Update Pull Request Description

Update an existing PR's description, working around sandbox heredoc limitations.

Instructions

1. Get current PR info

# View current PR (assumes on feature branch)
gh pr view --json number,title,body

# Or specify PR number
gh pr view 123 --json number,title,body

2. Write the new body to a temp file

Use printf to avoid heredoc issues:

printf '%s\n' \
  '## Problem' \
  '' \
  'Description of the problem...' \
  '' \
  '## Solution' \
  '' \
  'Description of the solution...' \
  > /tmp/claude/pr-body.md

For longer content, build it incrementally:

# Start fresh
> /tmp/claude/pr-body.md

# Add sections
printf '%s\n' '## Problem' '' >> /tmp/claude/pr-body.md
printf '%s\n' 'The issue is...' '' >> /tmp/claude/pr-body.md
printf '%s\n' '## Solution' '' >> /tmp/claude/pr-body.md
printf '%s\n' 'We fixed it by...' >> /tmp/claude/pr-body.md

3. Update the PR

# Using body-file (may show GraphQL warning but still works)
gh pr edit 123 --body-file /tmp/claude/pr-body.md

# If that fails, use the API directly
gh api repos/{owner}/{repo}/pulls/123 --method PATCH \
  -f body="$(cat /tmp/claude/pr-body.md)"

4. Verify the update

gh pr view 123 --json body -q '.body' | head -20

5. Clean up

rm /tmp/claude/pr-body.md

Common Issues

GraphQL Projects (classic) warning: This warning appears but the update usually still succeeds. Verify with gh pr view.

Heredoc fails: Expected in sandbox mode. Use printf approach.

Body too long for single printf: Build the file incrementally with append (>>).

Special characters: Use single quotes. For apostrophes: 'Don'\''t'

PR Body Structure

Follow this template for consistency:

## Problem

[What issue exists?]

## Solution

[High-level approach]

### Key design decisions

**1. [Decision]**
[Explanation]

## Files changed

| File           | Change      |
| -------------- | ----------- |
| `path/file.ts` | Description |

## Test plan

- [ ] Test item

---

🤖 _PR by [Claude Code](https://claude.com/claude-code)_

Examples

Quick body update:

printf '%s\n' '## Problem' '' 'Users cannot login' '' '## Solution' '' 'Fixed auth token validation' '' '---' '🤖 _PR by [Claude Code](https://claude.com/claude-code)_' > /tmp/claude/pr-body.md
gh pr edit 123 --body-file /tmp/claude/pr-body.md

Using API fallback:

gh api repos/myorg/myrepo/pulls/123 --method PATCH \
  -f body="$(cat /tmp/claude/pr-body.md)"