What is parallel-pr-scope-overlap-tiebreaker-delta-check?

A review method for choosing between two pull requests that implement the same change, where a pull request is a proposed code change for review and merging.

Use it to compare both pull-request diffs and check for meaningful differences before closing one and merging the other.

It prevents simple tie-breakers such as age, merge status, or reviewer approval from selecting the weaker implementation.

parallel-pr-scope-overlap-tiebreaker-delta-check

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add wan-huiyan/agent-traffic-control --skill parallel-pr-scope-overlap-tiebreaker-delta-check

Clone the repo

git clone --depth 1 https://github.com/wan-huiyan/agent-traffic-control

Made for: Claude Code.

Or install agent-traffic-control, the plugin that ships this one along with the rest of its 124 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/wan-huiyan/agent-traffic-control/parallel-pr-scope-overlap-tiebreaker-delta-check/github.svg)](https://agentmods.dev/skills/wan-huiyan/agent-traffic-control/parallel-pr-scope-overlap-tiebreaker-delta-check)

Your own site

<a href="https://agentmods.dev/skills/wan-huiyan/agent-traffic-control/parallel-pr-scope-overlap-tiebreaker-delta-check"><img src="https://agentmods.dev/badge/skills/wan-huiyan/agent-traffic-control/parallel-pr-scope-overlap-tiebreaker-delta-check/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/wan-huiyan/agent-traffic-control/parallel-pr-scope-overlap-tiebreaker-delta-check"><img src="https://agentmods.dev/badge/skills/wan-huiyan/agent-traffic-control/parallel-pr-scope-overlap-tiebreaker-delta-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 384 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,607 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00384	$0.03607
Opus 5.5	$0.00154	$0.01443
Sonnet 5.5	$0.00077	$0.00721
Haiku 4.5	$0.00038	$0.00361

Measured 2mo ago against content hash 03acd60927d3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

parallel-pr-scope-overlap-tiebreaker-delta-check scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/agent-traffic-control/skills/parallel-pr-scope-overlap-tiebreaker-delta-check/SKILL.md · 285 lines

How it starts

The opening of the file, as written. The whole thing — 285 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pre-Tiebreaker Delta Check on Scope-Overlapping Parallel PRs

Problem

Two parallel sessions independently opened PRs targeting the same issue (same fix scope, same files, same goal). A session-handoff prompt later asks a third session to pick a winner. The prompt's recommended tiebreaker is some combination of:

"Merge the first-mover" (older PR by createdAt)
"Merge the one that's clean against main" (mergeable: CLEAN, no rebase needed)
"Merge the one with reviewer APPROVE" (assumed implies higher quality)
"Merge the one with wider scope" (e.g., bundles verification + handoff doc)

These rules are about merge mechanics, not implementation quality. They can — and do — ship the inferior PR while the better implementation gets closed.

Trigger Conditions

ALL of the following must hold:

Two parallel PRs are open simultaneously, targeting overlapping scope (same issue number cited as Closes #N; same files touched; same fix intent).
A session-handoff prompt explicitly suggests a tiebreaker default ("merge #X because it's first-mover", "clean against main", "wider scope"), or you're operating from such instructions in auto-mode.
The two PRs were authored by different sessions (different worktrees, different branches, different timestamps, different commit authors or different co-authored-by chains).
You haven't yet run gh pr diff <A> and gh pr diff <B> side-by-side to compare implementations.

If those conditions hold and you're about to merge based on the prompt's recommendation alone, STOP — run the delta check first.

Solution

Step 1 — Refresh both PR snapshots

A prompt authored hours ago may cite stale state (e.g., "PR #X is CLEAN, PR #Y is CONFLICTING"). Main may have advanced; the relative state often flips by the time the next session runs.

gh pr view <A> --json state,mergeable,mergeStateStatus,statusCheckRollup,additions,deletions,createdAt,headRefName
gh pr view <B> --json state,mergeable,mergeStateStatus,statusCheckRollup,additions,deletions,createdAt,headRefName

Read the full file on GitHub · 285 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 285 lines · 384 tokens per session scan A 03acd60927d3

Subscribe to this mod's changes

parallel-pr-scope-overlap-tiebreaker-delta-check is a skill published in the GitHub repository wan-huiyan/agent-traffic-control (3 stars, last pushed 1mo ago), licensed MIT. It adds 384 tokens to every session and 3,607 once invoked, about $0.0015 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Claude Code Code review Git and workflow Multi-Agent claude-code-plugin claude-code-skill git-worktree parallel-agents

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