JSONShelf

io.github.walkojas-boopPublished by GitHub account walkojas-boopv1.0.0Updated Oct 24, 2026

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

VerifiedStreamable HTTPWeb executableDeveloper Tools

Overview

AI-generated overview

Lets an assistant repair, validate, generate examples for, and schema-coerce JSON deterministically without calling an LLM.

What you can do
JSONShelf is a remote MCP endpoint that works on JSON data. According to its description, it offers deterministic JSON repair, validation, example generation, and schema coercion for agents, with no LLM involved and sub-10ms operation. No individual tools are listed in the manifest, so the exact tool names and parameters are not documented here.
When to use it
Worth adding when an assistant frequently handles malformed or schema-bound JSON and you want fast, predictable fixes and checks rather than model-generated guesses. Useful in agent pipelines where JSON output must be validated or coerced before the next step.
Requirements
A remote streamable HTTP endpoint at the provider's hosted address; no packages, environment variables, or headers are declared. No authentication is declared, so no credentials appear to be needed. Network access to the endpoint is required.
Before you install
The server is hosted by a third party, so any JSON sent to it leaves your machine; avoid sending secrets or sensitive data. No authentication is declared, meaning the endpoint may be open or unauthenticated. The manifest lists no tools, so verify actual behavior before relying on it.

Installation

In SourceWeft

  1. Open JSONShelf in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.walkojas-boop%2Fjsonshelf/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

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

README

This repository has no README.

Tools

4

jsonshelf_repair

Repair malformed JSON. Returns valid JSON plus a diff of what was fixed.

Parametersmodeinputrequiredschema

jsonshelf_validate

Validate JSON against a schema. Returns structured errors with JSON Pointer paths and remedies.

Parametersinputrequiredschemarequired

jsonshelf_example

Generate a minimal valid example matching a JSON schema.

Parametersschemarequired

jsonshelf_coerce

Soft-cast values to match a schema (string "42" → 42 for integer fields, etc.).

Parametersinputrequiredschemarequired

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

75% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • License10 pts

    Declare a license in the repository or the registry entry.