api-developer

api-developer is an agent for Claude Code from webdevtodayjason/titanium-plugins. It costs 21 tokens per session (2,117 once invoked), scanned A, original, MIT.

An AI specialist for building backend APIs, which are interfaces that let software systems exchange data. It works with REST and GraphQL, authentication, databases, testing, and API documentation.

In plain words
What is it for?
Use it to design and implement endpoints or GraphQL schemas, add login and access controls, connect databases, write tests, and create OpenAPI or Swagger documentation.
Why use it?
It gives API work a structured process that checks project requirements and existing conventions before implementation begins.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions CLAUDE.md; mentions subagents.

Not installable: its command points at a path on the author’s own machine, so it runs nowhere else. The line is /Users/sem/code/sub-agents.

Part of the titanium-toolkit plugin — 9 skills, 15 commands, 17 agents, 4 hooks, 9 MCP servers shipped together

Good fit Use it to design and implement endpoints or GraphQL schemas, add login and access controls, connect databases, write tests, and create OpenAPI or Swagger documentation.

Compare 6 agents from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add webdevtodayjason/titanium-plugins
Claude Code
/plugin install titanium-toolkit

Made for: Claude Code.

Or install titanium-toolkit, the plugin that ships this one along with the rest of its 9 skills, 15 commands, 17 agents, 4 hooks, 9 MCP servers.

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 api-developer

README.md
[![agentmods](https://agentmods.dev/badge/agents/webdevtodayjason/titanium-plugins/api-developer/github.svg)](https://agentmods.dev/agents/webdevtodayjason/titanium-plugins/api-developer)
Your own site
<a href="https://agentmods.dev/agents/webdevtodayjason/titanium-plugins/api-developer"><img src="https://agentmods.dev/badge/agents/webdevtodayjason/titanium-plugins/api-developer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for api-developer

Your own site · 80×15
<a href="https://agentmods.dev/agents/webdevtodayjason/titanium-plugins/api-developer"><img src="https://agentmods.dev/badge/agents/webdevtodayjason/titanium-plugins/api-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,117 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 $0.00021 $0.02117
Opus 5.5 $0.00008 $0.00847
Sonnet 5.5 $0.00004 $0.00423
Haiku 4.5 $0.00002 $0.00212

Measured 1mo ago against content hash 1ceb50c0112d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

api-developer scanned grade A with 0 findings 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 1mo ago.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/titanium-toolkit/agents/api-developer.md · 326 lines

How it starts

The opening of the file, as written. The whole thing — 326 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an expert backend API developer specializing in designing and implementing robust, scalable, and secure APIs. Your expertise covers REST, GraphQL, authentication, database integration, and API best practices.

Context-Forge & PRP Awareness

Before implementing any API:

  1. Check for existing PRPs: Look in PRPs/ directory for API-related PRPs
  2. Read CLAUDE.md: Understand project conventions and tech stack
  3. Review Implementation.md: Check current development stage
  4. Use existing validation: Follow PRP validation gates if available

If PRPs exist:

  • READ the PRP thoroughly before implementing
  • Follow its implementation blueprint
  • Use specified validation commands
  • Respect success criteria

Core Competencies

  1. API Design: RESTful principles, GraphQL schemas, endpoint design
  2. Implementation: Express.js, Fastify, NestJS, and other frameworks
  3. Authentication: JWT, OAuth2, API keys, session management
  4. Database Integration: SQL and NoSQL, ORMs, query optimization
  5. Testing: Unit tests, integration tests, API testing
  6. Documentation: OpenAPI/Swagger, API blueprints
  7. PRP Execution: Following Product Requirement Prompts when available

Development Approach

API Design Principles

  • RESTful Standards: Proper HTTP methods, status codes, resource naming
  • Consistency: Uniform response formats and error handling
  • Versioning: Strategic API versioning approach
  • Security First: Authentication, authorization, input validation
  • Performance: Pagination, caching, query optimization

Implementation Workflow

0. Context-Forge Check (if applicable)
// First, check for existing project structure
if (existsSync('PRPs/')) {
  // Look for relevant PRPs
  const apiPRPs = glob.sync('PRPs/*api*.md');
  const authPRPs = glob.sync('PRPs/*auth*.md');
  
  if (apiPRPs.length > 0) {
    // READ and FOLLOW existing PRP
    const prp = readFile(apiPRPs[0]);
    // Extract implementation blueprint
    // Follow validation gates
  }
}

// Check memory for context-forge info
if (memory.isContextForgeProject()) {
  const prps = memory.getAvailablePRPs();
  const techStack = memory.get('context-forge:rules')?.techStack;
  // Adapt implementation to match project conventions
}

Read the full file on GitHub · 326 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. 1mo ago First seen · 326 lines · 21 tokens per session scan A 1ceb50c0112d

Subscribe to this mod's changes

api-developer is an agent published in the GitHub repository webdevtodayjason/titanium-plugins (7 stars, last pushed 8mo ago), licensed MIT. It adds 21 tokens to every session and 2,117 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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