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ZennoBrowser MCP Server

ZennoBrowser MCP Server

Official
by ZennoLab
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Deletes an existing browser profile.

delete_profile
DestructiveIdempotent

Deletes an existing browser profile by its unique profile ID, optionally within a specified workspace, to remove unused or obsolete profiles.

Instructions

This method deletes an existing browser profile.

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": {
      "profileId": "<profileId>"
    },
    "name": "delete_profile"
  }
}

Input Schema

NameRequiredDescriptionDefault
profileIdYesUnique identifier of the profile to delete (required).
workspaceIdNoWorkspace identifier. -1 means the default workspace.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.5/5.0
Behavior2/5

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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered. The description adds nothing beyond them: it does not say whether deleted profile data (cookies, extensions, fingerprints) is unrecoverable, whether recover_profile can undo it, or what happens to associated resources.

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?

It is a single short sentence with no padding, which is good, but it merely duplicates the title word for word and therefore does not earn its place as added information.

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?

For a destructive mutation tool with no output schema, the description should at minimum cover consequences and recovery options. With annotations covering only the generic safety hints, an agent is left without the deletion semantics it needs to call this responsibly.

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%, with both profileId and workspaceId (including the -1 default meaning) documented in the schema. The description contributes no additional parameter meaning, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource ('deletes an existing browser profile'), so the purpose is not vague. However, it is a verbatim restatement of the title and offers no differentiation from siblings such as bulk_delete_profile, delete_profile_folder, or recover_profile.

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?

There is no guidance on when to use this tool versus bulk_delete_profile for multiple profiles, nor any prerequisites such as required permissions or whether the profile must be stopped first. The 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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