# tessl.io

**Canonical:** https://apis.io/providers/tesslio/  
**Website:** https://tessl.io  
**APIs profiled:** 35

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.

## Kin Score — 50.4 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 50.4).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 49.0 |
| Governance | 11.5 |
| Operational Transparency | 55.3 |
| Developer Ergonomics | 75.5 |
| Commercial Clarity | 31.6 |

## Agent readiness — 60.1 (agent-native)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| MCP Server | yes |
| Auth Clarity | yes |
| Idempotency | verified |
| Error Semantics | documented |
| OpenAPI Examples | verified |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (35)

- **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.

## MCP servers (1)

- **tesslio-mcp.yml**

## Agentic access (1)

- **Tesslio Agentic Access** — 225 operations · 111 acting · 19 human-in-the-loop

## Security (4)

- **Tesslio Authentication** — http-bearer/apiKey/oauth2 · 4 schemes
- **Tesslio Domain Security** — TLSv1.3 · HSTS · DMARC
- **Tesslio Vulnerability Disclosure** — security.txt · contact published
- **Tesslio Trust Center** — trust center published

## Tags

Company, Ai Ml, Agent Enablement, Agentic Development, Developer Tools, Skills Registry, Model Context Protocol, Spec-Driven Development, Code Review, CLI

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/tesslio/). Scores are computed from the provider's own public artifacts under a published rubric.