Toolbox

npx add-mcp 'https://toolbox.allthepossibles.com/mcp'

Small tools for people shipping with agents.

Each one does a single mundane job well, runs as a form, a JSON endpoint and an MCP tool, and never calls a model. Use them free. Pay $5 a month if you want them without limits.

01 Tells

Finds the AI-writing tells in a piece of text (em-dashes, "not just X but Y", triads, stock words, hidden characters) and hands back a cleaned copy.

Free: 20 runs a day, 3,000 chars each. API: POST /api/tells. MCP: check_tells.

02 Manifest cost

What an MCP server's tools/list costs in tokens on every session start, per tool, with the expensive ones named.

Free: 10 runs a day. API: POST /api/manifest-cost. MCP: manifest_cost.

03 Agent file lint

Lints a CLAUDE.md, AGENTS.md or MEMORY.md: the 200-line cap, duplicate rules, contradictions, leftover TODOs, hidden characters.

Free: 20 runs a day. API: POST /api/agent-md-lint. MCP: lint_agent_md.

04 Install snippets

Turns an MCP endpoint into the install snippet for Claude Code, Claude Desktop, Cursor, Codex and VS Code, and checks the server answers.

Free: 30 runs a day. API: POST /api/mcp-install. MCP: mcp_install_snippets.

05 AI crawlers

Reads a site's robots.txt the way GPTBot, ClaudeBot and the rest do, reports who is allowed, and drafts an llms.txt.

Free: 10 runs a day. API: POST /api/ai-crawlers. MCP: check_ai_crawlers.

07 Page meta

What a crawler and a link unfurler see on one URL: title and description with lengths, canonical, Open Graph, Twitter card, favicon, viewport, robots, JSON-LD, and the preview card that results.

Free: 20 runs a day. API: POST /api/meta. MCP: check_page_meta.

08 JSON to schema

Paste a JSON sample, or an array of them, and get a 2020-12 JSON Schema and a TypeScript type with optional keys, nullables, formats and enums inferred. Handy for MCP inputSchemas.

Free: 30 runs a day, 20,000 chars each. API: POST /api/json-schema. MCP: json_to_schema.

09 Cron explainer

Turns a cron expression into plain English and the next runs in UTC, and warns about the shapes Workers, GitHub Actions and crontab disagree on.

Free: 30 runs a day. API: POST /api/cron. MCP: explain_cron.

010 Env scrubber

Turns a.env into a safe.env.example that keeps the shape of every value, names the secrets it found by kind and line without echoing them, and flags duplicate keys, bad quoting and stray export prefixes.

Free: 30 runs a day, 20,000 chars each. API: POST /api/env-example. MCP: scrub_env.

011 Redirect tracer

Follows a URL one hop at a time and shows every status, location and timing, then flags long chains, loops, HTTPS downgrades, temporary redirects used for permanent moves and dropped paths or query strings.

Free: 20 runs a day. API: POST /api/redirects. MCP: trace_redirects.

012 Sitemap check

Finds a site's sitemaps through robots.txt, reads them (index files too), counts URLs and hosts, summarises lastmod dates, and fetches a sample of the URLs to see which ones are not a clean 200.

Free: 10 runs a day. API: POST /api/sitemap. MCP: check_sitemap.

013 JWT decoder

Decodes a JWT's header and payload, shows when it expires in plain words, and flags alg none, key-confusion headers, missing or distant expiry, and sensitive fields in the payload. It only decodes and never checks a signature.

Free: 30 runs a day. API: POST /api/jwt. MCP: decode_jwt.

Free

Every tool, right here or over the API and MCP, with a daily cap per tool per IP (10 to 30 runs, listed above). Enough to check a post, lint a file, or size up a server before you add it.

Pro $5/mo

• No daily caps on any tool, 300 requests a minute.
• Tells, the linter and JSON to schema take 200,000 characters instead of 3,000 or 20,000.
• One API key that works on every route and on /mcp.
• New tools land here first.

Or take the membership: Pro on this and four other products for $15 a month.