# Substructure

**Canonical:** https://apis.io/providers/substructure/  
**Website:** https://substructure.ai/  
**APIs profiled:** 1

Substructure provides a cloud‑native agent harness called subs that enables developers to run unprivileged agents locally or as a client‑server system. It offers a hosted deployment, integrates with MCP servers for tool access, and supports a variety of LLM back‑ends. The platform includes extensive documentation, pricing details, llms.txt configuration, and open‑source tooling on GitHub. Substructure aims to simplify building AI‑driven workflows with secure, sandboxed execution.

## Kin Score — 41.7 / 100 (developing)

Scored 2026-10-23 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 66.1 |
| Contract Quality | 36.1 |
| Contract Governance | 22.0 |
| Operational Transparency | 13.2 |
| Developer Ergonomics | 50.0 |
| Access Clarity | 52.6 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 22.7 (matched via fallback).

## Agent readiness — 22.7 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | yes |
| Agent Skills | no |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |

## APIs (1)

- **Substructure API** — Substructure API as documented publicly: 40 operations. Contract generated from the documentation by API Evangelist (2026-10-19); not the provider's own document.

## Security (2)

- **Substructure Authentication** — 3 schemes
- **Substructure Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Substructure Plans Pricing**

## Tags

Company, Artificial Intelligence, Agents, Cloud-Native, Automation

---

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