Clientcast has well-structured Zod schemas and clear tool names following verb_noun convention (client_init, client_send, client_status, client_list, client_export). However, parameter descriptions are entirely missing, the Zod schemas define types but the source shows no descriptions attached to individual parameters. Tool descriptions are present but brief (34 - 72 chars), below the 194-char baseline for production tools. Output schemas are not documented. Error handling returns JSON with ok/error fields but lacks recovery guidance or actionable next steps. No tool annotations (readOnlyHint/destructiveHint) despite clear risk levels (WRITE vs READ_ONLY). The server is functional but lacks the LLM-optimization depth expected of A-grade tools.

• Add descriptions to every Zod schema field. Example: 'since: z.string().optional().describe("Git ref or timestamp to fetch commits since (e.g. HEAD~5, 2024-01-15). Defaults to last update.")'. This makes parameter intent explicit to LLMs.
• Expand tool descriptions to 150 - 250 chars. Include WHAT, WHEN, and WHAT IT RETURNS. Example for client_send: 'Generate a client update from recent git commits since a specified ref. Analyzes diffs, estimates scope-creep costs, and uploads to a shareable URL. Use dryRun=true to preview without uploading. Returns updateId, url, and commit count.'
• Document output schemas in tool descriptions or as a separate schema field. Example: 'Returns {ok: boolean, updateId: string, url: string, commitsCount: number, preview: string}'. This enables LLMs to chain tools and extract fields reliably.
• Add tool annotations to server.ts tool definitions. Mark client_init and client_send with destructiveHint: true. Mark client_status, client_list, client_export with readOnlyHint: true. This signals to agents which operations are safe to retry.
• Enhance error messages with recovery paths. Instead of 'Project not initialized', return 'Project not initialized. Run client_init(projectName, clientName, clientEmail, hourlyRate) first.' This guides agents to self-correct without extra discovery calls.