MCP server

JSONShelf

io.github.walkojas-boop/jsonshelf

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Deterministic JSON repair, validate, example-gen, schema-coerce for agents. Zero LLM, sub-10ms.

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

4

Token cost

About 319 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http jsonshelf https://jsonshelf.vercel.app/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.jsonshelf]
url = "https://jsonshelf.vercel.app/mcp"

Gemini CLI

{"mcpServers":{"jsonshelf":{"httpUrl":"https://jsonshelf.vercel.app/mcp"}}}

Cursor

{"mcpServers":{"jsonshelf":{"url":"https://jsonshelf.vercel.app/mcp"}}}

VS Code

{"servers":{"jsonshelf":{"type":"http","url":"https://jsonshelf.vercel.app/mcp"}}}

Antigravity

agy mcp add jsonshelf https://jsonshelf.vercel.app/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"jsonshelf","server_url":"https://jsonshelf.vercel.app/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"jsonshelf","server_url":"https://jsonshelf.vercel.app/mcp"}

Tools

• jsonshelf_coerce ~69 tokens
  Soft-cast values to match a schema (string "42" → 42 for integer fields, etc.).
• jsonshelf_example ~57 tokens
  Generate a minimal valid example matching a JSON schema.
• jsonshelf_repair ~119 tokens
  Repair malformed JSON. Returns valid JSON plus a diff of what was fixed.
• jsonshelf_validate ~74 tokens
  Validate JSON against a schema. Returns structured errors with JSON Pointer paths and remedies.

Browse

• GitHub tools
• GitHub and code hosting
• Calling other AI models

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