diff --git a/askcc/definitions.py b/askcc/definitions.py
index 7cfc36a..ff52f50 100644
--- a/askcc/definitions.py
+++ b/askcc/definitions.py
@@ -467,6 +467,12 @@
 - Check out the PR branch using `gh pr checkout <number>` to inspect the full source.
 - Run the project's test suite to confirm all tests pass.
 
+Pre-merge guard (CHANGES_REQUESTED):
+- Before merging, check for unresolved CHANGES_REQUESTED reviews using \
+`gh pr view <number> -R <owner/repo> --json reviews --jq '[.reviews[] | select(.state == "CHANGES_REQUESTED")]'`.
+- If any CHANGES_REQUESTED reviews exist, DO NOT merge. Instead, address the requested changes, \
+reply to all inline comments, push a follow-up fix commit on the PR branch, and re-request review.
+
 Definition of Done checklist:
 1. **Acceptance criteria** — verify each criterion from the issue is satisfied by the code changes.
 2. **Test coverage** — new and changed logic has unit tests. Look for untested code paths.
diff --git a/pyproject.toml b/pyproject.toml
index f1f4719..c7bde45 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "askcc"
-version = "0.2.7"
+version = "0.2.8"
 description = "A one-shot cc cli executor"
 authors = [{ name = "mknt", email = "shane.cousins@gmail.com" }]
 readme = "README.md"
diff --git a/tests/test_askcc.py b/tests/test_askcc.py
index 68bc945..2d6e2e5 100644
--- a/tests/test_askcc.py
+++ b/tests/test_askcc.py
@@ -13,6 +13,7 @@
 from askcc.definitions import (
     AGENT_CONFIGS,
     DEVELOP_AGENT_PROMPT,
+    REVIEWPR_AGENT_PROMPT,
     AgentAction,
     AgentConfig,
     SupportedLanguage,
@@ -278,6 +279,25 @@ def test_removes_legacy_write_tests_line(self):
         assert "Write tests for every new or changed behavior" not in DEVELOP_AGENT_PROMPT
 
 
+class TestReviewprPromptMergeGuard:
+    """The pr-review prompt must block merging when CHANGES_REQUESTED reviews exist (issue #86)."""
+
+    def test_includes_changes_requested_check_command(self):
+        assert (
+            "gh pr view <number> -R <owner/repo> --json reviews --jq '[.reviews[] "
+            '| select(.state == "CHANGES_REQUESTED")]\'' in REVIEWPR_AGENT_PROMPT
+        )
+
+    def test_includes_do_not_merge_instruction(self):
+        assert "DO NOT merge" in REVIEWPR_AGENT_PROMPT
+
+    def test_includes_address_inline_comments_instruction(self):
+        assert "reply to all inline comments" in REVIEWPR_AGENT_PROMPT
+
+    def test_includes_pre_merge_guard_heading(self):
+        assert "Pre-merge guard" in REVIEWPR_AGENT_PROMPT
+
+
 class TestWritePromptContent:
     def test_writes_file_with_correct_name(self):
         filepath = write_prompt_content("plan", "monkut", "askcc-cli", 42, "issue content here")
diff --git a/uv.lock b/uv.lock
index 2f73f54..dc9f9d5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -4,7 +4,7 @@ requires-python = "==3.14.*"
 
 [[package]]
 name = "askcc"
-version = "0.2.7"
+version = "0.2.8"
 source = { editable = "." }
 
 [package.dev-dependencies]