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MCP Helius

MCP Helius

by dcSpark
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Remote

helius_get_priority_fee_estimate

Estimate priority fees for Solana transactions by specifying account keys and priority level, helping select optimal fee for desired confirmation speed.

Instructions

Get priority fee estimate for a transaction

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "helius_get_priority_fee_estimate"
  }
}

Input Schema

NameRequiredDescriptionDefault
accountKeysNo
optionsNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, and the description does not disclose behavioral traits such as whether the tool is read-only, requires authorization, or has side effects. The description simply states the purpose, leaving the agent to infer behavior.

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

Conciseness4/5

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

The description is a single, efficient sentence with no redundancy. However, it may be too brief given the complexity of the tool.

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?

With 2 parameters (one nested with enum), no output schema, and no annotations, the description is insufficient. It does not explain return values, parameter formats, or how the estimate is computed, leaving major gaps for the agent.

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

Parameters1/5

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

The input schema has 0% description coverage, and the description adds no explanation for parameters. It does not clarify what 'accountKeys' represents or how 'options' affect the estimate. The agent receives no additional meaning beyond parameter names.

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 tool retrieves a 'priority fee estimate for a transaction', but it does not differentiate from sibling tool 'helius_get_fee_for_message' which also deals with fees. Slightly vague, but still specific enough.

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 'helius_get_fee_for_message' or other fee-related tools. The description lacks context about prerequisites or scenarios.

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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