Brain Merge

What it does

Example prompts

• “/brain-merge”

Requirements

• Python 3
• Pre-approved tools (allowed-tools): Read, Write, Edit, Bash, Glob, Grep, Agent

What it can do on your machine

Read from SKILL.md and the folder at commit fd5e9a4. 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:

  • Read
  • Write
  • Edit
  • Bash
  • Glob
  • Grep
  • Agent

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • python3
  • rsync
  • git

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

• Network

  No URLs in SKILL.md. Its commands use rsync and git, which can reach the network depending on how they are called.

  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

Brain Merge loads about 1.6k tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 608 words of instructions outside code blocks.

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

~51

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

~1.6k

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

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Read, Write, Edit, Bash, Glob, Grep, Agent

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 Abilityai/cornelius at commit fd5e9a4, republished under its MIT licence (© Abilityai). 608 words, ~1,625 tokens.

name

brain-merge

description

Compare and selectively merge Brain directories across any two agent instances. Supports diff (see what's unique where), pull (import from another brain), and learn (bidirectional exchange).

allowed-tools

Read, Write, Edit, Bash, Glob, Grep, Agent

automation

gated

user-invocable

true

find . -maxdepth 3 -name "Brain" -type d 2>/dev/null | sort

SOURCE="[SOURCE_BRAIN_PATH]"
TARGET="[TARGET_BRAIN_PATH]"

find "$SOURCE" -name "*.md" | sed "s|$SOURCE/||" | sort > /tmp/brain_source.txt
find "$TARGET" -name "*.md" | sed "s|$TARGET/||" | sort > /tmp/brain_target.txt

echo "Source: $(wc -l < /tmp/brain_source.txt) files"
echo "Target: $(wc -l < /tmp/brain_target.txt) files"

comm -23 /tmp/brain_source.txt /tmp/brain_target.txt > /tmp/unique_to_source.txt
comm -13 /tmp/brain_source.txt /tmp/brain_target.txt > /tmp/unique_to_target.txt
comm -12 /tmp/brain_source.txt /tmp/brain_target.txt > /tmp/in_both.txt

echo "Unique to source: $(wc -l < /tmp/unique_to_source.txt)"
echo "Unique to target: $(wc -l < /tmp/unique_to_target.txt)"
echo "In both: $(wc -l < /tmp/in_both.txt)"

echo "=== UNIQUE TO SOURCE ==="
awk -F'/' '{print $1}' /tmp/unique_to_source.txt | sort | uniq -c | sort -rn

echo "=== UNIQUE TO TARGET ==="
awk -F'/' '{print $1}' /tmp/unique_to_target.txt | sort | uniq -c | sort -rn

rsync -av --ignore-existing \
  "[SOURCE]/[SELECTED_FOLDER]/" \
  "[TARGET]/[SELECTED_FOLDER]/"

while IFS= read -r file; do
  dest="[TARGET]/$file"
  mkdir -p "$(dirname "$dest")"
  cp -n "[SOURCE]/$file" "$dest"
done < /tmp/unique_to_source.txt

cd [TARGET_AGENT_ROOT]
python3 resources/local-brain-search/build_index.py

rsync -av --ignore-existing \
  "[TARGET]/[SELECTED_FOLDER]/" \
  "[SOURCE]/[SELECTED_FOLDER]/"

cd [TARGET_AGENT_ROOT] && python3 resources/local-brain-search/build_index.py
cd [SOURCE_AGENT_ROOT] && python3 resources/local-brain-search/build_index.py

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

Files

Just SKILL.md in .claude/skills/brain-merge of Abilityai/cornelius.

Open the folder on GitHubat commit fd5e9a4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in Abilityai/cornelius, which our catalogue first saw on October 7, 2026.

• NeverSight/learn-skills.devdata/skills-md/abilityai/cornelius/brain-merge