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pwndbg_hi

Displays heap chunk details including bin membership, neighbors, and allocation status for a given address. Useful for analyzing GLibc heap structures.

Instructions

Display heap information for a specific chunk address.

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

Shows which bin a chunk belongs to, its neighbors, and allocation status.

Args: session_id: The UUID of the session. addr: Address of the chunk. verbose: If True, show extended details.

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

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYes
addrYes
verboseNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

Describes what the tool shows (bin, neighbors, status) but lacks details on prerequisites (e.g., heap initialization), side effects, or error behavior. No annotations provided to fill this 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?

Front-loaded with purpose, then supporting details. Could omit source URL and category for brevity, but remains clear and efficient.

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?

Covers key output (bin, neighbors, status) but does not describe return format, possible errors, or required session state. Adequate for a simple tool but not comprehensive.

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?

Despite 0% schema coverage, the description explains each parameter's purpose (session_id, addr, verbose), adding value 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?

Clearly states the tool displays heap information for a specific chunk address, including bin, neighbors, and status. Distinguishes from sibling heap tools that list multiple chunks or bins.

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?

Implicitly suggests use when you have a specific chunk address, but no explicit when-to-use or alternatives compared to siblings like pwndbg_bins or pwndbg_vis_heap_chunks.

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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