diff --git a/src/github/api/queries/github.ts b/src/github/api/queries/github.ts
index 25395b9..2341a55 100644
--- a/src/github/api/queries/github.ts
+++ b/src/github/api/queries/github.ts
@@ -46,6 +46,8 @@ export const PR_QUERY = `
               login
             }
             createdAt
+            updatedAt
+            lastEditedAt
             isMinimized
           }
         }
@@ -59,6 +61,8 @@ export const PR_QUERY = `
             body
             state
             submittedAt
+            updatedAt
+            lastEditedAt
             comments(first: 100) {
               nodes {
                 id
@@ -70,6 +74,8 @@ export const PR_QUERY = `
                   login
                 }
                 createdAt
+                updatedAt
+                lastEditedAt
                 isMinimized
               }
             }
@@ -100,6 +106,8 @@ export const ISSUE_QUERY = `
               login
             }
             createdAt
+            updatedAt
+            lastEditedAt
             isMinimized
           }
         }
diff --git a/src/github/data/fetcher.ts b/src/github/data/fetcher.ts
index ace1b85..e6cec2c 100644
--- a/src/github/data/fetcher.ts
+++ b/src/github/data/fetcher.ts
@@ -1,6 +1,12 @@
 import { execFileSync } from "child_process";
 import type { Octokits } from "../api/client";
 import { ISSUE_QUERY, PR_QUERY, USER_QUERY } from "../api/queries/github";
+import {
+  isIssueCommentEvent,
+  isPullRequestReviewEvent,
+  isPullRequestReviewCommentEvent,
+  type ParsedGitHubContext,
+} from "../context";
 import type {
   GitHubComment,
   GitHubFile,
@@ -13,12 +19,101 @@ import type {
 import type { CommentWithImages } from "../utils/image-downloader";
 import { downloadCommentImages } from "../utils/image-downloader";
 
+/**
+ * Extracts the trigger timestamp from the GitHub webhook payload.
+ * This timestamp represents when the triggering comment/review/event was created.
+ *
+ * @param context - Parsed GitHub context from webhook
+ * @returns ISO timestamp string or undefined if not available
+ */
+export function extractTriggerTimestamp(
+  context: ParsedGitHubContext,
+): string | undefined {
+  if (isIssueCommentEvent(context)) {
+    return context.payload.comment.created_at || undefined;
+  } else if (isPullRequestReviewEvent(context)) {
+    return context.payload.review.submitted_at || undefined;
+  } else if (isPullRequestReviewCommentEvent(context)) {
+    return context.payload.comment.created_at || undefined;
+  }
+
+  return undefined;
+}
+
+/**
+ * Filters comments to only include those that existed in their final state before the trigger time.
+ * This prevents malicious actors from editing comments after the trigger to inject harmful content.
+ *
+ * @param comments - Array of GitHub comments to filter
+ * @param triggerTime - ISO timestamp of when the trigger comment was created
+ * @returns Filtered array of comments that were created and last edited before trigger time
+ */
+export function filterCommentsToTriggerTime<
+  T extends { createdAt: string; updatedAt?: string; lastEditedAt?: string },
+>(comments: T[], triggerTime: string | undefined): T[] {
+  if (!triggerTime) return comments;
+
+  const triggerTimestamp = new Date(triggerTime).getTime();
+
+  return comments.filter((comment) => {
+    // Comment must have been created before trigger (not at or after)
+    const createdTimestamp = new Date(comment.createdAt).getTime();
+    if (createdTimestamp >= triggerTimestamp) {
+      return false;
+    }
+
+    // If comment has been edited, the most recent edit must have occurred before trigger
+    // Use lastEditedAt if available, otherwise fall back to updatedAt
+    const lastEditTime = comment.lastEditedAt || comment.updatedAt;
+    if (lastEditTime) {
+      const lastEditTimestamp = new Date(lastEditTime).getTime();
+      if (lastEditTimestamp >= triggerTimestamp) {
+        return false;
+      }
+    }
+
+    return true;
+  });
+}
+
+/**
+ * Filters reviews to only include those that existed in their final state before the trigger time.
+ * Similar to filterCommentsToTriggerTime but for GitHubReview objects which use submittedAt instead of createdAt.
+ */
+export function filterReviewsToTriggerTime<
+  T extends { submittedAt: string; updatedAt?: string; lastEditedAt?: string },
+>(reviews: T[], triggerTime: string | undefined): T[] {
+  if (!triggerTime) return reviews;
+
+  const triggerTimestamp = new Date(triggerTime).getTime();
+
+  return reviews.filter((review) => {
+    // Review must have been submitted before trigger (not at or after)
+    const submittedTimestamp = new Date(review.submittedAt).getTime();
+    if (submittedTimestamp >= triggerTimestamp) {
+      return false;
+    }
+
+    // If review has been edited, the most recent edit must have occurred before trigger
+    const lastEditTime = review.lastEditedAt || review.updatedAt;
+    if (lastEditTime) {
+      const lastEditTimestamp = new Date(lastEditTime).getTime();
+      if (lastEditTimestamp >= triggerTimestamp) {
+        return false;
+      }
+    }
+
+    return true;
+  });
+}
+
 type FetchDataParams = {
   octokits: Octokits;
   repository: string;
   prNumber: string;
   isPR: boolean;
   triggerUsername?: string;
+  triggerTime?: string;
 };
 
 export type GitHubFileWithSHA = GitHubFile & {
@@ -41,6 +136,7 @@ export async function fetchGitHubData({
   prNumber,
   isPR,
   triggerUsername,
+  triggerTime,
 }: FetchDataParams): Promise<FetchDataResult> {
   const [owner, repo] = repository.split("/");
   if (!owner || !repo) {
@@ -68,7 +164,10 @@ export async function fetchGitHubData({
         const pullRequest = prResult.repository.pullRequest;
         contextData = pullRequest;
         changedFiles = pullRequest.files.nodes || [];
-        comments = pullRequest.comments?.nodes || [];
+        comments = filterCommentsToTriggerTime(
+          pullRequest.comments?.nodes || [],
+          triggerTime,
+        );
         reviewData = pullRequest.reviews || [];
 
         console.log(`Successfully fetched PR #${prNumber} data`);
@@ -88,7 +187,10 @@ export async function fetchGitHubData({
 
       if (issueResult.repository.issue) {
         contextData = issueResult.repository.issue;
-        comments = contextData?.comments?.nodes || [];
+        comments = filterCommentsToTriggerTime(
+          contextData?.comments?.nodes || [],
+          triggerTime,
+        );
 
         console.log(`Successfully fetched issue #${prNumber} data`);
       } else {
@@ -141,25 +243,35 @@ export async function fetchGitHubData({
       body: c.body,
     }));
 
-  const reviewBodies: CommentWithImages[] =
-    reviewData?.nodes
-      ?.filter((r) => r.body)
-      .map((r) => ({
-        type: "review_body" as const,
-        id: r.databaseId,
-        pullNumber: prNumber,
-        body: r.body,
-      })) ?? [];
+  // Filter review bodies to trigger time
+  const filteredReviewBodies = reviewData?.nodes
+    ? filterReviewsToTriggerTime(reviewData.nodes, triggerTime).filter(
+        (r) => r.body,
+      )
+    : [];
 
-  const reviewComments: CommentWithImages[] =
-    reviewData?.nodes
-      ?.flatMap((r) => r.comments?.nodes ?? [])
-      .filter((c) => c.body && !c.isMinimized)
-      .map((c) => ({
-        type: "review_comment" as const,
-        id: c.databaseId,
-        body: c.body,
-      })) ?? [];
+  const reviewBodies: CommentWithImages[] = filteredReviewBodies.map((r) => ({
+    type: "review_body" as const,
+    id: r.databaseId,
+    pullNumber: prNumber,
+    body: r.body,
+  }));
+
+  // Filter review comments to trigger time
+  const allReviewComments =
+    reviewData?.nodes?.flatMap((r) => r.comments?.nodes ?? []) ?? [];
+  const filteredReviewComments = filterCommentsToTriggerTime(
+    allReviewComments,
+    triggerTime,
+  );
+
+  const reviewComments: CommentWithImages[] = filteredReviewComments
+    .filter((c) => c.body && !c.isMinimized)
+    .map((c) => ({
+      type: "review_comment" as const,
+      id: c.databaseId,
+      body: c.body,
+    }));
 
   // Add the main issue/PR body if it has content
   const mainBody: CommentWithImages[] = contextData.body
diff --git a/src/github/types.ts b/src/github/types.ts
index f31d841..41e0896 100644
--- a/src/github/types.ts
+++ b/src/github/types.ts
@@ -10,6 +10,8 @@ export type GitHubComment = {
   body: string;
   author: GitHubAuthor;
   createdAt: string;
+  updatedAt?: string;
+  lastEditedAt?: string;
   isMinimized?: boolean;
 };
 
@@ -41,6 +43,8 @@ export type GitHubReview = {
   body: string;
   state: string;
   submittedAt: string;
+  updatedAt?: string;
+  lastEditedAt?: string;
   comments: {
     nodes: GitHubReviewComment[];
   };
diff --git a/src/modes/tag/index.ts b/src/modes/tag/index.ts
index 48c17a3..c8fc12a 100644
--- a/src/modes/tag/index.ts
+++ b/src/modes/tag/index.ts
@@ -6,7 +6,10 @@ import { createInitialComment } from "../../github/operations/comments/create-in
 import { setupBranch } from "../../github/operations/branch";
 import { configureGitAuth } from "../../github/operations/git-config";
 import { prepareMcpConfig } from "../../mcp/install-mcp-server";
-import { fetchGitHubData } from "../../github/data/fetcher";
+import {
+  fetchGitHubData,
+  extractTriggerTimestamp,
+} from "../../github/data/fetcher";
 import { createPrompt, generateDefaultPrompt } from "../../create-prompt";
 import { isEntityContext } from "../../github/context";
 import type { PreparedContext } from "../../create-prompt/types";
@@ -70,12 +73,15 @@ export const tagMode: Mode = {
     const commentData = await createInitialComment(octokit.rest, context);
     const commentId = commentData.id;
 
+    const triggerTime = extractTriggerTimestamp(context);
+
     const githubData = await fetchGitHubData({
       octokits: octokit,
       repository: `${context.repository.owner}/${context.repository.repo}`,
       prNumber: context.entityNumber.toString(),
       isPR: context.isPR,
       triggerUsername: context.actor,
+      triggerTime,
     });
 
     // Setup branch
diff --git a/test/data-fetcher.test.ts b/test/data-fetcher.test.ts
new file mode 100644
index 0000000..28e3135
--- /dev/null
+++ b/test/data-fetcher.test.ts
@@ -0,0 +1,699 @@
+import { describe, expect, it, jest } from "bun:test";
+import {
+  extractTriggerTimestamp,
+  fetchGitHubData,
+  filterCommentsToTriggerTime,
+  filterReviewsToTriggerTime,
+} from "../src/github/data/fetcher";
+import {
+  createMockContext,
+  mockIssueCommentContext,
+  mockPullRequestReviewContext,
+  mockPullRequestReviewCommentContext,
+  mockPullRequestOpenedContext,
+  mockIssueOpenedContext,
+} from "./mockContext";
+import type { GitHubComment, GitHubReview } from "../src/github/types";
+
+describe("extractTriggerTimestamp", () => {
+  it("should extract timestamp from IssueCommentEvent", () => {
+    const context = mockIssueCommentContext;
+    const timestamp = extractTriggerTimestamp(context);
+    expect(timestamp).toBe("2024-01-15T12:30:00Z");
+  });
+
+  it("should extract timestamp from PullRequestReviewEvent", () => {
+    const context = mockPullRequestReviewContext;
+    const timestamp = extractTriggerTimestamp(context);
+    expect(timestamp).toBe("2024-01-15T15:30:00Z");
+  });
+
+  it("should extract timestamp from PullRequestReviewCommentEvent", () => {
+    const context = mockPullRequestReviewCommentContext;
+    const timestamp = extractTriggerTimestamp(context);
+    expect(timestamp).toBe("2024-01-15T16:45:00Z");
+  });
+
+  it("should return undefined for pull_request event", () => {
+    const context = mockPullRequestOpenedContext;
+    const timestamp = extractTriggerTimestamp(context);
+    expect(timestamp).toBeUndefined();
+  });
+
+  it("should return undefined for issues event", () => {
+    const context = mockIssueOpenedContext;
+    const timestamp = extractTriggerTimestamp(context);
+    expect(timestamp).toBeUndefined();
+  });
+
+  it("should handle missing timestamp fields gracefully", () => {
+    const context = createMockContext({
+      eventName: "issue_comment",
+      payload: {
+        comment: {
+          // No created_at field
+          id: 123,
+          body: "test",
+        },
+      } as any,
+    });
+    const timestamp = extractTriggerTimestamp(context);
+    expect(timestamp).toBeUndefined();
+  });
+});
+
+describe("filterCommentsToTriggerTime", () => {
+  const createMockComment = (
+    createdAt: string,
+    updatedAt?: string,
+    lastEditedAt?: string,
+  ): GitHubComment => ({
+    id: String(Math.random()),
+    databaseId: String(Math.random()),
+    body: "Test comment",
+    author: { login: "test-user" },
+    createdAt,
+    updatedAt,
+    lastEditedAt,
+    isMinimized: false,
+  });
+
+  const triggerTime = "2024-01-15T12:00:00Z";
+
+  describe("comment creation time filtering", () => {
+    it("should include comments created before trigger time", () => {
+      const comments = [
+        createMockComment("2024-01-15T11:00:00Z"),
+        createMockComment("2024-01-15T11:30:00Z"),
+        createMockComment("2024-01-15T11:59:59Z"),
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, triggerTime);
+      expect(filtered.length).toBe(3);
+      expect(filtered).toEqual(comments);
+    });
+
+    it("should exclude comments created after trigger time", () => {
+      const comments = [
+        createMockComment("2024-01-15T12:00:01Z"),
+        createMockComment("2024-01-15T13:00:00Z"),
+        createMockComment("2024-01-16T00:00:00Z"),
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, triggerTime);
+      expect(filtered.length).toBe(0);
+    });
+
+    it("should handle exact timestamp match (at trigger time)", () => {
+      const comment = createMockComment("2024-01-15T12:00:00Z");
+      const filtered = filterCommentsToTriggerTime([comment], triggerTime);
+      // Comments created exactly at trigger time should be excluded for security
+      expect(filtered.length).toBe(0);
+    });
+  });
+
+  describe("comment edit time filtering", () => {
+    it("should include comments edited before trigger time", () => {
+      const comments = [
+        createMockComment("2024-01-15T10:00:00Z", "2024-01-15T11:00:00Z"),
+        createMockComment(
+          "2024-01-15T10:00:00Z",
+          undefined,
+          "2024-01-15T11:30:00Z",
+        ),
+        createMockComment(
+          "2024-01-15T10:00:00Z",
+          "2024-01-15T11:00:00Z",
+          "2024-01-15T11:30:00Z",
+        ),
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, triggerTime);
+      expect(filtered.length).toBe(3);
+      expect(filtered).toEqual(comments);
+    });
+
+    it("should exclude comments edited after trigger time", () => {
+      const comments = [
+        createMockComment("2024-01-15T10:00:00Z", "2024-01-15T13:00:00Z"),
+        createMockComment(
+          "2024-01-15T10:00:00Z",
+          undefined,
+          "2024-01-15T13:00:00Z",
+        ),
+        createMockComment(
+          "2024-01-15T10:00:00Z",
+          "2024-01-15T11:00:00Z",
+          "2024-01-15T13:00:00Z",
+        ),
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, triggerTime);
+      expect(filtered.length).toBe(0);
+    });
+
+    it("should prioritize lastEditedAt over updatedAt", () => {
+      const comment = createMockComment(
+        "2024-01-15T10:00:00Z",
+        "2024-01-15T13:00:00Z", // updatedAt after trigger
+        "2024-01-15T11:00:00Z", // lastEditedAt before trigger
+      );
+
+      const filtered = filterCommentsToTriggerTime([comment], triggerTime);
+      // lastEditedAt takes precedence, so this should be included
+      expect(filtered.length).toBe(1);
+      expect(filtered[0]).toBe(comment);
+    });
+
+    it("should handle comments without edit timestamps", () => {
+      const comment = createMockComment("2024-01-15T10:00:00Z");
+      expect(comment.updatedAt).toBeUndefined();
+      expect(comment.lastEditedAt).toBeUndefined();
+
+      const filtered = filterCommentsToTriggerTime([comment], triggerTime);
+      expect(filtered.length).toBe(1);
+      expect(filtered[0]).toBe(comment);
+    });
+
+    it("should exclude comments edited exactly at trigger time", () => {
+      const comments = [
+        createMockComment("2024-01-15T10:00:00Z", "2024-01-15T12:00:00Z"), // updatedAt exactly at trigger
+        createMockComment(
+          "2024-01-15T10:00:00Z",
+          undefined,
+          "2024-01-15T12:00:00Z",
+        ), // lastEditedAt exactly at trigger
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, triggerTime);
+      expect(filtered.length).toBe(0);
+    });
+  });
+
+  describe("edge cases", () => {
+    it("should return all comments when no trigger time provided", () => {
+      const comments = [
+        createMockComment("2024-01-15T10:00:00Z"),
+        createMockComment("2024-01-15T13:00:00Z"),
+        createMockComment("2024-01-16T00:00:00Z"),
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, undefined);
+      expect(filtered.length).toBe(3);
+      expect(filtered).toEqual(comments);
+    });
+
+    it("should handle millisecond precision", () => {
+      const comments = [
+        createMockComment("2024-01-15T12:00:00.001Z"), // After trigger by 1ms
+        createMockComment("2024-01-15T11:59:59.999Z"), // Before trigger
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, triggerTime);
+      expect(filtered.length).toBe(1);
+      expect(filtered[0]?.createdAt).toBe("2024-01-15T11:59:59.999Z");
+    });
+
+    it("should handle various ISO timestamp formats", () => {
+      const comments = [
+        createMockComment("2024-01-15T11:00:00Z"),
+        createMockComment("2024-01-15T11:00:00.000Z"),
+        createMockComment("2024-01-15T11:00:00+00:00"),
+      ];
+
+      const filtered = filterCommentsToTriggerTime(comments, triggerTime);
+      expect(filtered.length).toBe(3);
+    });
+  });
+});
+
+describe("filterReviewsToTriggerTime", () => {
+  const createMockReview = (
+    submittedAt: string,
+    updatedAt?: string,
+    lastEditedAt?: string,
+  ): GitHubReview => ({
+    id: String(Math.random()),
+    databaseId: String(Math.random()),
+    author: { login: "reviewer" },
+    body: "Test review",
+    state: "APPROVED",
+    submittedAt,
+    updatedAt,
+    lastEditedAt,
+    comments: { nodes: [] },
+  });
+
+  const triggerTime = "2024-01-15T12:00:00Z";
+
+  describe("review submission time filtering", () => {
+    it("should include reviews submitted before trigger time", () => {
+      const reviews = [
+        createMockReview("2024-01-15T11:00:00Z"),
+        createMockReview("2024-01-15T11:30:00Z"),
+        createMockReview("2024-01-15T11:59:59Z"),
+      ];
+
+      const filtered = filterReviewsToTriggerTime(reviews, triggerTime);
+      expect(filtered.length).toBe(3);
+      expect(filtered).toEqual(reviews);
+    });
+
+    it("should exclude reviews submitted after trigger time", () => {
+      const reviews = [
+        createMockReview("2024-01-15T12:00:01Z"),
+        createMockReview("2024-01-15T13:00:00Z"),
+        createMockReview("2024-01-16T00:00:00Z"),
+      ];
+
+      const filtered = filterReviewsToTriggerTime(reviews, triggerTime);
+      expect(filtered.length).toBe(0);
+    });
+
+    it("should handle exact timestamp match", () => {
+      const review = createMockReview("2024-01-15T12:00:00Z");
+      const filtered = filterReviewsToTriggerTime([review], triggerTime);
+      // Reviews submitted exactly at trigger time should be excluded for security
+      expect(filtered.length).toBe(0);
+    });
+  });
+
+  describe("review edit time filtering", () => {
+    it("should include reviews edited before trigger time", () => {
+      const reviews = [
+        createMockReview("2024-01-15T10:00:00Z", "2024-01-15T11:00:00Z"),
+        createMockReview(
+          "2024-01-15T10:00:00Z",
+          undefined,
+          "2024-01-15T11:30:00Z",
+        ),
+        createMockReview(
+          "2024-01-15T10:00:00Z",
+          "2024-01-15T11:00:00Z",
+          "2024-01-15T11:30:00Z",
+        ),
+      ];
+
+      const filtered = filterReviewsToTriggerTime(reviews, triggerTime);
+      expect(filtered.length).toBe(3);
+      expect(filtered).toEqual(reviews);
+    });
+
+    it("should exclude reviews edited after trigger time", () => {
+      const reviews = [
+        createMockReview("2024-01-15T10:00:00Z", "2024-01-15T13:00:00Z"),
+        createMockReview(
+          "2024-01-15T10:00:00Z",
+          undefined,
+          "2024-01-15T13:00:00Z",
+        ),
+        createMockReview(
+          "2024-01-15T10:00:00Z",
+          "2024-01-15T11:00:00Z",
+          "2024-01-15T13:00:00Z",
+        ),
+      ];
+
+      const filtered = filterReviewsToTriggerTime(reviews, triggerTime);
+      expect(filtered.length).toBe(0);
+    });
+
+    it("should prioritize lastEditedAt over updatedAt", () => {
+      const review = createMockReview(
+        "2024-01-15T10:00:00Z",
+        "2024-01-15T13:00:00Z", // updatedAt after trigger
+        "2024-01-15T11:00:00Z", // lastEditedAt before trigger
+      );
+
+      const filtered = filterReviewsToTriggerTime([review], triggerTime);
+      // lastEditedAt takes precedence, so this should be included
+      expect(filtered.length).toBe(1);
+      expect(filtered[0]).toBe(review);
+    });
+
+    it("should handle reviews without edit timestamps", () => {
+      const review = createMockReview("2024-01-15T10:00:00Z");
+      expect(review.updatedAt).toBeUndefined();
+      expect(review.lastEditedAt).toBeUndefined();
+
+      const filtered = filterReviewsToTriggerTime([review], triggerTime);
+      expect(filtered.length).toBe(1);
+      expect(filtered[0]).toBe(review);
+    });
+
+    it("should exclude reviews edited exactly at trigger time", () => {
+      const reviews = [
+        createMockReview("2024-01-15T10:00:00Z", "2024-01-15T12:00:00Z"), // updatedAt exactly at trigger
+        createMockReview(
+          "2024-01-15T10:00:00Z",
+          undefined,
+          "2024-01-15T12:00:00Z",
+        ), // lastEditedAt exactly at trigger
+      ];
+
+      const filtered = filterReviewsToTriggerTime(reviews, triggerTime);
+      expect(filtered.length).toBe(0);
+    });
+  });
+
+  describe("edge cases", () => {
+    it("should return all reviews when no trigger time provided", () => {
+      const reviews = [
+        createMockReview("2024-01-15T10:00:00Z"),
+        createMockReview("2024-01-15T13:00:00Z"),
+        createMockReview("2024-01-16T00:00:00Z"),
+      ];
+
+      const filtered = filterReviewsToTriggerTime(reviews, undefined);
+      expect(filtered.length).toBe(3);
+      expect(filtered).toEqual(reviews);
+    });
+  });
+});
+
+describe("fetchGitHubData integration with time filtering", () => {
+  it("should filter comments based on trigger time when provided", async () => {
+    const mockOctokits = {
+      graphql: jest.fn().mockResolvedValue({
+        repository: {
+          issue: {
+            number: 123,
+            title: "Test Issue",
+            body: "Issue body",
+            author: { login: "author" },
+            comments: {
+              nodes: [
+                {
+                  id: "1",
+                  databaseId: "1",
+                  body: "Comment before trigger",
+                  author: { login: "user1" },
+                  createdAt: "2024-01-15T11:00:00Z",
+                  updatedAt: "2024-01-15T11:00:00Z",
+                },
+                {
+                  id: "2",
+                  databaseId: "2",
+                  body: "Comment after trigger",
+                  author: { login: "user2" },
+                  createdAt: "2024-01-15T13:00:00Z",
+                  updatedAt: "2024-01-15T13:00:00Z",
+                },
+                {
+                  id: "3",
+                  databaseId: "3",
+                  body: "Comment before but edited after",
+                  author: { login: "user3" },
+                  createdAt: "2024-01-15T11:00:00Z",
+                  updatedAt: "2024-01-15T13:00:00Z",
+                  lastEditedAt: "2024-01-15T13:00:00Z",
+                },
+              ],
+            },
+          },
+        },
+        user: { login: "trigger-user" },
+      }),
+      rest: jest.fn() as any,
+    };
+
+    const result = await fetchGitHubData({
+      octokits: mockOctokits as any,
+      repository: "test-owner/test-repo",
+      prNumber: "123",
+      isPR: false,
+      triggerUsername: "trigger-user",
+      triggerTime: "2024-01-15T12:00:00Z",
+    });
+
+    // Should only include the comment created before trigger time
+    expect(result.comments.length).toBe(1);
+    expect(result.comments[0]?.id).toBe("1");
+    expect(result.comments[0]?.body).toBe("Comment before trigger");
+  });
+
+  it("should filter PR reviews based on trigger time", async () => {
+    const mockOctokits = {
+      graphql: jest.fn().mockResolvedValue({
+        repository: {
+          pullRequest: {
+            number: 456,
+            title: "Test PR",
+            body: "PR body",
+            author: { login: "author" },
+            comments: { nodes: [] },
+            files: { nodes: [] },
+            reviews: {
+              nodes: [
+                {
+                  id: "1",
+                  databaseId: "1",
+                  author: { login: "reviewer1" },
+                  body: "Review before trigger",
+                  state: "APPROVED",
+                  submittedAt: "2024-01-15T11:00:00Z",
+                  comments: { nodes: [] },
+                },
+                {
+                  id: "2",
+                  databaseId: "2",
+                  author: { login: "reviewer2" },
+                  body: "Review after trigger",
+                  state: "CHANGES_REQUESTED",
+                  submittedAt: "2024-01-15T13:00:00Z",
+                  comments: { nodes: [] },
+                },
+                {
+                  id: "3",
+                  databaseId: "3",
+                  author: { login: "reviewer3" },
+                  body: "Review before but edited after",
+                  state: "COMMENTED",
+                  submittedAt: "2024-01-15T11:00:00Z",
+                  updatedAt: "2024-01-15T13:00:00Z",
+                  lastEditedAt: "2024-01-15T13:00:00Z",
+                  comments: { nodes: [] },
+                },
+              ],
+            },
+          },
+        },
+        user: { login: "trigger-user" },
+      }),
+      rest: {
+        pulls: {
+          listFiles: jest.fn().mockResolvedValue({ data: [] }),
+        },
+      },
+    };
+
+    const result = await fetchGitHubData({
+      octokits: mockOctokits as any,
+      repository: "test-owner/test-repo",
+      prNumber: "456",
+      isPR: true,
+      triggerUsername: "trigger-user",
+      triggerTime: "2024-01-15T12:00:00Z",
+    });
+
+    // The reviewData field returns all reviews (not filtered), but the filtering
+    // happens when processing review bodies for download
+    // We can check the image download map to verify filtering
+    expect(result.reviewData?.nodes?.length).toBe(3); // All reviews are returned
+
+    // Check that only the first review's body would be downloaded (filtered)
+    const reviewsInMap = Object.keys(result.imageUrlMap).filter((key) =>
+      key.startsWith("review_body"),
+    );
+    // Only review 1 should have its body processed (before trigger and not edited after)
+    expect(reviewsInMap.length).toBeLessThanOrEqual(1);
+  });
+
+  it("should filter review comments based on trigger time", async () => {
+    const mockOctokits = {
+      graphql: jest.fn().mockResolvedValue({
+        repository: {
+          pullRequest: {
+            number: 789,
+            title: "Test PR",
+            body: "PR body",
+            author: { login: "author" },
+            comments: { nodes: [] },
+            files: { nodes: [] },
+            reviews: {
+              nodes: [
+                {
+                  id: "1",
+                  databaseId: "1",
+                  author: { login: "reviewer" },
+                  body: "Review body",
+                  state: "COMMENTED",
+                  submittedAt: "2024-01-15T11:00:00Z",
+                  comments: {
+                    nodes: [
+                      {
+                        id: "10",
+                        databaseId: "10",
+                        body: "Review comment before",
+                        author: { login: "user1" },
+                        createdAt: "2024-01-15T11:30:00Z",
+                      },
+                      {
+                        id: "11",
+                        databaseId: "11",
+                        body: "Review comment after",
+                        author: { login: "user2" },
+                        createdAt: "2024-01-15T12:30:00Z",
+                      },
+                      {
+                        id: "12",
+                        databaseId: "12",
+                        body: "Review comment edited after",
+                        author: { login: "user3" },
+                        createdAt: "2024-01-15T11:30:00Z",
+                        lastEditedAt: "2024-01-15T12:30:00Z",
+                      },
+                    ],
+                  },
+                },
+              ],
+            },
+          },
+        },
+        user: { login: "trigger-user" },
+      }),
+      rest: {
+        pulls: {
+          listFiles: jest.fn().mockResolvedValue({ data: [] }),
+        },
+      },
+    };
+
+    const result = await fetchGitHubData({
+      octokits: mockOctokits as any,
+      repository: "test-owner/test-repo",
+      prNumber: "789",
+      isPR: true,
+      triggerUsername: "trigger-user",
+      triggerTime: "2024-01-15T12:00:00Z",
+    });
+
+    // The imageUrlMap contains processed comments for image downloading
+    // We should have processed review comments, but only those before trigger time
+    // The exact check depends on how imageUrlMap is structured, but we can verify
+    // that filtering occurred by checking the review data still has all nodes
+    expect(result.reviewData?.nodes?.length).toBe(1); // Original review is kept
+
+    // The actual filtering happens during processing for image download
+    // Since the mock doesn't actually download images, we verify the input was correct
+  });
+
+  it("should handle backward compatibility when no trigger time provided", async () => {
+    const mockOctokits = {
+      graphql: jest.fn().mockResolvedValue({
+        repository: {
+          issue: {
+            number: 999,
+            title: "Test Issue",
+            body: "Issue body",
+            author: { login: "author" },
+            comments: {
+              nodes: [
+                {
+                  id: "1",
+                  databaseId: "1",
+                  body: "Old comment",
+                  author: { login: "user1" },
+                  createdAt: "2024-01-15T11:00:00Z",
+                },
+                {
+                  id: "2",
+                  databaseId: "2",
+                  body: "New comment",
+                  author: { login: "user2" },
+                  createdAt: "2024-01-15T13:00:00Z",
+                },
+                {
+                  id: "3",
+                  databaseId: "3",
+                  body: "Edited comment",
+                  author: { login: "user3" },
+                  createdAt: "2024-01-15T11:00:00Z",
+                  lastEditedAt: "2024-01-15T13:00:00Z",
+                },
+              ],
+            },
+          },
+        },
+        user: { login: "trigger-user" },
+      }),
+      rest: jest.fn() as any,
+    };
+
+    const result = await fetchGitHubData({
+      octokits: mockOctokits as any,
+      repository: "test-owner/test-repo",
+      prNumber: "999",
+      isPR: false,
+      triggerUsername: "trigger-user",
+      // No triggerTime provided
+    });
+
+    // Without trigger time, all comments should be included
+    expect(result.comments.length).toBe(3);
+  });
+
+  it("should handle timezone variations in timestamps", async () => {
+    const mockOctokits = {
+      graphql: jest.fn().mockResolvedValue({
+        repository: {
+          issue: {
+            number: 321,
+            title: "Test Issue",
+            body: "Issue body",
+            author: { login: "author" },
+            comments: {
+              nodes: [
+                {
+                  id: "1",
+                  databaseId: "1",
+                  body: "Comment with UTC",
+                  author: { login: "user1" },
+                  createdAt: "2024-01-15T11:00:00Z",
+                },
+                {
+                  id: "2",
+                  databaseId: "2",
+                  body: "Comment with offset",
+                  author: { login: "user2" },
+                  createdAt: "2024-01-15T11:00:00+00:00",
+                },
+                {
+                  id: "3",
+                  databaseId: "3",
+                  body: "Comment with milliseconds",
+                  author: { login: "user3" },
+                  createdAt: "2024-01-15T11:00:00.000Z",
+                },
+              ],
+            },
+          },
+        },
+        user: { login: "trigger-user" },
+      }),
+      rest: jest.fn() as any,
+    };
+
+    const result = await fetchGitHubData({
+      octokits: mockOctokits as any,
+      repository: "test-owner/test-repo",
+      prNumber: "321",
+      isPR: false,
+      triggerUsername: "trigger-user",
+      triggerTime: "2024-01-15T12:00:00Z",
+    });
+
+    // All three comments should be included as they're all before trigger time
+    expect(result.comments.length).toBe(3);
+  });
+});