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pwndbg_commpage

Dump kernel-provided data from the macOS commpage, including CPU features and timestamps, without system calls.

Instructions

Dump values from the macOS commpage.

pwndbg command: commpage Source: pwndbg/commands/commpage.py Category: Darwin/libsystem/Mach-O

The commpage is a shared memory page on macOS that contains kernel-provided data accessible from userspace without syscalls (CPU features, timestamps, etc.).

Args: session_id: The UUID of the session. verbose: If True, show all commpage fields.

See: https://pwndbg.re/2025.05.30/reference/pwndbg/commands/commpage/

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYes
verboseNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations provided, so description must carry full burden. It describes the action as 'dump' (read-only) but does not explicitly state non-destructive behavior or permissions. Does not mention error behavior or prerequisites.

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?

Description is short, front-loaded with purpose, and includes essential background in a structured format. No wasted sentences.

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?

Given existence of output schema, return values need not be described. However, lacks platform-specific prerequisites (e.g., macOS only) and conditions for error. Adequate but could be more comprehensive.

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?

With 0% schema description coverage, compensation is needed. Description explains session_id and verbose, but session_id lacks details on format or source. Verbose is clear. Provides basic meaning but not rich context.

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?

Description clearly states 'Dump values from the macOS commpage', specifying a specific verb and resource. It distinguishes from siblings like pwndbg_arena which dumps heap arena info.

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?

Provides context on what the commpage is but lacks explicit when-to-use or when-not-to-use guidance. No mention of alternatives, though siblings are distinct.

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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