The server provides 4 well-named tools with clear, descriptive text and complete input schemas. All tools follow verb_noun naming conventions (list_commits, get_commit_changes, compare_branches, get_work_item_commits) appropriate to their actions. Descriptions are substantive (85-180 chars) and explain purpose, use cases, and return structure. Input schemas use proper JSON Schema with type definitions and per-parameter descriptions. Parameters accept both human-friendly names (branch, author) and system IDs (repositoryId). Error handling is present via sanitizeErrorMessage and errorResponse utilities with path/URL redaction. However, output schemas are not formally documented in the tool definitions, the code uses structuredResponse() but the outputSchema contract is inferred rather than declared. Parameters lack enum constraints where beneficial (e.g., 'top' is unbounded despite defaulting to reasonable limits). Tool descriptions could better explain interdependencies (e.g., when to use compare_branches vs list_commits). No tool-level risk annotations visible in schema (toolAnnotations=true in features, but implementation not shown in source). The security patterns (credential injection, audit logging) are present but not surfaced in tool metadata.

• Add formal outputSchema JSON Schemas to each tool definition. Example for list_commits: { type: 'object', properties: { commits: { type: 'array', items: { type: 'object', properties: { commitId: { type: 'string' }, message: { type: 'string' }, author: { type: 'string' }, date: { type: 'string', format: 'date-time' } } } }, total: { type: 'number' } } }.
• Constrain numeric parameters: add minValue and maxValue to top (1 - 500) and skip (0 - 10000). Document in parameter descriptions: 'Maximum 100 results per call (default 25). Use skip for pagination.'
• Enhance descriptions with recovery hints. E.g., list_commits: 'If filtering yields no results, try list_branches() to verify branch name or expand date range.'
• Add readOnlyHint: true to all 4 tools in their definitions to signal to clients that these are safe to call without side effects.
• Document tool precedence and use cases: 'Use list_commits for history, compare_branches for diff review, get_work_item_commits for traceability to tickets.' Include these in a server-level instruction or tool group annotations.
• Consider adding optional pagination metadata (nextCursor, hasMore) to responses so LLMs can iterate without re-calling with calculated offsets.