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    MCP Server Builder — Production Tool Contracts, Gates & Security Plan

    1

    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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    MCP Server Builder — Production Tool Contracts, Gates & Security Plan

    MCP Server Builder — Production Tool Contracts, Gates & Security Plan

    Example session with this skill installed

    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

    • Read your context and instructions
    • Compiled the mcp server builder

    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

    Connects securely to your tools. The creator never sees your data.

    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.

    Find more skills like this on the Claude Skills Marketplace, the Codex Skills Marketplace and the Gemini Skills Marketplace, or browse Claude Skills for LLM Ops.

    • Design and spec only — not a running or deployed server
    • Target API schemas are placeholders until you provide real OpenAPI/types
    • Not for MCP client config files alone
    • Not a runtime security certification
    • Does not implement language-specific server code unless you ask separately

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before buying a skill.

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    Fresh listing

    Recently published to Agensi

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    Trust & safety

    Security scan

    Security scan passed 20 days ago

    Permissions

    Read Files

    This skill only produces an MCP design document and JSON from the capability you describe. It does not install packages, start a server, call your APIs, or read secrets from the environment. Grant Read only; leave Shell, Write, Browser, Network, and Env off.

    Listed3 months ago

    What's inside

    Frequently Asked Questions

    This skill functions as a high-level architect for Model Context Protocol (MCP) servers, transforming vague capabilities into production-grade tool definitions with strict JSON schemas, risk classifications, and security gates before you write any code.

    The skill is designed for any MCP-compliant host, including Claude Code, Cursor, and Windsurf, and supports both stdio and HTTP-SSE transport layers.

    The skill classifies every tool into risk tiers (Read-only, Mutating, or External-Sideeffect) and prescribes mandatory approval gates and idempotency logic for any operation that is irreversible or high-impact.

    No, this skill is a design and blueprinting tool; it produces the technical contracts and security plans needed for implementation without requiring access to your live databases or deployment environments.

    You receive a complete implementation blueprint including atomic tool contracts, agent-facing descriptions, JSON schemas, a multi-layer security plan, and a final 'Ready-to-Implement' or 'Block' verdict.

    New in LLM Ops