Tessl

Tessl is an agent-enablement platform that gives engineering teams a management layer for AI agent skills and plugins: continuously build, test, distribute, and optimize the context that coding agents rely on, with the security and governance of enterprise software. It centers on the Tessl Registry (3,000+ public skills plus private workspaces), the Tessl CLI, a first-party MCP server and workspace MCP gateway, Snyk-powered security scanning with install policies, and quality reviews and evaluations that can gate skills in CI. Skills and plugins are agent-agnostic, working across Claude Code, Cursor, Copilot, Gemini, and others. Founded by Guy Podjarny (Snyk); backed by Accel and GV.

Tessl is profiled on the APIs.io network. Tagged areas include Company, Ai, Agents, Agentic Development, and Developer Tools.

Tessl’s developer surface includes documentation, getting-started guide, engineering blog, pricing, support, changelog, CLI, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub
31.4/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-23 · rubric v0.5
AccessSelf serve
0 APIs 1 MCP Servers
CompanyAiAgentsAgentic DevelopmentDeveloper ToolsAgent SkillsMCPCLIRegistryCode Review

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-23 · rubric v0.5
Composite quality — 31.4/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 12.2 / 20
Commercial Clarity 6.3 / 20
Operational Transparency 6.2 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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 4 / 4
Consent & Bot Identity 3 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/tessl: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

MCP Servers 1

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

tessl-mcp.yml

MCP SERVER

Security Posture 4

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

Tessl Authentication

oauth2/openIdConnect · 2 schemes

SECURITY

Tessl Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Tessl Vulnerability Disclosure

security.txt · contact published

SECURITY

Tessl Trust Center

trust center published

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 Login
Login

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 CLI
CLI
 Packages
Packages

Access & Security 6

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 SecurityTxt
SecurityTxt
 Authentication
Authentication
 DomainSecurity
DomainSecurity
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 ChangeLog
ChangeLog

Commercial 1

Pricing, plans, and the legal terms of use

Pricing
Pricing

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: tessl
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/tessl.png
name: Tessl
description: 'Tessl is an agent-enablement platform that gives engineering teams a management layer for AI agent skills and
  plugins: continuously build, test, distribute, and optimize the context that coding agents rely on, with the security and
  governance of enterprise software. It centers on the Tessl Registry (3,000+ public skills plus private workspaces), the
  Tessl CLI, a first-party MCP server and workspace MCP gateway, Snyk-powered security scanning with install policies, and
  quality reviews and evaluations that can gate skills in CI. Skills and plugins are agent-agnostic, working across Claude
  Code, Cursor, Copilot, Gemini, and others. Founded by Guy Podjarny (Snyk); backed by Accel and GV.'
url: https://raw.githubusercontent.com/api-evangelist/tessl/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
- gv
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Ai
- Agents
- Agentic Development
- Developer Tools
- Agent Skills
- MCP
- CLI
- Registry
- Code Review
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.tessl.io/
- type: DeveloperPortal
  url: https://docs.tessl.io/
- type: Documentation
  url: https://docs.tessl.io/reference/cli-commands.md
- type: GettingStarted
  url: https://docs.tessl.io/introduction-to-tessl/set-up-tessl
- type: Blog
  url: https://tessl.io/blog
- type: Pricing
  url: https://tessl.io/pricing
- type: Login
  url: https://tessl.io/login/
- type: Support
  url: https://discord.com/invite/jbb2vHnHZQ
- type: GitHubOrganization
  url: https://github.com/tesslio
- type: StatusPage
  url: https://tesslstatus.io/
- type: TrustCenter
  url: https://trust.tessl.io/
- type: ChangeLog
  url: changelog/tessl-changelog.yml
- type: MCPServer
  url: mcp/tessl-mcp.yml
- type: CLI
  url: cli/tessl-cli.yml
- type: Packages
  url: packages/tessl-packages.yml
- type: LLMsTxt
  url: llms/tessl-llms.txt
- type: WellKnown
  url: well-known/tessl-well-known.yml
- type: SecurityTxt
  url: well-known/tessl-security.txt
- type: Authentication
  url: authentication/tessl-authentication.yml
- type: Conventions
  url: conventions/tessl-conventions.yml
- type: Conformance
  url: conformance/tessl-conformance.yml
- type: Lifecycle
  url: lifecycle/tessl-lifecycle.yml
- type: DomainSecurity
  url: security/tessl-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/tessl-vulnerability-disclosure.yml
- type: Security
  url: https://tessl.io/.well-known/security.txt
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 15
  pass: local-v1