Decompress Binary

What it does

When your agent uses it

• Gdb/lldb needs real symbols from a downloaded CI/release binary
• Self-extraction by running the binary is not possible because of an architecture mismatch

Example prompts

• “/decompress-binary”

Requirements

• Python 3
• Pre-approved tools (allowed-tools): Bash(python3:*), Bash(zstd:*), Bash(llvm-objdump:*), Bash(llvm-nm:*), Bash(file:*), Bash(curl:*), Bash(ls:*), Bash(stat:*), Read, Write

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

1. 1Download the binary from the build job for the exact commit, for example
2. 2Extract the inner ELF
3. 3Verify it is the right build and has symbols
4. 4Use it with the core dump

What it can do on your machine

Read from SKILL.md and the folder at commit cd023af. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash(python3:*)
  • Bash(zstd:*)
  • Bash(llvm-objdump:*)
  • Bash(llvm-nm:*)
  • Bash(file:*)
  • Bash(curl:*)
  • Bash(ls:*)
  • Bash(stat:*)
  • Read
  • Write

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships script files (Python), which the agent can run.

  Shell commands in SKILL.md call:

  • curl
  • python3

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • clickhouse-builds.s3.amazonaws.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Decompress Binary loads about 1.1k tokens when it runs. Until then it costs about 96 tokens; SKILL.md has 417 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~96

When it runs · the whole SKILL.md, loaded when a task matches

~1.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from ClickHouse/ClickHouse at commit cd023af, republished under its Apache-2.0 licence (© ClickHouse). 417 words, ~1,106 tokens.

name

decompress-binary

description

Extract the inner ELF from a ClickHouse self-extracting `clickhouse` binary, including when its architecture differs from the host (e.g. to load an aarch64 CI core dump on an x86 workstation). Use when gdb/lldb needs real symbols from a downloaded CI/release binary, or when self-extraction by running the binary is not possible because of an architecture mismatch.

allowed-tools

Bash(python3:*), Bash(zstd:*), Bash(llvm-objdump:*), Bash(llvm-nm:*), Bash(file:*), Bash(curl:*), Bash(ls:*), Bash(stat:*), Read, Write

argument-hint

<clickhouse-self-extracting> [output.elf]

disable-model-invocation

false

[ decompressor ELF ]
[ compressed file blobs ]
[ FileData[] ]                 # one per packed file, each followed by its name
[ MetaData (16 bytes) @ EOF ]

MetaData { uint64 number_of_files; uint64 start_of_files_data; }
FileData { uint64 start, end, name_length, uncompressed_size, umask; bool exec; }

© ClickHouse, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in .claude/skills/decompress-binary of ClickHouse/ClickHouse.

• SKILL.md
• extract_self_extracting.py

Open the folder on GitHubat commit cd023af