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Pump.fun MCP Server

Pump.fun MCP Server

by noahgsolomon
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

buy-token

Purchase tokens on the Pump.fun platform via the Solana blockchain. Input the token address, buy amount in SOL, account name, and slippage tolerance to execute the transaction.

Instructions

Buy a Pump.fun token

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "tokenAddress": "<tokenAddress>",
      "buyAmount": "<buyAmount>"
    },
    "name": "buy-token"
  }
}

Input Schema

NameRequiredDescriptionDefault
accountNameNoName of the account to usedefault
buyAmountYesAmount to buy in SOL
slippageBasisPointsNoSlippage tolerance in basis points (1% = 100)
tokenAddressYesThe token's mint address

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.9/5.0
Behavior2/5

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

With no annotations, the description carries full burden but only states the action without disclosing behavioral traits like required permissions, transaction costs, rate limits, or what happens on failure. 'Buy' implies a financial transaction, but critical details like confirmation steps or irreversible effects are missing.

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 a single, efficient sentence with zero waste, front-loading the core action. It's appropriately sized for the tool's complexity, making it easy to parse quickly.

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

Completeness2/5

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

Given no annotations, no output schema, and a financial transaction tool with 4 parameters, the description is incomplete. It lacks essential context like return values, error handling, or behavioral nuances, leaving significant gaps for safe and effective use.

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 description coverage is 100%, so parameters are well-documented in the schema. The description adds no additional meaning beyond implying token purchase, which aligns with schema but doesn't enhance understanding of parameter interactions or usage context.

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

Purpose4/5

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

The description clearly states the action ('buy') and resource ('a Pump.fun token'), providing specific purpose. However, it doesn't differentiate from sibling 'sell-token' beyond the verb direction, missing explicit distinction about when each is appropriate.

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

Usage Guidelines2/5

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

No guidance on when to use this tool versus alternatives like 'sell-token' or 'create-token' is provided. The description assumes context but offers no explicit usage context, prerequisites, or exclusions.

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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