[BUG] Bug: MCP tools require approval despite being in settings.json allowlist

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Error message: Streamable HTTP error: Error POSTing to endpoint: MCP tool call requires approval

Environment: Claude Code on the web (cloud/remote execution)

What was tried in [.claude/settings.json] permissions.allow:

Wildcard patterns: mcp____list_events, mcp____read_file_content, etc.
Exact human-readable names: mcp__Google-Calendar__list_events, mcp__Todoist__find-tasks-by-date, etc.
UUID-prefixed names (copied from runtime tool names): mcp__c8585ad8-2e4b-4d71-9b14-cd8d45bdb660__list_events, etc.
All three formats produce the same error. Tools load successfully (schemas resolve via ToolSearch) but every call is blocked regardless of allowlist configuration.

Affected MCP servers: Google Calendar, Todoist, Google Drive, Box

What Should Happen?

Expected behavior: Tools listed in permissions.allow should execute without prompting.

Error Messages/Logs

Error message: Streamable HTTP error: Error POSTing to endpoint: MCP tool call requires approval

Steps to Reproduce

What was tried in [.claude/settings.json] permissions.allow:

Wildcard patterns: mcp____list_events, mcp____read_file_content, etc.

Exact human-readable names: mcp__Google-Calendar__list_events, mcp__Todoist__find-tasks-by-date, etc.

UUID-prefixed names (copied from runtime tool names): mcp__c8585ad8-2e4b-4d71-9b14-cd8d45bdb660__list_events, etc.

All three formats produce the same error. Tools load successfully (schemas resolve via ToolSearch) but every call is blocked regardless of allowlist configuration.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.8089.1 (b98a06)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_