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MCP Server Builder — Production Tool Contracts, Gates & Security Plan
by Vivek K
Designs a production-grade MCP server: atomic tools, full contracts, risk classes, approval gates, idempotency, discoverability, and a READY-TO-IMPLEMENT / HARDEN-FIRST / BLOCK verdict — without deploying anything.
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You say
Capability: MCP for multi-tenant feature flags (FlagBridge / OpenFeature-style) Agents: Cursor + Claude Code over stdio Ops: list, get, evaluate, create, set_enabled, delete Constraints: hard approval for production toggles + deletes; no secrets in repo
Your agent does
Server: flagbridge-mcp Verdict: HARDEN-FIRST Tools: 6 (3 read-only / 2 mutating / 1 external)
- list/get/evaluate → READ-ONLY, no gate
- create_feature_flag → MUTATING, confirm + idempotency_key
- set_flag_enabled → hard-approval for production
- delete_feature_flag → EXTERNAL, hard-approval + confirm_key Findings: align OpenAPI; wire runtime prod approvals; clarify tenant scope JSON: full contracts + security_plan + readiness_findings
What you get
About this skill
The problem
- MCP tools are often thrown together as mega-tools with vague names — agents mis-invoke them or skip them.
- Mutating and irreversible operations ship without approval gates or idempotency.
- Security (least privilege, injection, secrets) is bolted on after the first incident.
What it does
- Decomposes a capability into atomic tools with clear verb_noun names.
- Writes a full contract per tool: agent-facing description, input JSON schema, output shape, error cases.
- Classifies risk: READ-ONLY, MUTATING, or EXTERNAL-SIDEEFFECT.
- Designs approval gates and idempotency for dangerous tools.
- Produces a security plan and a readiness verdict: READY-TO-IMPLEMENT, HARDEN-FIRST, or BLOCK.
Frameworks & tools
- Model Context Protocol servers for Claude Code, Cursor, and other MCP hosts (stdio or HTTP-SSE).
- Works against databases, internal REST APIs, filesystems, or third-party services you describe.
- No live connection required for the design step — optional schemas improve precision.
Why this beats prompting it yourself
- Risk-driven gates (hard-approval for irreversible/external ops) instead of ad-hoc tool lists.
- Discoverability rules so agents pick the right tool from name + description.
- MCP-specific injection defense (tool descriptions and outputs).
- Deterministic readiness gate with explicit findings — not “looks fine.”
- Never embeds real secrets; design only, no deploy.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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