diff --git a/PROTO.md b/PROTO.md
index c1a6480..f78e30c 100644
--- a/PROTO.md
+++ b/PROTO.md
@@ -40,8 +40,8 @@ gh_cli.py                # vendored async `gh` runner: binary resolution (PATH +
                          #   injection (config secret > env), check_gh_error CLASSIFICATION, bad_repo
 status.py                # the first-run probe: compute_status / summarize_status / report_gaps (setup-gap seam)
 projects.py              # repo sources: host projects: registry (ADR 0095) + checkout `origin` remote parsing
-read_tools.py            # 15 read tools (6 ported core + file/contents/pr-file/path-exists/pr-diff + status + list_prs/comments/search)
-write_tools.py           # 8 write tools (create/edit/merge/close/comment/labels/assignees) — gated
+read_tools.py            # 16 read tools (6 ported core + file/contents/pr-file/path-exists/pr-diff + status + list_prs/comments/search + review_threads)
+write_tools.py           # 10 write tools (create/edit/merge/close/comment/labels/assignees + reply/resolve review threads) — gated
 review_tools.py          # 3 verdict tools (comment/approve/request-changes, guarded) — gated
 gh_issue.py              # /issue chat command logic + repo resolution (resolve_repo, default_repo_error)
 api.py                   # routers — public PAGES (view/new-issue) + gated data routes (config/status/issues/prs/issue)
diff --git a/write_tools.py b/write_tools.py
index 1326eef..b0888dc 100644
--- a/write_tools.py
+++ b/write_tools.py
@@ -33,6 +33,8 @@
 
 from __future__ import annotations
 
+import re
+
 from langchain_core.tools import tool
 
 from .gh_cli import bad_repo, check_gh_error, parse_json, run_gh
@@ -50,7 +52,7 @@ def _pr_number(url: str) -> str:
     return tail if tail.isdigit() else ""
 
 
-_THREAD_ID_RE = __import__("re").compile(r"^PRRT_[A-Za-z0-9_-]{6,}$")
+_THREAD_ID_RE = re.compile(r"^PRRT_[A-Za-z0-9_-]{6,}$")
 
 
 def _bad_thread_id(thread_id: str) -> str | None: