Agent Toolbox

Agent Toolbox provides a free toolkit for AI agent builders, offering instant, private utilities that run directly in the browser without signup. The platform includes a directory of tools, MCP server configurations, token estimators, schema validators, and linting utilities, supporting popular LLM clients like Claude Desktop and Cursor. It aims to simplify tool integration for LLM applications, offering resources such as pricing, documentation, and community support.

Agent Toolbox publishes 2 API contracts indexed on the APIs.io network: Directory API and Tools API. Tagged areas include Artificial Intelligence, Tools, Free, Browser, and Agents.

The Agent Toolbox catalog on APIs.io includes 1 Spectral governance ruleset.

Agent Toolbox’s developer surface includes authentication, API reference, engineering blog, pricing, support, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.4/100 developing ▬ flat Agent 23/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFreemium

1 published contract 1 Agent Skills

Artificial Intelligence Tools Free Browser Agents

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 39.4/100 · developing

Contract Quality 9.1 / 21

Developer Ergonomics 4.8 / 17

Access Clarity 11.2 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.4 / 15

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
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)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 28.0 — up to +14.4 composite points
Contract Quality scores 42.9 — up to +14.3 composite points
Operational Transparency scores 0.0 — up to +13.0 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/agenttoolbox-net/apis.yml: open an issue on github.com/api-evangelist/agenttoolbox-net 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 2

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

Agent Toolbox Directory API

The Directory API from Agent Toolbox — 1 operation(s) for directory.

Agent Toolbox Tools API

The Tools API from Agent Toolbox — 4 operation(s) for tools.

Agent Skills 1

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

estimate-tokens

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Agenttoolbox Net Plans Pricing

2 plans

PLANS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Agent Toolbox API Rules

9 rules · 7 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Agenttoolbox Net Authentication

1 scheme

SECURITY

Agenttoolbox Net Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Agenttoolbox Net Agentic Access

5 operations · 3 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Conformance

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: agenttoolbox-net
name: Agent Toolbox
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://agenttoolbox.net/opengraph-image?6e07f9ba2dc69262
description: Agent Toolbox provides a free toolkit for AI agent builders, offering instant, private utilities that run directly
  in the browser without signup. The platform includes a directory of tools, MCP server configurations, token estimators,
  schema validators, and linting utilities, supporting popular LLM clients like Claude Desktop and Cursor. It aims to simplify
  tool integration for LLM applications, offering resources such as pricing, documentation, and community support.
url: https://artifacts.apis.io/agenttoolbox-net/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Artificial Intelligence
- Tools
- Free
- Browser
- Agents
tags_raw:
- AI
- Tools
- Free
- Browser
- Agent
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/agenttoolbox-net-agentic-access.yml
- type: Plans
  url: plans/agenttoolbox-net-plans-pricing.yml
- type: Spectral
  url: rules/agenttoolbox-net-rules.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/agenttoolbox-net-authentication.yml
- type: Conformance
  url: conformance/agenttoolbox-net-conformance.yml
- type: LLMsTxt
  url: llms/agenttoolbox-net-llms.txt
- type: Hosts
  url: hosts/agenttoolbox-net-hosts.yml
- type: Vendors
  url: vendors/agenttoolbox-net-vendors.yml
- type: Login
  url: https://agenttoolbox.net/signin
- type: APIReference
  url: https://agenttoolbox.net/developers
- type: DomainSecurity
  url: security/agenttoolbox-net-domain-security.yml
- type: Website
  url: https://agenttoolbox.net/
- type: Blog
  url: https://agenttoolbox.net/blog
- type: Pricing
  url: https://agenttoolbox.net/pricing
- type: TermsOfService
  url: https://agenttoolbox.net/terms
- type: PrivacyPolicy
  url: https://agenttoolbox.net/privacy
- type: Support
  url: https://agenttoolbox.net/contact
apis:
- aid: agenttoolbox-net:agenttoolbox-net-directory-api
  name: Agent Toolbox Directory API
  description: The Directory API from Agent Toolbox — 1 operation(s) for directory.
  humanURL: https://agenttoolbox.net/developers
  baseURL: https://agenttoolbox.net
  tags:
  - Directory
  properties:
  - type: OpenAPI
    url: openapi/agenttoolbox-net-directory-api-openapi.yml
- aid: agenttoolbox-net:agenttoolbox-net-tools-api
  name: Agent Toolbox Tools API
  description: The Tools API from Agent Toolbox — 4 operation(s) for tools.
  humanURL: https://agenttoolbox.net/developers
  baseURL: https://agenttoolbox.net
  tags:
  - Tools
  properties:
  - type: OpenAPI
    url: openapi/agenttoolbox-net-tools-api-openapi.yml
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 18
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Agent Toolbox API — frequently asked questions

Does Agent Toolbox have an API?

Yes. APIs.io lists 2 APIs from Agent Toolbox, including Agent Toolbox Directory API and Agent Toolbox Tools API.

Is there an OpenAPI specification for the Agent Toolbox API?

Yes. APIs.io indexes 2 OpenAPI specifications for Agent Toolbox, each linked for download from this page.

How do I authenticate with the Agent Toolbox API?

Agent Toolbox uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Agenttoolbox Net Authentication.

How much does the Agent Toolbox API cost?

APIs.io lists 2 pricing plans for Agent Toolbox, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Agent Toolbox API ready for AI agents?

Agent Toolbox has a Kin Score of 39.4 out of 100 (developing) and an Agent Readiness score of 22.9 (agent-aware), scored by API Evangelist on 2026-11-02.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

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