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pwndbg_unsortedbin

Display freed chunks in the unsorted bin of a glibc heap arena to identify potential exploit targets.

Instructions

Print the contents of an arena's unsorted bin.

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

The unsorted bin is a doubly-linked list where freed chunks go before being sorted into small/large bins. A key target for heap exploits.

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
Behavior2/5

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

No annotations are provided, and the description only says 'Print the contents' without disclosing whether the tool modifies state or has any side effects. For a read-only command, this is a significant gap.

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

Conciseness4/5

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

The description is concise with a clear first sentence. The inclusion of a URL may be unnecessary but does not hinder understanding. It is appropriately sized.

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?

The description covers purpose and parameters adequately, but lacks behavioral transparency. An output schema exists, so return values are not a concern. Overall, it is complete enough for a simple print tool but could be improved.

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?

The description explains all three parameters: session_id is a UUID, addr is optional arena address, verbose shows extended details. This adds meaning beyond the schema, which only provides names and types.

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 the tool prints the contents of an arena's unsorted bin, using a specific verb and resource. It distinguishes itself from sibling tools like pwndbg_fastbins and pwndbg_smallbins by focusing on the unsorted bin.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides context that the unsorted bin is a key target for heap exploits, implying when to use it. While it does not explicitly state when not to use this tool or name alternatives, the context is sufficient for an agent familiar with heap debugging.

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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