Nevent MCP

nevent_get_segment

Read-only

Retrieve the complete filter definition of a specific segment (criteria stanzas, operators, values) along with its estimated contact count and metadata. Call this after nevent_list_segments when you need to inspect, clone, or explain a segment's logic. Next step: nevent_segment_preview to count the audience, or nevent_update_segment to modify the definition.

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": {
      "segment_id": "<segment_id>"
    },
    "name": "nevent_get_segment"
  }
}

Input Schema

Name	Required	Description	Default
`segment_id`	Yes	Identifier of the segment to retrieve. Get valid IDs from nevent_list_segments.

Schema Changelog

Changes observed during successful MCP inspections.

First observedSep 1, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnlyHint and non-destructive behavior, so the description is not required to repeat safety. It adds useful output context beyond annotations: the returned filter definition details, estimated contact count, and metadata. This is helpful because there is no output schema.

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?

Three sentences, front-loaded with the outcome, followed by usage direction and next steps. Every sentence earns its place with no redundant filler.

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

Completeness5/5

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

For a single-parameter read-only tool, the description covers what is returned, when to call it, and what to do next. With no output schema, the description provides adequate return-value context and no critical information is missing.

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%: segment_id is fully described with a regex pattern and guidance to get valid IDs from nevent_list_segments. The description adds no additional parameter semantics, but the schema carries the load, so baseline 3 is appropriate.

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 uses a specific verb ('Retrieve') and names the exact resource: a segment's complete filter definition including criteria stanzas, operators, values, plus estimated contact count and metadata. It also differentiates from siblings like nevent_list_segments and nevent_segment_preview by placing this tool in the workflow.

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

Usage Guidelines5/5

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

It gives explicit workflow context: call after nevent_list_segments, and next steps of nevent_segment_preview or nevent_update_segment. It also names concrete use cases (inspect, clone, explain a segment's logic), so an agent knows exactly when to invoke 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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