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sfncat

Joern MCP Server

by sfncat
OverviewSchemaRelated ServersScoreDiscussions
Python
Local

ping

Check if the Joern server is running and responsive by querying its version, returning the version if successful or 'Query Failed' if not responding.

Instructions

Checks if the Joern server is running and responsive by querying its version

@return: The Joern server version if successful, 'Query Failed' if the server is not responding

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • server_tools.py:9-19 (handler)
    The 'ping' tool handler function. It sends a 'version' query to the Joern server via joern_remote, extracts the value if successful, otherwise returns 'Query Failed'. Registered via @joern_mcp.tool() decorator.
    @joern_mcp.tool()
def ping()->str:
    """Checks if the Joern server is running and responsive by querying its version
    
    @return: The Joern server version if successful, 'Query Failed' if the server is not responding
    """
    response = joern_remote('version')
    if response:
        return extract_value(response)
    else:
        return 'Query Failed'

Tool Definition Quality

A4.4/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes the tool's behavior: it performs a health check by querying the server version, and specifies the possible return outcomes (version string on success, 'Query Failed' on failure). This covers the core behavioral traits without contradiction.

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 extremely concise and front-loaded, consisting of just two sentences that directly explain what the tool does and what it returns. Every sentence adds essential value with zero wasted words, making it highly efficient and well-structured.

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 tool's simplicity (0 parameters, no annotations, no output schema), the description is nearly complete. It explains the purpose, behavior, and return values adequately. However, it could slightly improve by mentioning any prerequisites (e.g., network connectivity) or error details beyond 'Query Failed', but this is minor for such a straightforward tool.

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

Parameters4/5

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

The tool has 0 parameters with 100% schema description coverage, so the schema fully documents the absence of inputs. The description appropriately does not discuss parameters, maintaining focus on the tool's purpose and behavior. This meets the baseline of 4 for zero-parameter tools.

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 specific action ('checks if the Joern server is running and responsive') and the resource being accessed ('by querying its version'). It distinguishes itself from sibling tools like 'check_connection' by specifying the version query aspect, making the purpose explicit and differentiated.

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

Usage Guidelines4/5

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

The description implies usage context (to verify server responsiveness), but does not explicitly state when to use this tool versus alternatives like 'check_connection' or other diagnostic tools. It provides clear context for its purpose but lacks explicit exclusions or named alternatives.

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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