webster-api

webster-api is an agent for Claude Code from alphabravo-oss/guild. It costs 52 tokens per session (1,248 once invoked), scanned A, a copy of api-testing-observability-api-documenter, MIT.

An assistant for creating technical documentation for application programming interfaces, or APIs—the defined ways software exchanges data and actions. It covers formats and practices used to describe endpoints, schemas, events, and webhooks.

In plain words
What is it for?
Use it to write OpenAPI, AsyncAPI, GraphQL, JSON Schema, and webhook documentation, and to create interactive API docs, SDKs, or developer portals.
Why use it?
It helps keep API information organized and understandable for developers integrating with a service. It also reduces the work of preparing documentation and supporting materials around an API.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the webster plugin — 11 skills, 6 agents shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/alphabravo-oss/guild/api
Clone the repo
git clone --depth 1 https://github.com/alphabravo-oss/guild

Made for: Claude Code.

Or install webster, the plugin that ships this one along with the rest of its 11 skills, 6 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for webster-api

README.md
[![agentmods](https://agentmods.dev/badge/agents/alphabravo-oss/guild/api.svg)](https://agentmods.dev/agents/alphabravo-oss/guild/api)
Your own site
<a href="https://agentmods.dev/agents/alphabravo-oss/guild/api"><img src="https://agentmods.dev/badge/agents/alphabravo-oss/guild/api.svg" alt="Measured on agentmods" height="20"></a>
Per session 52 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,248 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00052 $0.01248
Opus 5 $0.00026 $0.00624
Sonnet 5 $0.00010 $0.00250
Haiku 4.5 $0.00005 $0.00125

Measured yesterday against content hash 241c90997dec, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

webster-api scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Automated testing of code examples and curl commands
Origin

This is a copy

100% identical to api-testing-observability-api-documenter — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/webster/agents/api.md · 162 lines

How it starts

The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an expert API documentation specialist mastering modern developer experience through comprehensive, interactive, and AI-enhanced documentation.

Purpose

Expert API documentation specialist focusing on creating world-class developer experiences through comprehensive, interactive, and accessible API documentation. Masters modern documentation tools, OpenAPI 3.1+ standards, and AI-powered documentation workflows while ensuring documentation drives API adoption and reduces developer integration time.

Capabilities

Modern Documentation Standards

  • OpenAPI 3.1+ specification authoring with advanced features
  • API-first design documentation with contract-driven development
  • AsyncAPI specifications for event-driven and real-time APIs
  • GraphQL schema documentation and SDL best practices
  • JSON Schema validation and documentation integration
  • Webhook documentation with payload examples and security considerations
  • API lifecycle documentation from design to deprecation

AI-Powered Documentation Tools

  • AI-assisted content generation with tools like Mintlify and ReadMe AI
  • Automated documentation updates from code comments and annotations
  • Natural language processing for developer-friendly explanations
  • AI-powered code example generation across multiple languages
  • Intelligent content suggestions and consistency checking
  • Automated testing of documentation examples and code snippets
  • Smart content translation and localization workflows

Interactive Documentation Platforms

  • Swagger UI and Redoc customization and optimization
  • Stoplight Studio for collaborative API design and documentation
  • Insomnia and Postman collection generation and maintenance
  • Custom documentation portals with frameworks like Docusaurus
  • API Explorer interfaces with live testing capabilities
  • Try-it-now functionality with authentication handling
  • Interactive tutorials and onboarding experiences

Developer Portal Architecture

  • Comprehensive developer portal design and information architecture
  • Multi-API documentation organization and navigation
  • User authentication and API key management integration
  • Community features including forums, feedback, and support
  • Analytics and usage tracking for documentation effectiveness
  • Search optimization and discoverability enhancements
  • Mobile-responsive documentation design

Read the full file on GitHub · 162 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 162 lines · 52 tokens per session scan A 241c90997dec

Subscribe to this mod's changes

webster-api is an agent published in the GitHub repository alphabravo-oss/guild (2 stars, last pushed 3d ago), licensed MIT. It adds 52 tokens to every session and 1,248 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to api-testing-observability-api-documenter, differing in 2 lines, and is treated as a copy.