Neverparse

What it does

Convert tool definitions between OpenAI function calling, Anthropic tool use, MCP tool schema, and JSON Schema formats. Agents use ToolBridge to work across providers without manual format translation.

Try it live

POST/api/v1/toolbridge/convert

Request Body

Response

Click "Run" to see the response

Endpoints

POST

/api/v1/toolbridge/convert

Convert a tool definition between formats

POST

/api/v1/toolbridge/detect

Auto-detect the format of a tool definition

POST

/api/v1/toolbridge/batch

Convert up to 100 tool definitions at once

Request / Response Schema

Field

Type

Required

Description

data

object | array

Yes

The JSON data to process

schema

object

Response

Inferred JSON Schema

format

string

Optional

Output format (typescript, zod)

Examples

cURLbash

curl -X POST https://neverparse.com/api/v1/toolbridge/convert \
  -H &#39;Content-Type: application/json' \
  -d &#39;{"tool": {"type": "function", "function": {"name": "get_weather", "description": "Get weather", "parameters": {"type": "object", "properties": {"location": {"type": "string"}}, "required": ["location"]}}}, "from": "openai", "to": "anthropic"}'

TypeScripttypescript

const res = await fetch(class="token-string">&#39;https:class="token-comment">//neverparse.com/api/v1/toolbridge/convert&#39;, {
  method: class="token-string">&#39;POST&#39;,
  headers: { class="token-string">&#39;Content-Type&#39;: class="token-string">&#39;application/json&#39; },
  body: JSON.stringify({
    tool: { type: class="token-string">&#39;function&#39;, function: { name: class="token-string">&#39;get_weather&#39;, description: class="token-string">&#39;Get weather&#39;, parameters: { type: class="token-string">&#39;object&#39;, properties: { location: { type: class="token-string">&#39;string&#39; } }, required: [class="token-string">&#39;location&#39;] } } },
    from: class="token-string">&#39;openai&#39;,
    to: class="token-string">&#39;anthropic&#39;
  })
});
const { result } = await res.json();

Pythonpython

import requests
res = requests.post(&class="token-comment">#39;https://neverparse.com/api/v1/toolbridge/convert&#39;,
  json={&class="token-comment">#39;toolclass="token-string">&#39;: {&#39;typeclass="token-string">&#39;: &#39;functionclass="token-string">&#39;, &#39;functionclass="token-string">&#39;: {&#39;nameclass="token-string">&#39;: &#39;get_weatherclass="token-string">&#39;, &#39;descriptionclass="token-string">&#39;: &#39;Get weatherclass="token-string">&#39;, &#39;parametersclass="token-string">&#39;: {&#39;typeclass="token-string">&#39;: &#39;objectclass="token-string">&#39;, &#39;propertiesclass="token-string">&#39;: {&#39;locationclass="token-string">&#39;: {&#39;typeclass="token-string">&#39;: &#39;stringclass="token-string">&#39;}}, &#39;requiredclass="token-string">&#39;: [&#39;locationclass="token-string">&#39;]}}}, &#39;fromclass="token-string">&#39;: &#39;openaiclass="token-string">&#39;, &#39;toclass="token-string">&#39;: &#39;anthropic&#39;})
result = res.json()[&class="token-comment">#39;result&#39;]

Get started with ToolBridge

Free tier available. No credit card required.

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Documentation

Authentication

Include your API key in the Authorization header:

Authorization: Bearer YOUR_API_KEY

Rate Limits

Free

100 req/day

Pro

10,000 req/day

Enterprise

Unlimited

Error Codes

All errors return structured JSON with code, message, and details fields.

Error Responsejson

{
  "error": {
    "code": "INVALID_INPUT",
    "message": "The &#39;data&#39; field is required",
    "details": {
      "field": "data",
      "expected": "object | array"
    }
  }
}