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ci: add duplicate PR detection bot
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‎.github/workflows/duplicate-prs.yml‎

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name: Duplicate PR Check
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on:
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pull_request:
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types: [opened]
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jobs:
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check-duplicates:
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if: |
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github.event.pull_request.user.login != 'actions-user' &&
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github.event.pull_request.user.login != 'opencode' &&
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github.event.pull_request.user.login != 'rekram1-node' &&
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github.event.pull_request.user.login != 'thdxr' &&
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github.event.pull_request.user.login != 'kommander' &&
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github.event.pull_request.user.login != 'jayair' &&
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github.event.pull_request.user.login != 'fwang' &&
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github.event.pull_request.user.login != 'adamdotdevin' &&
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github.event.pull_request.user.login != 'iamdavidhill' &&
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github.event.pull_request.user.login != 'opencode-agent[bot]'
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runs-on: blacksmith-4vcpu-ubuntu-2404
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permissions:
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contents: read
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pull-requests: write
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steps:
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- name: Checkout repository
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uses: actions/checkout@v4
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with:
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fetch-depth: 1
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- name: Setup Bun
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uses: ./.github/actions/setup-bun
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- name: Install opencode
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run: curl -fsSL https://opencode.ai/install | bash
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- name: Check for duplicate PRs
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env:
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OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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PR_NUMBER: ${{ github.event.pull_request.number }}
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PR_TITLE: ${{ github.event.pull_request.title }}
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PR_BODY: ${{ github.event.pull_request.body }}
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run: |
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COMMENT=$(opencode run --agent duplicate-pr --print "Check for duplicate PRs related to this new PR:
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Title: $PR_TITLE
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Description: $PR_BODY")
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gh pr comment "$PR_NUMBER" --body "_The following comment was made by an LLM, it may be inaccurate:_
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$COMMENT"

‎.opencode/agent/duplicate-pr.md‎

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---
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mode: primary
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hidden: true
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model: opencode/claude-haiku-4-5
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color: "#E67E22"
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tools:
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"*": false
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"github-pr-search": true
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---
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You are a duplicate PR detection agent. When a PR is opened, your job is to search for potentially duplicate or related open PRs.
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Use the github-pr-search tool to search for PRs that might be addressing the same issue or feature.
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Search using keywords from the PR title and description. Try multiple searches with different relevant terms.
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If you find potential duplicates:
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- List them with their titles and URLs
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- Briefly explain why they might be related
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If no duplicates are found, say so clearly.
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Keep your response concise and actionable.

‎.opencode/opencode.jsonc‎

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},
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"tools": {
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"github-triage": false,
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"github-pr-search": false,
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},
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}

‎.opencode/tool/github-pr-search.ts‎

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/// <reference path="../env.d.ts" />
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import { tool } from "@opencode-ai/plugin"
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import DESCRIPTION from "./github-pr-search.txt"
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async function githubFetch(endpoint: string, options: RequestInit = {}) {
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const response = await fetch(`https://api.github.com${endpoint}`, {
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...options,
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headers: {
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Authorization: `Bearer ${process.env.GITHUB_TOKEN}`,
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Accept: "application/vnd.github+json",
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"Content-Type": "application/json",
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...options.headers,
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},
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})
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if (!response.ok) {
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throw new Error(`GitHub API error: ${response.status} ${response.statusText}`)
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}
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return response.json()
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}
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interface PR {
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title: string
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html_url: string
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}
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export default tool({
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description: DESCRIPTION,
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args: {
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query: tool.schema.string().describe("Search query for PR titles and descriptions"),
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limit: tool.schema.number().describe("Maximum number of results to return").default(10),
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offset: tool.schema.number().describe("Number of results to skip for pagination").default(0),
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},
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async execute(args) {
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const owner = "sst"
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const repo = "opencode"
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const page = Math.floor(args.offset / args.limit) + 1
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const searchQuery = encodeURIComponent(`${args.query} repo:${owner}/${repo} type:pr state:open`)
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const result = await githubFetch(
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`/search/issues?q=${searchQuery}&per_page=${args.limit}&page=${page}&sort=updated&order=desc`,
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)
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if (result.total_count === 0) {
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return `No PRs found matching "${args.query}"`
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}
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const prs = result.items as PR[]
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const formatted = prs.map((pr) => `${pr.title}\n${pr.html_url}`).join("\n\n")
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return `Found ${result.total_count} PRs (showing ${prs.length}):\n\n${formatted}`
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},
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})

‎.opencode/tool/github-pr-search.txt‎

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Use this tool to search GitHub pull requests by title and description.
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This tool searches PRs in the sst/opencode repository and returns LLM-friendly results including:
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- PR number and title
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- Author
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- State (open/closed/merged)
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- Labels
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- Description snippet
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Use the query parameter to search for keywords that might appear in PR titles or descriptions.

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