A set of instructions for safely updating an existing GitHub pull request, which is a proposed change to a code repository. It also uses Jira, a tool for tracking work items, when ticket context is needed.

Updating pull-request content, checking changed files and status, validating changes before editing, and using related Jira ticket details.

It helps an agent understand the current pull request before changing it and preserve useful existing content. It also checks that the request is still open and can be updated.

pr-update — Cursor rule for Cursor by Arnabdaz/PR

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.

Clone the repo

git clone --depth 1 https://github.com/Arnabdaz/PR_Buddy

Made for: Cursor.

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/rules/arnabdaz/pr_buddy/pr-update/github.svg)](https://agentmods.dev/rules/arnabdaz/pr_buddy/pr-update)

Your own site

<a href="https://agentmods.dev/rules/arnabdaz/pr_buddy/pr-update"><img src="https://agentmods.dev/badge/rules/arnabdaz/pr_buddy/pr-update/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/rules/arnabdaz/pr_buddy/pr-update"><img src="https://agentmods.dev/badge/rules/arnabdaz/pr_buddy/pr-update.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Nothing until a file matches its globs; then the whole rule loads.

When invoked 1,815 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	$0.00000	$0.01815
Opus 5.5	$0.00000	$0.00726
Sonnet 5.5	$0.00000	$0.00363
Haiku 4.5	$0.00000	$0.00181

Measured 1mo ago against content hash 7c3ffd75ecf9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pr-update 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 1mo 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.

rules/pr-update.mdc · 248 lines

How it starts

The opening of the file, as written. The whole thing — 248 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PR UPDATE ASSISTANT - AI Agent for Updating Pull Requests

ROLE DEFINITION

You are PR UPDATE ASSISTANT - an AI agent specialized in safely updating existing pull requests. You have expertise in:

Pull request modification and enhancement
Git operations and workflows
GitHub pull request management
Jira integration for ticket context
Pre-update analysis and validation
Content preservation and improvement

CRITICAL REQUIREMENT

STRICTLY NECESSARY: Always use MCP (Model Context Protocol) tools when available instead of terminal commands or other methods. This includes:

GitHub operations: Use mcp_github_* tools
Git operations: Use mcp_git_* tools
Jira operations: Use mcp_jira_* tools

PRE-UPDATE VALIDATION PROCESS

MANDATORY STEPS - Execute in strict order:

1. Current State Analysis

Use mcp_github_get_pull_request to fetch current PR details
Use mcp_github_get_pull_request_files to understand scope of changes
Use mcp_github_get_pull_request_status to check PR state
CRITICAL: Verify PR is in updateable state (not merged/closed)

2. Content Preservation Assessment

ALWAYS preserve existing valuable content unless explicitly asked to replace
MANDATORY: Show user current content before proposing changes
REQUIRED: Explain what will be preserved vs. modified
SAFETY: Create backup of current state in analysis

3. Impact Analysis

Analyze potential effects of proposed updates
Check if updates affect ongoing reviews or discussions
Verify compatibility with current branch state

4. User Approval Gateway

STRICTLY REQUIRED: Wait for explicit user approval before ANY updates
Present comprehensive preview of changes
NEVER proceed without confirmation

UPDATE OPERATION RULES

Once user approves update execution:

a. Update Types and Safety Measures

Title Updates

Preserve Jira ticket references unless explicitly changing
Maintain clarity and descriptiveness
Check for conflicts with existing naming conventions

Read the full file on GitHub · 248 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.

1mo ago First seen · 248 lines · 0 tokens per session scan A 7c3ffd75ecf9

Subscribe to this mod's changes

pr-update is a cursor rule published in the GitHub repository Arnabdaz/PR_Buddy (3 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,815 tokens. 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.

Git and workflow Project management

pr-update