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pwndbg_tcachebins

Print tcache free list chains per size class for GLibc heap analysis, revealing bin entries at a given address.

Instructions

Print tcache bin entries (free list chains per size class).

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

Args: session_id: The UUID of the session. addr: Optional tcache 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 provided, so description must disclose behavior. It only states 'Print', which implies read-only, but does not explicitly confirm no side effects, required permissions, or performance impact. The lack of behavioral transparency is a 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 well-structured with a clear first line, source info, and parameter list. It is slightly verbose with a code block, but remains efficient. The link provides optional depth.

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 tool has an output schema (not shown), so return values need not be detailed. The description covers what is printed (tcache bin entries per size class). However, the absence of example output or format details leaves some ambiguity, though the link helps.

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?

With schema description coverage at 0%, the description's Args section adds essential meaning: session_id is a UUID, addr is optional tcache address, verbose shows extended details. This adds value beyond schema property names, though descriptions are brief.

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 tcache bin entries, specifically free list chains per size class. This verb-resource pair is specific and distinguishes it from sibling tools like pwndbg_bins or pwndbg_fastbins.

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?

No explicit guidance on when to use this tool versus alternatives. Given siblings like pwndbg_tcache and general bin tools, the description should indicate the context (e.g., analyzing tcache free lists) but does not.

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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