fix(tag-mode): enabled inline PR comments alongside sticky comments

- added `mcp__github_inline_comment__create_inline_comment` to tag mode's
  allowed tools when the context is a PR
- the inline comment MCP server was previously only available in agent mode
  or when explicitly passed via `claude_args`, making it impossible to post
  review feedback on specific diff lines in tag mode
- this allows sticky comments (for the main tracking comment) and inline
  comments (for code-level review feedback) to coexist
- added tests verifying inline comments are excluded for non-PR contexts
  and that both comment servers work together with sticky comments enabled

closes #955

Author: sunnypatell

src/modes/tag/index.ts

@@ -131,6 +131,12 @@ export async function prepareTagMode({
     ...userAllowedMCPTools,
   ];
 
+  // Enable inline PR comments for PR contexts so Claude can post
+  // review feedback directly on diff lines alongside the tracking comment
+  if (context.isPR) {
+    tagModeTools.push("mcp__github_inline_comment__create_inline_comment");
+  }
+
   // Add git commands when using git CLI (no API commit signing, or SSH signing)
   // SSH signing still uses git CLI, just with signing enabled
   if (!useApiCommitSigning) {

test/install-mcp-server.test.ts

@@ -313,4 +313,47 @@ describe("prepareMcpConfig", () => {
     const parsed = JSON.parse(result);
     expect(parsed.mcpServers.github_ci).not.toBeDefined();
   });
+
+  test("should not include inline comment server for non-PR contexts", async () => {
+    const result = await prepareMcpConfig({
+      githubToken: "test-token",
+      owner: "test-owner",
+      repo: "test-repo",
+      branch: "test-branch",
+      baseBranch: "main",
+      allowedTools: ["mcp__github_inline_comment__create_inline_comment"],
+      mode: "tag",
+      context: mockContext, // isPR: false
+    });
+
+    const parsed = JSON.parse(result);
+    expect(parsed.mcpServers.github_inline_comment).not.toBeDefined();
+  });
+
+  test("should include inline comment server alongside sticky comment support for PRs", async () => {
+    const mockPRContextWithSticky: ParsedGitHubContext = {
+      ...mockPRContext,
+      inputs: {
+        ...mockPRContext.inputs,
+        useStickyComment: true,
+      },
+    };
+
+    const result = await prepareMcpConfig({
+      githubToken: "test-token",
+      owner: "test-owner",
+      repo: "test-repo",
+      branch: "test-branch",
+      baseBranch: "main",
+      allowedTools: ["mcp__github_inline_comment__create_inline_comment"],
+      mode: "tag",
+      context: mockPRContextWithSticky,
+    });
+
+    const parsed = JSON.parse(result);
+    // Both comment server (for sticky tracking comment) and inline comment server should coexist
+    expect(parsed.mcpServers.github_comment).toBeDefined();
+    expect(parsed.mcpServers.github_inline_comment).toBeDefined();
+    expect(parsed.mcpServers.github_inline_comment.env.PR_NUMBER).toBe("456");
+  });
 });