Server has 7 tools with basic descriptions but critical gaps in schema visibility and parameter documentation. Tool names follow verb_noun convention (list_, read_, get_, search_, send_, react_to_). Descriptions are present but brief (10-50 chars for most). No input schemas visible in provided source code, cannot verify parameter types, constraints, or output structures. Error handling and recovery guidance absent. Security: credentials handled via environment (GROUPME_ACCESS_TOKEN), which is correct. Composition is reasonable (single responsibility per tool), but lack of schema documentation prevents confident assessment of chaining capability.

• Add explicit JSON Schema definitions for all tool inputs. Include type, description, enum/pattern constraints, and required fields. Example: 'group_id' (string, required, 'The GroupMe group ID from list_conversations'), 'limit' (integer, 1-100, default 20).
• Expand tool descriptions to 100-200 chars. Include: what it does, when to use it vs similar tools, prerequisites, and key output fields. E.g., 'read_messages: Fetch message history from a conversation (oldest first). Use after list_conversations to get group_id. Returns messages with IDs for react_to_message. Supports pagination via next_before_id cursor.'
• Document output schemas for all tools. Specify field names, types, and which fields are required for downstream tool calls. E.g., list_conversations must return group_id and other_user_id for use in read_messages.
• Add error handling with recovery hints. E.g., 'Group not found (404). Call list_conversations() to see available groups and their IDs.' Categorize errors as retryable (rate limit, timeout) vs user-fixable (invalid ID, permission denied).
• For write operations (send_message, react_to_message), add a dry_run parameter or confirmation step. Document idempotency: 'Calling send_message twice with the same text creates two messages (not idempotent). Use message_id to avoid duplicates.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry