Problem (one or two sentences)

MCP tools with hyphens in their names fail to execute when using native tool calling because models like Claude convert hyphens to underscores in tool names, causing the tool name parser to fail.

Context (who is affected and when)

Affects all users with MCP servers having hyphenated tool names (e.g., atlassian-jira, google-calendar) when using native tool calling with Claude.

Reproduction steps

1. Configure an MCP server with a hyphenated tool name such as atlassian-jira_search, LiteLLM does this by default when proxying more than one MCP server
2. Use native tool calling with Claude
3. Model outputs mcp__litellm__atlassian_jira_search instead of mcp--litellm--atlassian-jira_search
4. Tool call fails with RooCode invokes an invalid tool "mcp__litellm__atlassian_jira_search"

Expected result

Tool executes successfully

Actual result

Tool call fails

Variations tried (optional)

No response

App Version

v3.39.3

API Provider (optional)

OpenAI Compatible

Model Used (optional)

Claude Opus 4.5

Roo Code Task Links (optional)

No response

Relevant logs or errors (optional)