Developer Tools
Free, browser-based utilities for prompt engineering, MCP development, and AI agent building. 23 tools — all run in your browser.
Prompt Tools
5 tools
Token counters, cost calculators, and context window analyzers for LLM prompts.
Prompt Token Counter
Count tokens in your prompts for GPT-4, Claude, Llama, and other AI models.
Prompt Cost Calculator
Estimate API costs for your prompts across major AI providers and models.
Context Window Calculator
Check if your content fits within the context window of different AI models.
AI Prompt Generator
Generate structured prompts for text tasks, coding, system instructions, agents, structured outputs, and quick image prompts.
Image Prompt Generator
Create detailed prompts for AI image generation with subject, style, lighting, camera angle, composition, aspect ratio, and negative prompt controls.
MCP Tools
10 tools
Model Context Protocol tool schema validators and server configuration helpers.
OpenAPI to MCP Generator
Convert OpenAPI JSON or YAML specs into MCP tool definitions, input schemas, and TypeScript skeletons.
MCP Tool Schema Validator
Validate MCP tool definitions — names, descriptions, inputSchema, required fields, and common mistakes.
MCP Tool Definition Generator
Generate MCP tool definitions from a form — name, description, typed input fields, and required arrays.
MCP Server Config Generator
Generate MCP server configuration snippets for Claude Desktop, Cursor, and other clients.
MCP Client Config Validator
Validate MCP client configuration JSON — mcpServers, commands, args, env, and common mistakes.
MCP Input Schema Builder
Build MCP inputSchema JSON using a form — typed fields, required arrays, enums, and TypeScript types.
MCP Server README Generator
Generate a README.md template for MCP servers with installation, config, tools, and env sections.
MCP Tool Name Generator
Generate clean, machine-friendly MCP tool names from descriptions, API paths, and action phrases.
MCP Tool Description Checker
Check MCP tool descriptions for clarity, specificity, and agent usability. Scores and suggests improvements.
MCP Tool Response Schema Builder
Build JSON Schema definitions for MCP tool response shapes — success, error, and TypeScript types.
Agent Tools
3 tools
Tools for building, auditing, and deploying AI agents — context planning, safety checklists, system prompt auditing, and response schemas.
Agent System Prompt Auditor
Audit AI agent system prompts for role clarity, safety guardrails, output format, fallback behavior, and conflicting instructions.
Agent Context Planner
Plan your AI agent context window — add system prompt, tool schemas, retrieved docs, and see how many conversation turns fit.
Agent Safety Checklist
Generate a safety checklist for AI agents based on goal, tools, and deployment environment — access control, data handling, human oversight, and more.
Agent & Skill Generators
5 tools
Create reusable instructions, skills, tool specs, and task prompts for AI agents, coding agents, Custom GPTs, and Claude workflows.
Claude Skill Generator
Generate starter Claude Skill files — SKILL.md, README.md, folder structure, and files checklist — from a form.
Coding Agent Generator
Generate starter instruction files for coding agents — AGENTS.md, CLAUDE.md, GEMINI.md, Cursor Rules, Windsurf Rules, and generic instructions.
Custom GPT Instructions Generator
Generate structured instructions, behavior rules, and conversation starters for Custom GPTs and AI assistants.
Agent Tool Spec Generator
Generate human-readable and machine-friendly specifications for tools an AI agent can use — Markdown spec, JSON spec, input schema, and usage examples.
Agent Task Prompt Generator
Generate clear, structured task prompts for coding agents — Claude Code, Cursor, Codex, Windsurf, Gemini CLI, and more.