tessl.io
Tessl is an agent-enablement platform for spec-driven and agentic software development. It provides a registry of versioned "tiles"/plugins (10,000+ library docs) and 3,000+ searchable Agent Skills, a CLI for authoring, linting, reviewing, and publishing skills and plugins, server-side quality reviews and Snyk-powered security scanning, eval/scenario tooling to prove a skill changes agent behavior, org/workspace governance with install policies, and a first-party Model Context Protocol (MCP) server plus a workspace MCP gateway so AI coding agents can discover and install the right context. Backed by Index Ventures. The public REST API (api.tessl.io) exposes 225 operations across tiles, skills, workspaces, orgs, projects, evals, and integrations.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles tessl.io the way a machine reads it — 41 machine-readable artifacts across 35 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — tessl.io scores 50.7/100 (developing), with a separate agent-readiness read of 72/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile tessl.io
Each block below is one kind of artifact we hold for tessl.io. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 35
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
tessl.io Admin Keys API
Admin-scoped API keys for support tooling.
tessl.io Agent Logs API
Agent and hosted-execution log uploads.
tessl.io API Keys API
Workspace and organization API keys.
tessl.io Badges API
Workspace badge generation.
tessl.io Billing API
The Billing API from tessl.io — 4 operation(s) for billing.
tessl.io Capacity API
Sandbox and capacity-lease scheduling.
tessl.io CLI API
Endpoints used by the Tessl CLI.
tessl.io Context API
The Context API from tessl.io — 3 operation(s) for context.
tessl.io Curated Lists API
Curated tile lists and items.
tessl.io Environments API
The Environments API from tessl.io — 2 operation(s) for environments.
tessl.io Evals API
Eval runs, scenarios, and solution scoring.
tessl.io Fix Runs API
The Fix Runs API from tessl.io — 4 operation(s) for fix runs.
tessl.io Generation API
Eval scenario generation runs.
tessl.io InstallPolicy API
The InstallPolicy API from tessl.io — 2 operation(s) for installpolicy.
tessl.io Integrations API
Third-party integrations (GitHub, GitLab, etc).
tessl.io Launch Runs API
The Launch Runs API from tessl.io — 4 operation(s) for launch runs.
tessl.io LLM API
The LLM API from tessl.io — 2 operation(s) for llm.
tessl.io ManagedProjectPolicy API
The ManagedProjectPolicy API from tessl.io — 1 operation(s) for managedprojectpolicy.
tessl.io MCP API
The MCP API from tessl.io — 4 operation(s) for mcp.
tessl.io Orgs API
Organizations, members, and invitations.
tessl.io Policy API
The Policy API from tessl.io — 3 operation(s) for policy.
tessl.io Projects API
Workspace projects.
tessl.io PublishPolicy API
The PublishPolicy API from tessl.io — 1 operation(s) for publishpolicy.
tessl.io Repos API
Source-control repository helpers.
tessl.io Review Runs API
The Review Runs API from tessl.io — 3 operation(s) for review runs.
tessl.io Reviews API
The Reviews API from tessl.io — 3 operation(s) for reviews.
tessl.io Search API
Search across tiles, skills, and repos.
tessl.io Security Review Runs API
The Security Review Runs API from tessl.io — 2 operation(s) for security review runs.
tessl.io SkillInventory API
The SkillInventory API from tessl.io — 24 operation(s) for skillinventory.
tessl.io Skills API
Skill discovery, reviews, and security checks.
tessl.io Tasks API
The Tasks API from tessl.io — 8 operation(s) for tasks.
tessl.io Tiles API
Tile catalog, versions, and metadata.
tessl.io Users API
User accounts and identity.
tessl.io Workflows API
Background workflow executions and repository workflow configs.
tessl.io Workspaces API
Workspaces and workspace membership.
Scroll within the panel for all 35 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
tesslio-mcp.yml
MCP SERVERSecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for tessl.io — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 6
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
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