Two tools with solid naming (verb_noun pattern) and comprehensive descriptions (180-250 chars each). Input schemas present with proper types and descriptions. However, output schemas are not documented in the visible code, only partial return structure shown in the truncated source. Error handling is present but generic. No parameter constraints (enums) despite opportunities (e.g., severity levels). Tool descriptions are good but lack explicit 'when to use' guidance and dependency hints. Missing tool annotations (readOnlyHint, idempotentHint). Both tools are READ_ONLY and idempotent, but this is not declared in the schema.

• Document the complete output schema for both tools. For validate_pine_script, specify: {valid: boolean, error_count: number, warning_count: number, diagnostics: [{line: number, column: number, severity: 0|1|2|3, message: string}]}. For lookup_pine_reference, document the signature structure (parameters, overloads, etc.).
• Add tool annotations to the schema: set readOnlyHint=true and idempotentHint=true for both tools. This signals to agents that these calls are safe to retry without side effects.
• Enhance validate_pine_script description with explicit guidance: 'Call this to check Pine syntax before submission. Returns all errors and warnings visible in the VS Code editor, including semantic checks. Matches editor diagnostics exactly.'
• Add parameter constraints: document that file_path must end in .pine and code must be non-empty UTF-8 string. Consider adding a maxLength constraint to code (e.g., 1MB) to prevent abuse.
• Improve error messages with recovery hints. Instead of 'Cannot read /path/to/file: ENOENT', return 'File not found: /path/to/file. Check the path and try again, or pass the Pine code directly via the code parameter.'