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avivsinai

langfuse-mcp

list_dataset_run_items

Retrieve items from a dataset run by specifying dataset ID and run name, with pagination and output format options.

Instructions

List dataset run items by dataset ID and run name.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pageNoPage number for pagination (starts at 1)
limitNoItems per page (max 100)
run_nameYesDataset run name to list items from
dataset_idYesDataset ID that owns the run items
output_modeNoOutput format: 'compact' truncates, 'full_json_string' returns full data, 'full_json_file' writes to filecompact

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations, the description fails to disclose key behavioral traits such as read-only nature, pagination behavior, or output mode implications. The agent cannot tell if this operation is safe or if it triggers side effects.

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 a single concise sentence with no wasted words. However, it lacks structure or front-loading of critical information that would help an agent quickly assess relevance.

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?

Given the tool has 5 parameters and an output schema, the description is underspecified. It omits pagination limits, output mode details, and use case context (e.g., listing items for review or export), making it only moderately complete.

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 description coverage is 100%, so the input schema already documents all parameters. The description adds no additional meaning or context beyond the schema, meeting the baseline but not exceeding it.

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 it lists items from a dataset run, specifying the two key identifiers (dataset ID and run name). However, it does not differentiate from similar siblings like list_dataset_items or list_dataset_runs, which could cause confusion for an agent.

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?

No guidance is provided on when to use this tool versus alternatives (e.g., list_dataset_items, list_dataset_runs), nor any prerequisites or exclusion criteria. The agent must infer usage from the name alone.

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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