The server demonstrates solid foundational quality with well-structured tool definitions, consistent naming conventions, and comprehensive parameter schemas. All 12 tools follow verb_noun naming (jenkins_get_*, jenkins_start_*, jenkins_stop_*, jenkins_wait_*, jenkins_search_*) which aligns with the 90th percentile baseline. Descriptions are present for all tools and most parameters. However, several critical gaps prevent a higher score: (1) Output schemas are not explicitly documented in the source code, types are inferred from Go struct definitions but not formally described in tool registration; (2) Parameter descriptions lack specificity around constraints and formats in some cases; (3) Error handling patterns are not visible in the provided source, making it unclear whether error responses guide LLM recovery; (4) No tool annotations (readOnlyHint, destructiveHint, idempotentHint) are present despite clear risk classifications in the specification. The tools address a cohesive domain (Jenkins CI/CD operations) with good composition (separate tools for each action) and proper chaining potential (e.g., jenkins_start_job returns queueId, used by jenkins_wait_for_queue_item). Most parameter descriptions (72 chars average baseline) are met or exceeded. Tool descriptions average ~120-150 chars, within the 10-1024 char guidance. The main issue is that formalized output schema documentation and error recovery guidance are missing from the visible code.

• Add explicit JSON Schema definitions for all tool output types (BuildLogs, Build, RunningBuild, QueuedBuild, QueueItem, etc.) in the tool registration. Include field descriptions and types so LLMs understand response structure and can chain calls correctly.
• Annotate tools with risk semantics using readOnlyHint, destructiveHint, and idempotentHint in tool registration. jenkins_start_job and jenkins_stop_build should be marked as destructive; read-only tools like jenkins_get_* should be marked readonly. This guides LLM reasoning about replay safety.
• Add comprehensive error recovery guidance. For example, if jenkins_get_job fails with 'job not found', suggest 'Try jenkins_search_builds() to find available jobs.' If jenkins_wait_for_queue_item times out, guide the LLM to check build status with jenkins_get_build().
• Add enum constraints to string filters: 'result' in jenkins_search_builds should be formally declared as enum: [SUCCESS, FAILURE, ABORTED, UNSTABLE]. Document valid parameter values in descriptions (e.g., 'job_name supports folder paths like "folder/job"').
• Implement pagination for jenkins_get_jobs and jenkins_get_running_builds. Add optional 'limit' and 'offset' parameters, default to 20 items per page, and document the maximum result set size in the description.
• Clarify jenkins_start_job parameters map structure. Either provide an example of expected keys (e.g., 'String or boolean parameter names as used in the Jenkins UI') or link to Jenkins documentation so LLMs know what parameter names are valid.