Problem

browse_mr_discussions with action list can hang for extended periods (observed 80+ seconds) when fetching discussions without explicit per_page parameter.

Root Cause Analysis

1. No default pagination - Unlike other tools that use PaginationOptionsSchema with per_page default of 20, browse_mr_discussions has no default
2. Large response payload - Discussion responses include:
   • Full diff context for each discussion
   • Position data (base_sha, head_sha, paths, line numbers)
   • Nested notes with full content
   • System notes and metadata
3. Production timeout too high - 300 seconds allows requests to hang too long

Evidence from Logs

Jan 21 23:49:29 - Executing tool: browse_mr_discussions
Jan 21 23:50:49 - Next request (80 seconds later, no completion log)

No completion or error logged - request just hangs.

Solution

1. Add default per_page: 20 to ListMrDiscussionsSchema
2. Update tool description to document the default
3. Reduce default timeout from 300s to 20s

Affected Code

• src/entities/mrs/schema-readonly.ts - ListMrDiscussionsSchema
• src/entities/mrs/registry.ts - tool description
• src/config.ts - API_TIMEOUT_MS default