Ignore extra params passed to MCP tools

[Copilot]

MCP clients like n8n send additional metadata properties (action, chatInput, sessionId, toolCallId) with tool calls. The MCP SDK's default strict Zod validation rejects these, breaking integrations.

Changes

• New utility: createPassthroughSchema() wraps Zod shapes with .passthrough() to allow unknown properties
• Updated all 18 tool registrations across workouts, routines, templates, folders, and webhooks to use passthrough validation

Usage

// Before: strict validation rejects extra props
server.tool("get-workouts", "...", {
  page: z.number(),
});

// After: extra props pass through
server.tool("get-workouts", "...", createPassthroughSchema({
  page: z.number(),
}));

Tool parameters are still validated; unknown properties are simply ignored rather than causing errors.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Ignore extra params passed to the tool</issue_title>
<issue_description>When using n8n, for example, it aways sends some default tools args. This is breaking the execution. Can you make the mcp server ignore those extra params instead of failing in the validation ?

Here the error on n8n

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Ignore extra params passed to the tool #160

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✨ PR Description

Purpose: Fix MCP server tools to ignore unexpected parameters by implementing a passthrough schema helper that prevents validation errors from metadata properties.

Main changes:
- Added createPassthroughSchema utility to allow extra properties in tool parameter validation
- Replaced all tool schema definitions with passthrough-enabled schemas across multiple tool files
- Added comprehensive test suite for the new schema helper functionality

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✨ PR Review

LGTM

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