsync Authentication.

Does Skillsync have an MCP server?

Yes. APIs.io lists 1 MCP server for Skillsync: Skillsync ships an official Model Context Protocol server as a subcommand of its CLI binary: `skl mcp`, running over stdio (no hosted URL, no port). Connect it to Claude Code, Claude Desktop, or Curso

Is the Skillsync API ready for AI agents?

Skillsync has a Kin Score of 22.9 out of 100 (emerging) and an Agent Readiness score of 6.0 (agent-aware), 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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Every operation they expose

curl "https://apis.io/api/v1/providers/skillsync/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/skillsync/evidence"

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