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@arizeai/phoenix-mcp

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by Arize-ai

get-latest-prompt

Retrieve the latest version of a prompt, including its template, model configuration, and invocation parameters.

Instructions

Get the latest version of a prompt. Returns the prompt version with its template, model configuration, and invocation parameters.

Example usage: Get the latest version of a prompt named 'article-summarizer'

Expected return: Prompt version object with template and configuration. Example: { "description": "Initial version", "model_provider": "OPENAI", "model_name": "gpt-3.5-turbo", "template": { "type": "chat", "messages": [ { "role": "system", "content": "You are an expert summarizer. Create clear, concise bullet points highlighting the key information." }, { "role": "user", "content": "Please summarize the following {{topic}} article:\n\n{{article}}" } ] }, "template_type": "CHAT", "template_format": "MUSTACHE", "invocation_parameters": { "type": "openai", "openai": {} }, "id": "promptversionid1234" }

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
prompt_identifierYes
Behavior3/5

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

With no annotations, the description carries the full burden. It explains the return structure with a detailed example (template, model config, invocation parameters). However, it does not state any potential errors, authentication requirements, or what happens if no versions exist. The read-only nature is implied but not explicit.

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

Conciseness3/5

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

The description is front-loaded with purpose, followed by a useful example. However, the example is verbose and could be shortened while retaining clarity. Some sentences could be trimmed without losing meaning.

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?

Given the lack of output schema and low schema coverage, the description should provide more completeness. It fails to describe the parameter semantics fully, and does not clarify how 'latest' is determined (e.g., by creation date). Missing details about ordering or error cases.

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?

Schema coverage is 0%, so the description must compensate. The only parameter, 'prompt_identifier', is not described explicitly. The example uses a prompt name, suggesting it is an identifier, but no clarification on format (name vs ID) or source. Partial compensation but inadequate.

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 action ('get the latest version') and resource ('prompt'). The name 'get-latest-prompt' and example usage with a prompt name make the purpose unambiguous. However, it does not explicitly distinguish from sibling tools like get-prompt-version, which retrieve specific versions; the distinction is implied by the word 'latest'.

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?

The description provides no guidance on when to use this tool versus alternatives. It does not mention that this is for retrieving the most recent version, while get-prompt-version or get-prompt-version-by-tag are for specific versions. No 'when to use' or 'when not to use' information.

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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