# Lacuna

**Canonical:** https://apis.io/providers/lacuna/  
**Website:** https://www.lacuna.fm/docs  
**APIs profiled:** 4

Lacuna (lacuna.fm), operated by JOYLINK LTD, is an AI music creation platform that turns lyrics or a plain-text style description into complete songs with vocals, alongside lyrics writing, word-level timed lyrics (LRC/SRT/VTT), lyric video export, AI mastering, mashups, stem separation, album-cover art, MIDI tooling and sheet-music conversion, plus long-form AI radio for focus, sleep and ambience. Developers get a documented REST music-generation API (OpenAPI 3.1 published at /api/openapi.json), an official TypeScript SDK, a `lacuna` CLI, and an unusually complete agent surface: a hosted Streamable-HTTP MCP server at /mcp with an anonymous tools/list, an A2A JSON-RPC agent endpoint at /a2a with a published agent card, an RFC 9727 api-catalog, RFC 8414 / RFC 9728 OAuth discovery, an agent-oriented auth.md, an llms.txt, and a packaged Agent Skill. API access requires a Pro plan or above and is billed in credits per generation.

## Kin Score — 65.5 / 100 (strong)

Scored 2026-08-12 under rubric 0.11.0. Trend: flat (+0.0 from 65.5).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 57.1 |
| Governance | 20.8 |
| Operational Transparency | 71.1 |
| Developer Ergonomics | 80.4 |
| Commercial Clarity | 76.3 |

## Agent readiness — 61.7 (agent-ready)

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

## APIs (4)

- **Lacuna MCP Server** — Hosted Model Context Protocol server (Streamable HTTP) at https://www.lacuna.fm/mcp, protocol 2025-06-18. initialize and tools/list answer anonymously and return real input sche...
- **Lacuna A2A Agent** — Agent-to-Agent JSON-RPC endpoint at https://www.lacuna.fm/a2a advertising the "Lacuna Music" agent card at /.well-known/agent-card.json (protocolVersion 0.3.0). One skill, gener...
- **Lacuna Lacuna Music API API** — The Lacuna Music API API from Lacuna — 0 operation(s) for lacuna music api.
- **Lacuna Music API** — Music generation endpoints.

## MCP servers (1)

- **lacuna-mcp.yml**

## Agentic access (1)

- **Lacuna Agentic Access** — 2 operations · 1 acting

## Security (3)

- **Lacuna Authentication** — http/oauth2 · 2 schemes
- **Lacuna Domain Security** — TLSv1.3 · HSTS · DMARC
- **Lacuna Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Lacuna Plans**

## Tags

AI Music, Music Generation, AI Song Generator, AI Lyrics Generator, Audio, MIDI, Songwriting, Generative AI, MCP Server, Agent Skill, A2A, Developer Tools

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