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pwndbg_smallbins

Print the contents of small bins from a GLibc arena to inspect sorted free chunks by size.

Instructions

Print the contents of an arena's small bins.

pwndbg command: smallbins Source: pwndbg/commands/ptmalloc2.py Category: GLibc ptmalloc2 Heap

Small bins hold chunks from 0x20 to 0x3F0 bytes (64-bit) in doubly-linked lists sorted by size.

Args: session_id: The UUID of the session. addr: Optional arena address. verbose: If True, show extended details.

See: https://pwndbg.re/2025.05.30/reference/pwndbg/commands/ptmalloc2/

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYes
addrNo
verboseNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations exist, so the description carries the full burden. It states 'Print' indicating read-only operation but does not explicitly confirm no side effects or describe what happens with missing addr. Lacks details on permissions or output format.

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 well-structured with a summary line, metadata, explanatory note, parameter list, and reference link. Every sentence serves a purpose with no redundancy.

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 an output schema exists, return values need not be explained. The description covers purpose, size range, and parameters. Minor gap: no explanation of default when addr is omitted. Overall adequate for a printing tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, but the description provides descriptions for all three parameters (session_id as UUID, addr as optional arena, verbose as extended details). These add meaning beyond the schema titles.

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 clearly states 'Print the contents of an arena's small bins' with a specific verb and resource. It explains that small bins hold chunks from 0x20 to 0x3F0 bytes, distinguishing it from siblings like pwndbg_fastbins, pwndbg_largebins, etc.

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?

The description provides context about small bins' size range but no explicit guidance on when to use this tool vs alternatives like pwndbg_bins or pwndbg_fastbins. There are no when-not or alternative mentions.

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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