Truth Systems

Truth Systems builds AI governance and hallucination-detection infrastructure for regulated industries, with a focus on legal firms. Gateway, its core API product, fact-checks LLM-generated text against customer source documents in real time - decomposing a claim into statements, retrieving evidence, and returning SUPPORTS / REFUTES / NOT_ENOUGH_INFO verdicts with character-level evidence spans. Gateway deploys into the customer's own AWS or Azure account via Terraform, with a Python SDK. The company also offers Charter (AI governance for human users) and Alexandria (agent-focused governance), and is backed by Lightspeed Venture Partners.

Truth Systems publishes 1 API contract indexed on the APIs.io network: Get Context Output API. Tagged areas include Company, Artificial Intelligence, AI Governance, Hallucination Detection, and Fact Checking.

The Truth Systems catalog on APIs.io includes 1 Spectral governance ruleset.

Truth Systems’ developer surface includes developer portal, documentation, support, authentication, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.0/100 thin ▬ flat Agent 26/100 agent aware Front door AI 6/6 dominant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 MCP Servers 1 Agent Skills

Company Artificial Intelligence AI Governance Hallucination Detection Fact Checking Compliance Legal

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Information & Data Management

BC-610

Get Context Output

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 32.0/100 · thin

Contract Quality 8.3 / 19

Developer Ergonomics 9.6 / 15

Access Clarity 0.0 / 15

Operational Transparency 0.3 / 10

Contract Governance 1.6 / 9

Discoverability 4.7 / 8

Regulatory Posture 2.3 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 0.0 — up to +20.0 composite points
Contract Quality scores 44.4 — up to +13.9 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/truth-systems/apis.yml: open an issue on github.com/api-evangelist/truth-systems to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Truth Systems Get Context Output API

The Get Context Output API from Truth Systems — 1 operation(s) for get context output.

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Gateway Get Context Output API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Truth Systems Docs

Truth Systems operates a hosted, remote MCP server on its documentation site (Mintlify-hosted, streamable HTTP). The server is read-only and scoped to the Truth Systems Docs con...

MCP SERVER

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

Fact-check a claim against source documents with Gateway

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Truth Systems API Rules

43 rules · 41 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Truth Systems Gateway Overlay

3 actions · documentation · truth-systems-gateway-openapi-original.json

DERIVED

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Truth Systems Authentication

aws-iam/apiKey · 2 schemes

SECURITY

Truth Systems Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

AgentSkill

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Conformance

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: truth-systems
name: Truth Systems
description: Truth Systems builds AI governance and hallucination-detection infrastructure for regulated industries, with
  a focus on legal firms. Gateway, its core API product, fact-checks LLM-generated text against customer source documents
  in real time - decomposing a claim into statements, retrieving evidence, and returning SUPPORTS / REFUTES / NOT_ENOUGH_INFO
  verdicts with character-level evidence spans. Gateway deploys into the customer's own AWS or Azure account via Terraform,
  with a Python SDK. The company also offers Charter (AI governance for human users) and Alexandria (agent-focused governance),
  and is backed by Lightspeed Venture Partners.
url: https://raw.githubusercontent.com/api-evangelist/truth-systems/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- lightspeed-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
image: https://www.truthsystems.ai/truthsystems-logo.svg
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
x-docs-hosting: vercel
tags:
- Company
- Artificial Intelligence
- AI Governance
- Hallucination Detection
- Fact Checking
- Compliance
- Legal
apis:
- aid: truth-systems:truth-systems-get-context-output-api
  name: Truth Systems Get Context Output API
  description: The Get Context Output API from Truth Systems — 1 operation(s) for get context output.
  humanURL: https://docs.truthsystems.ai/introduction
  tags:
  - Get Context Output
  properties:
  - type: OpenAPI
    url: openapi/truth-systems-get-context-output-api-openapi.yml
  - type: Documentation
    url: https://docs.truthsystems.ai/introduction
  - type: APIReference
    url: https://docs.truthsystems.ai/api-reference/openapi.json
  - type: GettingStarted
    url: https://docs.truthsystems.ai/sdk/installation
  - type: Examples
    url: examples/truth-systems-gateway-examples.yml
common:
- type: CapabilityMap
  url: capabilities/truth-systems-capability-edges.yml
  name: Truth Systems Business Capability Map
- type: Overlay
  url: overlays/truth-systems-gateway-overlay.yaml
- type: DomainSecurity
  url: security/truth-systems-domain-security.yml
- type: Website
  url: https://www.truthsystems.ai
- type: Portal
  url: https://docs.truthsystems.ai
- type: Documentation
  url: https://docs.truthsystems.ai/introduction
- type: GitHubOrganization
  url: https://github.com/TruthSystems
- type: Support
  url: mailto:info@truthsystems.com
- type: LLMsTxt
  url: llms/truth-systems-llms.txt
- type: MCPServer
  url: mcp/truth-systems-mcp.yml
- type: Packages
  url: packages/truth-systems-packages.yml
- type: SDKs
  url: packages/truth-systems-packages.yml
- type: Authentication
  url: authentication/truth-systems-authentication.yml
- type: Conventions
  url: conventions/truth-systems-conventions.yml
- type: ErrorCatalog
  url: errors/truth-systems-problem-types.yml
- type: Conformance
  url: conformance/truth-systems-conformance.yml
- type: DataModel
  url: data-model/truth-systems-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 15
  pass: local-v1

Truth Systems API — frequently asked questions

Does Truth Systems have an API?

Yes. APIs.io lists 1 API from Truth Systems, including Truth Systems Get Context Output API.

Is there an OpenAPI specification for the Truth Systems API?

Yes. APIs.io indexes 1 OpenAPI specification for Truth Systems, each linked for download from this page.

How do I authenticate with the Truth Systems API?

Truth Systems uses bearer-token authentication (aws-iam/apiKey · 2 schemes). The details are profiled on APIs.io as Truth Systems Authentication.

Does Truth Systems have an MCP server?

Yes. APIs.io lists 1 MCP server for Truth Systems: Truth Systems operates a hosted, remote MCP server on its documentation site (Mintlify-hosted, streamable HTTP). The server is read-only and scoped to the Truth Systems Docs content: it exposes docume

Is the Truth Systems API ready for AI agents?

Truth Systems has a Kin Score of 32.0 out of 100 (thin) and an Agent Readiness score of 25.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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