revdiff-plan

revdiff-plan - Review Codex Output

Review the last Codex assistant message with inline annotations using revdiff TUI in a terminal overlay.

Script Path Resolution

Resolve the script directory using repo root first, then fall back to Codex home:

SCRIPT_DIR="$(git rev-parse --show-toplevel 2>/dev/null)/plugins/codex/skills/revdiff-plan/scripts"
if [ ! -d "$SCRIPT_DIR" ]; then
    SCRIPT_DIR="${CODEX_HOME:-$HOME/.codex}/skills/revdiff-plan/scripts"
fi

Also resolve the launcher script from the revdiff skill:

LAUNCHER_DIR="$(git rev-parse --show-toplevel 2>/dev/null)/plugins/codex/skills/revdiff/scripts"
if [ ! -d "$LAUNCHER_DIR" ]; then
    LAUNCHER_DIR="${CODEX_HOME:-$HOME/.codex}/skills/revdiff/scripts"
fi

Use $SCRIPT_DIR and $LAUNCHER_DIR in place of script paths throughout this skill.

Activation Triggers

• "revdiff-plan", "review plan with revdiff", "annotate plan"
• "review last response", "annotate codex output"

How It Works

1. Extract the last Codex assistant message from rollout files
2. Write it to a temp markdown file
3. Launch revdiff with --only=<tempfile> in a terminal overlay
4. User reads the plan, adds annotations on specific lines
5. On quit, annotations are captured from stdout
6. Codex reads annotations and addresses each one (refine plan, answer questions, fix issues)
7. Loop: re-launch revdiff to verify changes, user can add more annotations
8. Done when user quits without annotations; clean up temp file

Workflow

Step 0: Verify Installation

which revdiff

If not found, guide installation:

• brew install umputun/apps/revdiff
• Binary releases: https://github.com/umputun/revdiff/releases

Also verify jq is installed (required for rollout extraction):

which jq

If not found: brew install jq

Step 1: Extract Last Assistant Message

Run the extraction script with --skip-current to avoid picking up this session's own output:

$SCRIPT_DIR/extract-last-message.sh --skip-current

The script:

• Uses a best-effort heuristic: picks the second most recent rollout JSONL file by modification time from ~/.codex/sessions/
• This assumes the newest file belongs to the active session; if concurrent Codex sessions exist, the wrong file may be selected
• Falls back to the newest file if only one session exists
• Extracts the last assistant message text using jq
• Outputs raw markdown to stdout
• Accepts an explicit rollout file path as an argument to bypass auto-detection when precision matters

If the script fails (no sessions, no messages), inform the user and stop. If the user reports that the wrong content was extracted, ask them to provide the rollout file path explicitly: $SCRIPT_DIR/extract-last-message.sh /path/to/rollout.jsonl

Capture the output and write it to a temp file:

TMPBASE="${TMPDIR:-/tmp}"
PLAN_FILE=$(mktemp "$TMPBASE/revdiff-plan-XXXXXX")
mv "$PLAN_FILE" "${PLAN_FILE}.md"
PLAN_FILE="${PLAN_FILE}.md"
$SCRIPT_DIR/extract-last-message.sh --skip-current > "$PLAN_FILE"

Step 2: Launch Review

Run the launcher script with --only=<tempfile>:

$LAUNCHER_DIR/launch-revdiff.sh --only="$PLAN_FILE"

The launcher sets REVDIFF_EXIT_CODE_ON_ANNOTATIONS; exit 10 means annotations were captured and is not a launcher failure. Treat other nonzero statuses as failures.

IMPORTANT -- long-running command: The launcher blocks until the user finishes reviewing in the TUI overlay. Set the bash timeout parameter to the maximum your harness allows (e.g. 1800000 or higher). Do NOT use run_in_background.

If the bash tool reports a timeout, use the same fallback as the revdiff skill:

1. Tell the user: "The bash tool timed out, but revdiff may still be open. Let me know when you're done reviewing."
2. Wait for the user to reply.
3. Read the most recent output file:

   output_file="$(ls -t "${TMPDIR:-/tmp}"/revdiff-output-* 2>/dev/null | head -1)"
   if [ -n "$output_file" ] && [ -f "$output_file" ]; then
     cat "$output_file"
   fi
   

Step 3: Process Annotations

If the bash tool reports exit 10, read stdout and process it as annotations; do not call it a failure. If the launcher produces output, the user made annotations. The output format is:

## plan-XXXXXX.md:12 ( )
this section needs more detail about error handling

## plan-XXXXXX.md:25 ( )
explain why we chose this approach over alternatives

Each annotation block has:

• ## filename:line (type) -- which file and line
• Comment text below -- what the user wants changed or clarified

Step 3.5: Classify Annotations

Split annotations into two categories:

Explanation requests -- annotation matches either rule (case-insensitive):

• contains two or more consecutive question marks anywhere in the text (??, ???, etc.) -- a language-neutral shortcut for "please explain"
• OR starts with one of: explain, remind, describe, what is, what are, how does, how do, clarify

These are questions the user wants answered, not plan changes.

Plan-change directives -- everything else. These are instructions to modify the plan content.

If explanation requests are found:

1. Answer each explanation request directly

2. If there are also plan-change directives, note them as pending

3. Enter the explanation loop:

   a. Write the explanation to a temp markdown file b. Launch revdiff with --only=<explanation-file> via the launcher script c. If user quits without annotations -- explanation accepted, proceed to pending directives or Step 5 d. If user annotates -- refine explanation, loop back to (b)

If no explanation requests -- proceed directly to Step 4.

Step 4: Address Annotations

For plan-change directives:

• Update the temp plan file with the requested changes
• Rewrite $PLAN_FILE with the updated content

Step 5: Loop

After addressing annotations, re-launch revdiff with the updated plan:

$LAUNCHER_DIR/launch-revdiff.sh --only="$PLAN_FILE"

The user can:

• Add more annotations -- go back to Step 3
• Quit without annotations -- review complete

Step 6: Done

When the launcher produces no output, the review is complete.

Clean up the temp file:

rm -f "$PLAN_FILE"

Inform the user that the plan review is complete. If the plan was modified during the review, present the final version.