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OpenSIPS

OpenSIPS MCP Server

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by OpenSIPS

sip_options_ping

Send SIP OPTIONS probes to a target host and report response codes and round-trip time to verify reachability from the MCP host.

Instructions

Send SIP OPTIONS probes to target and report response codes / RTT.

Pure Python UDP implementation — no external sipsak / sipp needed. Useful for "can the MCP host even reach this next-hop?" checks.

Parameters

target: host[:port]. Port defaults to 5060. count: Number of probes. Clamped to 1..20. timeout_sec: Per-probe response timeout. Clamped to 0.2..10. from_uri: SIP From URI. Default is a clearly synthetic probe identity so the receiving endpoint can filter it out of real traffic analysis. allow_public: Must be True to target a public IP. Prevents accidental probing of production carriers from a misconfigured MCP.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetYes
countNo
timeout_secNo
from_uriNosip:probe@opensips-mcp.local
allow_publicNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

With no annotations, the description carries the burden and discloses multiple behavioral traits: pure Python UDP, clamping of count and timeout, synthetic default from_uri, and the allow_public safety guard. It does not detail error handling but covers key behaviors.

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 concise: a one-line purpose, a line about implementation, a usage sentence, and a parameter table. Every sentence is relevant and front-loaded. 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 an output schema exists (not shown), the description does not need to explain return values. It covers the tool's purpose, parameters, and key behaviors. Minor gap: no mention of read-only nature, but it's implicit.

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

Parameters5/5

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

Schema coverage is 0%, so the description fully compensates. It explains target format and default port, count clamping (1-20), timeout clamping (0.2-10), the purpose of from_uri, and the safety intention of allow_public. This adds critical meaning beyond the schema.

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 action ('Send SIP OPTIONS probes') and the resource (target), and distinguishes from sibling tools like sipp_load_test by emphasizing it's a simple UDP implementation without external dependencies.

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 explicitly mentions a use case ('can the MCP host even reach this next-hop?') and notes it's a pure Python implementation, implying when to use it. However, it does not provide explicit alternatives or when-not-to-use guidance.

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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