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404-not-found Review

404-not-found is an AI tool designed to test documentation sites by simulating real AI agents that interact with the documentation.

shipped Sep 27, 2026agentspaid
Domain rating56
agents
404-not-found — product screenshot

Why it matters

1Simulates AI agents to test documentation sites.
2Identifies documentation failures by showcasing where agents encounter issues.
3Offers a prompt for fixing identified documentation issues.
4Pricing is per-job, with a 'Gauntlet Run' tier at $7.

About 404-not-found

Business Model
Per-Job Pricing
Usage Pricing
$7/gauntlet run per run
Target Audience
Site owners and developers of API documentation

Pricing Plans

Gauntlet Run
$7 / one time
  • • Simulate 6 real agents
  • • Identify documentation failures
  • • Watch agents interact with your docs

Cost Examples

  • • 6 Dummies run for $7

overview

What is 404-not-found?

404-not-found is an AI agents tool that enables site owners and developers of API documentation to test documentation sites by simulating real AI agents that interact with the documentation. It identifies documentation failures by showcasing where agents encounter issues when making API calls based on the provided documentation, offering a prompt for fixing these issues.

features

Key Features of 404-not-found

404-not-found provides specific functionalities to assess the efficacy of documentation for AI agent interaction. Its core features focus on simulation, failure identification, and remediation guidance.

  • Runs simulated agents to test documentation, mimicking how AI agents interpret content.
  • Shows the exact page where agents fail, pinpointing problematic sections within the documentation.
  • Offers a prompt for fixing documentation issues, providing actionable advice for improvement.
  • Identifies documentation failures by observing agent behavior during API call attempts.
  • Showcases where agents encounter issues when making API calls based on the provided documentation.

use cases

Who Should Use 404-not-found?

404-not-found is primarily intended for site owners and developers responsible for API documentation, particularly those aiming to ensure their documentation is clear and usable for AI agents.

  • Site owners testing documentation for AI compatibility to ensure seamless integration with AI-driven tools.
  • Developers identifying gaps in API documentation that lead to agent failures during API calls.
  • Teams improving user experience by fixing documentation issues, thereby enhancing clarity and accuracy for all users, including AI agents.

how to use

How to Use 404-not-found

To use 404-not-found, users initiate a 'Gauntlet Run' which deploys simulated AI agents to interact with specified documentation. The tool then reports on agent failures and provides insights for remediation.

  • 1Navigate to the 404-not-found platform at https://404-not-found.nanocorp.app/.
  • 2Initiate a 'Gauntlet Run' for your documentation site.
  • 3Observe the simulated AI agents as they interact with the provided documentation.
  • 4Review the generated report, which highlights exact pages and instances where agents encountered issues.
  • 5Utilize the provided prompts to fix identified documentation failures and improve clarity.

pricing

404-not-found Pricing & Plans

404-not-found operates on a per-job business model, with a single pricing tier for its core service. The cost is fixed per 'Gauntlet Run', allowing users to pay only for the testing they require.

  • Gauntlet Run: $7 per run (e.g., 6 Dummies run for $7).

Pros

  • +Simulates actual AI agent behavior, providing a unique testing perspective.
  • +Pinpoints exact documentation sections causing agent failures.
  • +Offers actionable prompts for fixing identified documentation issues.
  • +Focuses specifically on documentation usability for AI, a niche not covered by traditional API testing tools.
  • +Simple per-job pricing model at $7 per 'Gauntlet Run'.

Cons

  • −Limited to testing documentation for AI agent compatibility; not a general-purpose API testing suite.
  • −Does not provide detailed API contract validation like Dredd or linting like Spectral.
  • −Requires manual intervention to implement the suggested documentation fixes.
  • −Pricing is per-run, which could accumulate for frequent or extensive testing needs.
  • −Specific models used by the simulated agents are not disclosed.

Similar Tools

404-not-found vs Competitors

404-not-found differentiates itself from traditional API testing and documentation linting tools by focusing on AI agent simulation rather than manual test case definition or specification validation.

1

An open-source, cross-platform API client that allows you to design, debug, and test APIs by manually creating and organizing requests.

While Insomnia allows you to manually create and automate API tests based on documentation, it doesn't simulate an AI agent interpreting the documentation to generate those tests; you define the test cases yourself.

2
Dredd↗

A command-line tool that validates API implementations against their formal OpenAPI (Swagger) or API Blueprint specifications, ensuring contract adherence.

Dredd focuses on contract testing, verifying that your API's responses match its documented specification. It doesn't simulate an AI agent's interaction with human-readable documentation or its ability to make API calls based on that interpretation, but rather checks the API against a formal specification.

3
Spectral↗

A flexible OpenAPI and JSON Schema linter that helps enforce style guides and best practices for API documentation specifications.

Spectral helps ensure the quality and consistency of your API specifications (which serve as documentation) by linting them. It doesn't perform live API calls or simulate an AI agent's interaction with the documentation to find usability issues, but rather validates the documentation's structure and content.

4

A comprehensive platform for API development, testing, and collaboration, allowing users to create, send, and automate API requests and build test suites.

Postman provides robust tools for creating and automating API tests based on your documentation. However, it requires you to manually define the test cases and doesn't offer the AI agent simulation aspect of 404-not-found, where an agent autonomously attempts to use the documentation.

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