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interceptor_browser_list_storage_keys

List localStorage or sessionStorage keys for the current origin, with pagination, key filtering, and truncated value previews.

Instructions

List localStorage/sessionStorage keys for the current origin with pagination and truncated value previews.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMax items to return (default: 50, max: 500)
offsetNoOffset into results (default: 0)
originNoOptional origin override (must match current page origin)
target_idYesTarget ID from interceptor_browser_launch
key_filterNoFilter by key substring
storage_typeYesStorage type
value_max_charsNoMax characters for storage value previews (default: 256)

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv3.5.3
    • changedInput schema / properties / target_id / description
      Previous value: -"Target ID from interceptor_browser_launch or interceptor_camoufox_launch"New value: +"Target ID from interceptor_browser_launch"
  2. Changed1 schema field changedv3.3.1
    • changedInput schema / properties / target_id / description
      Previous value: -"Target ID from interceptor_browser_launch"New value: +"Target ID from interceptor_browser_launch or interceptor_camoufox_launch"
  3. Addedv2.3.0

TDQS

A3.8/5.0
Behavior3/5

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

No annotations provided, so the description must bear the full burden. It discloses read-only behavior and the truncation feature but omits potential errors, permission requirements, or performance impact. Schema already covers parameters.

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?

Single sentence that efficiently conveys the core purpose and key features. No redundant or extraneous information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given 7 parameters and no output schema, the description explains the main goal (list keys with truncated values) but does not specify the output format (e.g., list of key-value objects). However, the schema and inference from similar tools fill most gaps.

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 coverage is 100%, so baseline is 3. The description adds a summary of pagination and truncation, but does not provide additional meaning beyond what the schema already describes for each 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 explicitly states the action (list), resource (localStorage/sessionStorage keys), context (current origin), and notable features (pagination, truncated value previews). It clearly distinguishes from sibling tools that get a single value or list other storage types.

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?

No explicit guidance on when to use this tool versus alternatives like interceptor_browser_get_storage_value. The schema implies a prerequisite (target_id from interceptor_browser_launch) but the description does not mention it.

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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