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ZennoBrowser MCP Server

Official

Deletes a preset.

delete_preset
DestructiveIdempotent

Deletes a saved browser preset by its preset ID, optionally within a workspace. Use to remove obsolete presets and keep ZennoBrowser profile configurations clean.

Instructions

Deletes a preset.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
presetIdYesTarget preset ID
workspaceIdNoWorkspace ID. Use -1 for the default workspace

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.2/5.0
Behavior2/5

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

Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description adds nothing beyond that — no statement of irreversible loss, no cascade effects, no confirmation requirements — so it exceeds the minimum but contributes no behavioral context.

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

Conciseness2/5

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

The single sentence is short and front-loaded, but it restates the name rather than conveying information, so it does not earn its place. This is under-specification rather than genuine conciseness.

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 delete tool with no output schema, the description omits what an agent needs: whether deletion is recoverable, whether the preset must be unused, and how workspaceId scopes the target. Annotations cover the write/destructive profile but not the operational context.

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%: presetId and workspaceId are both documented in the schema, including the -1 default workspace convention. The description adds no 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.

Purpose2/5

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

Tautological: description restates name/title.

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 when-to-use guidance, no mention of prerequisites, and no reference to alternatives such as create_preset, get_presets, or bulk_update_profile_preset. The agent must infer entirely from the tool name.

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