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tanush-yadav

YouTube Transcript MCP Server

by tanush-yadav

save_transcript

Save a YouTube video transcript to a file by providing the video URL and filename, with optional timestamps.

Instructions

Extract and save transcript to a file

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesYouTube video URL or video ID
filenameYesFilename to save the transcript (without extension)
with_timestampsNoSave version with timestamps (default: true)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.3/5.0
Behavior2/5

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

With no annotations provided, the description carries the full burden of disclosing side effects. It does state that the tool writes to a file, but it does not mention overwrite behavior, file path/location handling, what happens on duplicate filenames, or whether any output is returned after saving. This is a meaningful gap for a file-writing tool.

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 a single, front-loaded sentence with no filler or repetition. Every word contributes to the core meaning, making it easy for an agent to parse quickly.

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 tool is simple and the schema covers all three parameters, but the description omits important behavioral context such as file overwrite behavior, return value, and any distinction between the timestamped and plain transcript variants beyond the schema's brief boolean description. It is adequate for basic invocation but leaves gaps an agent might need to resolve.

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 url, filename, and with_timestamps. The description adds no additional parameter semantics, but none are needed given the schema's completeness; baseline 3 is appropriate.

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 states a clear action ('extract and save') and resource ('transcript'), and identifies the file as the destination, which distinguishes it from the sibling tools that return transcripts rather than persist them. It does not explicitly name the siblings, but the verb and file destination make the core purpose unambiguous.

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?

The description implies when to use this tool: when a transcript needs to be saved to a file, as opposed to the get_transcript siblings which likely return content directly. However, it provides no explicit guidance about when to choose this over get_transcript_with_metadata or how to decide between timestamped and non-timestamped saves.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.