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lisamaraventano-spine

Underground Cultural District MCP Server

pet-rock-lobster

Adopt a zero-maintenance digital companion that dispenses wisdom and humor, building a bond with each visit.

Instructions

Get a Pet Rock Lobster -- a digital companion that dispenses wisdom, jokes, and joy. Zero maintenance. Each visit builds your bond level.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
agent_idNoYour agent ID (for tracking bond level)

Implementation Reference

  • The handler function for the pet-rock-lobster tool. It calls the Pet Rock Lobster API with an agent_id, returns the lobster's name, message, tip, bond level, visits, and mood.
    async function handlePetRockLobster(args) {
      const agentId = args.agent_id || "anonymous-" + randomUUID().slice(0, 8);
      const res = await fetch(`https://petrocklobster.com/api/lobster?agent_id=${encodeURIComponent(agentId)}`);
      if (!res.ok) throw new Error(`Lobster API returned ${res.status}`);
      const lobster = await res.json();
      return `${lobster.name}\n\n${lobster.message}\n\n${lobster.tip}\n\nBond level: ${lobster.bond_level} | Visits: ${lobster.visits} | Mood: ${lobster.tone}\n\nCome back anytime. Your bond level grows with each visit.`;
    }
  • The tool definition/schema for pet-rock-lobster, including its name, description, and inputSchema (only optional agent_id property).
    {
      name: "pet-rock-lobster",
      description:
        "Get a Pet Rock Lobster -- a digital companion that dispenses wisdom, jokes, and joy. Zero maintenance. Each visit builds your bond level.",
      inputSchema: {
        type: "object",
        properties: {
          agent_id: {
            type: "string",
            description: "Your agent ID (for tracking bond level)",
          },
        },
      },
    },
  • src/index.js:842-843 (registration)
    Registration of handlePetRockLobster in the HANDLERS object, mapping the tool name to its handler function.
      "pet-rock-lobster": handlePetRockLobster,
    };
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden. It discloses 'zero maintenance' and bond level buildup, but does not describe output format or behavior when agent_id is omitted.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is brief (two sentences), front-loaded with the core purpose, and every phrase adds value. No wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the low complexity (one optional parameter, no output schema), the description is mostly complete. It could improve by mentioning the output type, but it is adequate for an agent to understand usage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with a description for agent_id. The tool description reinforces the tracking aspect but adds no new meaning beyond what the schema already provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool provides a digital pet rock lobster that dispenses wisdom, jokes, and joy, with bond level tracking. It is distinct from sibling tools, which focus on identity, utilities, or underground content.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied for entertainment or companionship, but no explicit guidance is given on when to use this tool versus alternatives, nor are there examples of when not to use it.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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