2 files changed, 59 insertions, 6 deletions

diff --git a/packages/opencode/src/cli/cmd/github.ts b/packages/opencode/src/cli/cmd/github.ts
index 1f60e81e9..5f9bcded1 100644
--- a/packages/opencode/src/cli/cmd/github.ts
+++ b/packages/opencode/src/cli/cmd/github.ts
@@ -7,7 +7,7 @@ import { graphql } from "@octokit/graphql"
 import * as core from "@actions/core"
 import * as github from "@actions/github"
 import type { Context } from "@actions/github/lib/context"
-import type { IssueCommentEvent } from "@octokit/webhooks-types"
+import type { IssueCommentEvent, PullRequestReviewCommentEvent } from "@octokit/webhooks-types"
 import { UI } from "../ui"
 import { cmd } from "./cmd"
 import { ModelsDev } from "../../provider/models"
@@ -328,6 +328,8 @@ export const GithubInstallCommand = cmd({
 on:
   issue_comment:
     types: [created]
+  pull_request_review_comment:
+    types: [created]
 
 jobs:
   opencode:
@@ -378,7 +380,7 @@ export const GithubRunCommand = cmd({
       const isMock = args.token || args.event
 
       const context = isMock ? (JSON.parse(args.event!) as Context) : github.context
-      if (context.eventName !== "issue_comment") {
+      if (context.eventName !== "issue_comment" && context.eventName !== "pull_request_review_comment") {
         core.setFailed(`Unsupported event type: ${context.eventName}`)
         process.exit(1)
       }
@@ -387,9 +389,13 @@ export const GithubRunCommand = cmd({
       const runId = normalizeRunId()
       const share = normalizeShare()
       const { owner, repo } = context.repo
-      const payload = context.payload as IssueCommentEvent
+      const payload = context.payload as IssueCommentEvent | PullRequestReviewCommentEvent
       const actor = context.actor
-      const issueId = payload.issue.number
+
+      const issueId =
+        context.eventName === "pull_request_review_comment"
+          ? (payload as PullRequestReviewCommentEvent).pull_request.number
+          : (payload as IssueCommentEvent).issue.number
       const runUrl = `/${owner}/${repo}/actions/runs/${runId}`
       const shareBaseUrl = isMock ? "https://dev.opencode.ai" : "https://opencode.ai"
 
@@ -531,11 +537,39 @@ export const GithubRunCommand = cmd({
         throw new Error(`Invalid share value: ${value}. Share must be a boolean.`)
       }
 
+      function getReviewCommentContext() {
+        if (context.eventName !== "pull_request_review_comment") {
+          return null
+        }
+
+        const reviewPayload = payload as PullRequestReviewCommentEvent
+        return {
+          file: reviewPayload.comment.path,
+          diffHunk: reviewPayload.comment.diff_hunk,
+          line: reviewPayload.comment.line,
+          originalLine: reviewPayload.comment.original_line,
+          position: reviewPayload.comment.position,
+          commitId: reviewPayload.comment.commit_id,
+          originalCommitId: reviewPayload.comment.original_commit_id,
+        }
+      }
+
       async function getUserPrompt() {
+        const reviewContext = getReviewCommentContext()
         let prompt = (() => {
           const body = payload.comment.body.trim()
-          if (body === "/opencode" || body === "/oc") return "Summarize this thread"
-          if (body.includes("/opencode") || body.includes("/oc")) return body
+          if (body === "/opencode" || body === "/oc") {
+            if (reviewContext) {
+              return `Review this code change and suggest improvements for the commented lines:\n\nFile: ${reviewContext.file}\nLines: ${reviewContext.line}\n\n${reviewContext.diffHunk}`
+            }
+            return "Summarize this thread"
+          }
+          if (body.includes("/opencode") || body.includes("/oc")) {
+            if (reviewContext) {
+              return `${body}\n\nContext: You are reviewing a comment on file "${reviewContext.file}" at line ${reviewContext.line}.\n\nDiff context:\n${reviewContext.diffHunk}`
+            }
+            return body
+          }
           throw new Error("Comments must mention `/opencode` or `/oc`")
         })()
 
diff --git a/packages/web/src/content/docs/github.mdx b/packages/web/src/content/docs/github.mdx
index 359f696fc..19c7782ef 100644
--- a/packages/web/src/content/docs/github.mdx
+++ b/packages/web/src/content/docs/github.mdx
@@ -45,6 +45,8 @@ Or you can set it up manually.
    on:
      issue_comment:
        types: [created]
+     pull_request_review_comment:
+       types: [created]
 
    jobs:
      opencode:
@@ -129,3 +131,20 @@ Here are some examples of how you can use opencode in GitHub.
   ```
 
   opencode will implement the requested change and commit it to the same PR.
+
+- **Review specific code lines**
+
+  Leave a comment directly on code lines in the PR's "Files" tab. opencode automatically detects the file, line numbers, and diff context to provide precise responses.
+
+  ```
+  [Comment on specific lines in Files tab]
+  /oc add error handling here
+  ```
+
+  When commenting on specific lines, opencode receives:
+  - The exact file being reviewed
+  - The specific lines of code
+  - The surrounding diff context
+  - Line number information
+
+  This allows for more targeted requests without needing to specify file paths or line numbers manually.