fetch-diff - SKILL.md Agent Skill

name: fetch-diff description: Fetch PR diff with filtering and line numbers for code review. allowed-tools: - Bash(uv run --package skills skills fetch-diff:*)

Fetch PR Diff

Fetches a pull request diff and adds line numbers for easier review comment placement. Auto-generated files are shown with masked diffs.

Usage

uv run --package skills skills fetch-diff <pr_url> [--files <pattern> ...]

Examples:

# Fetch the full diff
uv run --package skills skills fetch-diff https://github.com/mlflow/mlflow/pull/123

# Fetch only Python files
uv run --package skills skills fetch-diff https://github.com/mlflow/mlflow/pull/123 --files '*.py'

# Fetch only frontend files
uv run --package skills skills fetch-diff https://github.com/mlflow/mlflow/pull/123 --files 'mlflow/server/js/*'

# Multiple patterns
uv run --package skills skills fetch-diff https://github.com/mlflow/mlflow/pull/123 --files '*.py' '*.ts'

Token is auto-detected from GH_TOKEN env var or gh auth token.

Output Example

Regular file:

diff --git a/path/to/file.py b/path/to/file.py
index abc123..def456 100644
--- a/path/to/file.py
+++ b/path/to/file.py
@@ -10,7 +10,7 @@
10    10 |  import os
11    11 |  import sys
12    12 |  from typing import Optional
13       | -from old_module import OldClass
      14 | +from new_module import NewClass
14    15 |
15    16 |  def process_data(input_file: str) -> dict:

Auto-generated file (masked):

diff --git a/uv.lock b/uv.lock
index abc123..def456 100644
--- a/uv.lock
+++ b/uv.lock
[Auto-generated file - diff masked]

Deleted file (masked):

diff --git a/path/to/removed.py b/dev/null
index abc123..0000000 100644
--- a/path/to/removed.py
+++ /dev/null
[Deleted file - diff masked]

Each line is annotated as old_line new_line | <marker> content:

- marker (left number only) -> deleted line, side=LEFT, line=old_line
+ marker (right number only) -> added line, side=RIGHT, line=new_line
No marker (both numbers) -> unchanged line, side=RIGHT, line=new_line