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MCP Tool Definition Normalizer
x402
MCP Tool Definition Normalizer is a paid API for AI agents from agent.halowerk.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Accepts a list of MCP tool definitions from one or more servers and rewrites them into a single, consistent schema form, resolving variations in field names like inputSchema, input_schema, parameters, schema, and arguments.
Price / call$0.002
Success—
StatusUnknown
How this service works
Takes a list of MCP tool definitions, as returned by tools/list on any number of servers, and rewrites them into one common form. Servers disagree on where the schema lives — inputSchema, input_schema, parameters, schema or arguments are all in use — and a consumer reading only one of them loses the others silently; every spelling is accepted and the one found is reported.
Output
A list of rewritten MCP tool definitions in a single canonical schema form, with each tool's schema field unified to one consistent name regardless of the original spelling (inputSchema, input_schema, parameters, schema, or arguments). The response also reports which field name variant was found for each tool.
Example use cases
Multi-server MCP tool aggregation
“I'm pulling tool definitions from five MCP servers and each one uses a different field name for the schema — inputSchema, parameters, schema, you name it. Can you normalize all of them into one common format so my agent can read them consistently?”
Debugging silent schema field loss
“My agent is consuming MCP tool definitions but silently dropping tools from some servers because the schema field name doesn't match what it expects. Can you run these tool definitions through the normalizer so I can see which field name each server is using and get them all into one unified shape?”
Building a unified MCP tool registry
“I'm building a tool registry that aggregates MCP tools from many sources. The raw tools/list responses I've collected use at least four different field name conventions. Please normalize all these tool definitions into a single consistent form so I can index them reliably.”
Technical details
Endpoint
POSThttps://agent.halowerk.com/v1/mcp-normalizeWhen to prefer
Choose this endpoint when your agent consumes MCP tool definitions from multiple servers that use inconsistent field naming conventions and you need a single canonical representation before further processing, routing, or indexing. It is the right choice when silent field loss from schema name mismatches is a concern and when you need to know exactly which variant each server used.
Side effects
- Input list is empty — returns an error or empty result
- Tool definition lacks any recognized schema field — tool may be returned without a schema or flagged
- Malformed JSON in tool definitions — parse error returned
- Unrecognized schema field variant not in the known set — silently passed through or flagged
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tools | array | The MCP tool definitions to normalise. |
| naming | string | How to normalise tool names. |
| include_examples | boolean | Build a synthetic example call per tool. |
Tags
x402
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