The server has 6 well-defined tools with proper verb-noun naming (git_history_get_branch, git_history_save, etc.), complete input schemas with type information and descriptions, and clear tool descriptions. However, there are significant gaps in output schema documentation, error handling guidance, and parameter constraint clarity. Tool descriptions are adequate (100-200 chars range) but lack dependency hints and recovery guidance. The schema definitions are solid but output structures are not formally documented in the tool definitions themselves.

• Add formal output schemas to each tool definition. For git_history_list_branches, document the return structure: {branches: [{name: string, token_estimate: int, compacted_count: int, last_updated: string}], total: int}.
• Enhance error descriptions with recovery steps. E.g., git_history_get_branch should say: 'If auto-detect fails, provide an explicit branch_name parameter. Verify the repo_path is a valid Git repository.'
• Add a confirmation step for git_history_delete_branch_history. Either implement a dry-run parameter (returns what would be deleted without deleting) or a two-step pattern (delete returns a confirmation_id, then a separate confirm_delete tool completes it).
• Document parameter constraints more explicitly. For repo_path, clarify: 'Absolute path to a Git repository directory. Must be readable by the server process.' For summary in git_history_compact, specify: 'A condensed version of the history. Typically 30-50% of the original size.'
• Add idempotency guarantees to descriptions. E.g., git_history_save with append=true is idempotent if the same history is passed multiple times; idempotency should be explicitly stated.
• Document output field names and types in tool descriptions. E.g., 'Returns {success: bool, branch_name: string, token_estimate: int, last_updated: ISO8601_timestamp}'.
• Add dependency hints. E.g., 'Call git_history_list_branches first to see which branches have stored history before calling git_history_load on a specific branch.'