[BUG] [v0.0.7] cortex-mcp-types Tool inputSchema rejects valid additionalProperties schema objects

[marvinayisi]

Project

cortex

Description

A valid tool inputSchema that uses a schema object for additionalProperties fails to deserialize into Tool.

Error Message

TOOL_ADDITIONAL_PROPERTIES_OBJECT_PARSE=Err(Error("invalid type: map, expected a boolean", line: 0, column: 0))

Debug Logs

N/A

System Information

Cortex crate: cortex-mcp-types 0.0.7
Commit: 7954d02
Date: 2026-04-10
OS: macOS

Screenshots

https://github.com/marvinayisi/issue-images/blob/main/mcp-tool-additionalproperties-object-20260410-074112.png

Steps to Reproduce

1. Create a tiny Rust crate depending on cortex-mcp-types from this workspace.
2. Deserialize a tool definition whose inputSchema.additionalProperties is { "type": "string" }.
3. Print the parse result.

Expected Behavior

The valid JSON Schema object form of additionalProperties should deserialize successfully.

Actual Behavior

Deserialization fails because ToolInputSchema.additional_properties only accepts booleans.

Additional Context

• Authoritative spec: https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/refs/heads/main/schema/2024-11-05/schema.ts
• Code path: /Users/odeili/Projects/platform/cortex/src/cortex-mcp-types/src/tools.rs
• Duplicate check on 2026-04-10:
• cortex-mcp-types Tool inputSchema additionalProperties object parse