# Openprose

**Canonical:** https://apis.io/providers/openprose/  
**Website:** https://prose.md/  
**APIs profiled:** 0

OpenProse, Inc. builds an open-source (MIT) programming language for AI sessions: standing AI jobs are declared as durable Markdown contracts (`*.prose.md` files) that state what should stay true, and the system works out how much model work it takes to keep it true. The language ships as an agent skill (`open-prose`) that runs on any compliant agent host such as Claude Code, Codex, or OpenCode, and is paired with Reactor — a deterministic harness (`@openprose/reactor` SDK plus the `@openprose/reactor-cli` `reactor` binary) whose model spend scales with surprise, not the clock: a render runs only when a node's subscribed input fingerprints move, and each commit is a content-addressed receipt with no LLM in the wake/commit decision. Contract kinds are responsibility, function, gateway, pattern, and test; Forme is the semantic dependency-injection layer that wires `### Requires` facets to `### Maintains` facets. A Y Combinator company founded in 2026 (San Francisco) with open-source traction; distributed as npm packages rather than a hosted REST API.

## Kin Score — 21.0 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 21.0).

| Facet | Score |
|---|---|
| Discoverability | 57.4 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 18.4 |
| Developer Ergonomics | 64.3 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 4.3 (human-only)

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

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Openprose Domain Security** — TLSv1.3 · HSTS

## Tags

Company, AI Agents, Agent Orchestration, Developer Tools, Open-Source, Programming Language, LLM, Workflow-Automation, Y Combinator

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