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Fast Browser MCP

Fast Browser MCP

by kqlio67
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

browser_set_download_path

Set the browser's download directory and behavior to control where files are saved and whether downloads proceed without prompts.

Instructions

Set browser download directory and behavior (automatically allow downloads without popup prompt).

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": {
      "download_path": "<download_path>"
    },
    "name": "browser_set_download_path"
  }
}

Input Schema

NameRequiredDescriptionDefault
behaviorNoallow
download_pathYesAbsolute filesystem directory for downloads

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.8.0

TDQS

B3.3/5.0
Behavior2/5

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

No annotations are provided, so the description must carry the full behavioral burden. It discloses that downloads can be automatically allowed without a popup prompt, which is useful, but it omits whether the setting persists, applies to all tabs, requires permissions, or what happens with deny/default behavior. For a mutation tool with zero annotation coverage, this is a significant gap.

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. It states the tool's effect and its most notable behavioral consequence. Every clause earns its place.

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?

For a simple two-parameter setter with no output schema, the description covers the basic purpose and one behavioral effect. However, with no annotations and incomplete parameter documentation, it does not provide enough context about scope, persistence, or behavior enum nuances for an agent to invoke it confidently in all cases.

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 50%: download_path is documented in the schema, while behavior lacks a schema description but has an enum and default. The description clarifies the 'allow' behavior effect, but does not explain 'deny' or 'default' semantics. With borderline coverage, the description adds some value but does not fully compensate for the undocumented behavior parameter.

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 states a specific verb and resource: setting the browser download directory and behavior. It is immediately distinguishable from sibling tools such as browser_upload_file or browser_set_user_agent. An agent can tell exactly what this tool configures.

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 gives no explicit guidance on when to use this tool versus alternatives. It implies a download-configuration use case, but does not state prerequisites, timing, or when-not-to-use conditions. An agent must infer all usage context 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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