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Arize-ai

@arizeai/phoenix-mcp

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by Arize-ai

get-session

Retrieve a single session by GlobalID or a user-defined session ID, with the option to include annotations.

Instructions

Get a single session by GlobalID or user-provided session_id.

Example usage: Show me session "chat-123"

Expected return: A session object and, optionally, its annotations.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_identifierYes
include_annotationsNo
Behavior3/5

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

No annotations are present, so the description itself must convey behavior. It states it returns a session object and optionally annotations, implying a read operation, but lacks details on side effects, authentication, or rate limits.

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 short and includes an example and expected return, but the structure could be improved with bullet points or clearer separation.

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

Completeness3/5

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

The description adequately defines the tool's input and output for a simple get operation, but without an output schema, more detail on the session object structure would be helpful.

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

Parameters2/5

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

The description adds meaning for 'session_identifier' (by GlobalID or session_id) but does not mention 'include_annotations', leaving its purpose unclear. With 0% schema coverage, this is a significant gap.

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 single session by ID, distinguishing it from list-sessions and other get tools. However, it does not explicitly name alternatives.

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

Usage Guidelines3/5

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

Example usage provides a hint, but there is no explicit guidance on when to use this tool versus list-sessions or other tools, nor any prerequisites.

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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