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Transfer code between files with line-based precision.
Passed 16 of 20 test cases with the skill, and 11 of 20 without it.
and 5 more in the full report
7 fixed11 passed either way3 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.
We are inserting a critical database patch line at line 120 of `src/db/connection.py`. What flag should be passed to the helper script to create a safeguard copy of the original file before modifying?
| Checked | Without skill | With skill |
|---|---|---|
| Passes the --backup flag to line_insert.py | Missed | Passed |
The instructions your model reads when the skill loads.
Transfer code between files with precise line-based control. Dual-mode operation: native tools (1-10 files) or execution mode (10+ files, 90% token savings).
Use Read, Edit, Bash scripts for 1-10 file operations. Works immediately, no setup required.
from api.filesystem import batch_copy
from api.code_analysis import find_functions
functions = find_functions('app.py', pattern='handle_.*')
operations = [{
'source_file': 'app.py',
'start_line': f['start_line'],
'end_line': f['end_line'],
'target_file': 'handlers.py',
'target_line': -1
} for f in functions]
batch_copy(operations)
Read(file_path="src/auth.py") # Full file
Read(file_path="src/auth.py", offset=10, limit=20) # Line range
Grep(pattern="def authenticate", -n=true, -A=10) # Find function
test cases passed, vs 11 / 20 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.