diff --git a/docs/implementer-lessons.md b/docs/implementer-lessons.md
index 47c5416..ac90ca2 100644
--- a/docs/implementer-lessons.md
+++ b/docs/implementer-lessons.md
@@ -65,6 +65,8 @@ How it is used:
 | T27 | Every wait in a given test has a limit (`recv_timeout`, a deadline loop, `is_finished` before `join`). A test that waits forever on a broken implementation hangs the driver instead of failing, and the implementer cannot tell a hang from slowness. | M4a planning: breaking the reference's ping made `ws_conn` hang on `rx.recv()`; retrying a refused token made the serve test hang on `join()`. Both now fail within 5 s. |
 | T28 | Before hand-over, break the reference on purpose, one line at a time (drop a check, move a bound by one, skip a save), and run the given tests against each change. A change the tests still pass is a missing test, unless it cannot change behaviour. Rustfmt reflows lines: match on text that survives formatting. | M4a planning: 69 changes over six modules; the tests missed 8. Five were real gaps and got tests (a reconnect that re-sent "interrupted" for a running turn was one), two could not change behaviour, and one was left (an event frame with another id, which `loopd` never sends). |
 
+| T29 | Check a skeleton's comments, not only its code. Print every `todo!()` beside its signature and read each pair before hand-over. Filling the bodies from your own code proves the split can pass; it cannot show that a comment sits on the wrong function. Edit comments by function, never by "the next comment after this name". And tell the implementer to stop and quote a comment that does not fit. | M4a task 14, second session: `post`'s comment was `now_ms`'s text, put there by a script; Ornith saw the contradiction and deliberated over it until the turn ran out. |
+
 ## What worked and should be kept
 
 - Byte-exact fixtures, compared in both directions. No wire-format defect reached review.
diff --git a/docs/plans/M4a/14-gatewayd-serve.md b/docs/plans/M4a/14-gatewayd-serve.md
index 7a51a20..0c1b14f 100644
--- a/docs/plans/M4a/14-gatewayd-serve.md
+++ b/docs/plans/M4a/14-gatewayd-serve.md
@@ -107,6 +107,8 @@ never set.
 
 ## Stop and report if
 
+- A comment above a `todo!()` does not fit its function, or contradicts a test. The comments were
+  written by hand and one was wrong before; stop at once and quote it, rather than guess.
 - A test passes only sometimes, or a test takes 5 s or more (that is a wait that timed out, not a
   pass).
 - A written function (`run`, `connect`, `Gateway::new`, `event_loop`, `catch_up`) seems to need a
diff --git a/docs/plans/M4a/15-gatewayd-main.md b/docs/plans/M4a/15-gatewayd-main.md
index f5f3881..923d118 100644
--- a/docs/plans/M4a/15-gatewayd-main.md
+++ b/docs/plans/M4a/15-gatewayd-main.md
@@ -54,4 +54,5 @@ This is the last task of M4a. Stop after the commit.
 
 ## Stop and report if
 
+- The comment above the `todo!()` does not fit the function, or contradicts a test: quote it.
 - A test's output contains the token.
diff --git a/docs/plans/M4a/README.md b/docs/plans/M4a/README.md
index 16d1ecb..e9cdc73 100644
--- a/docs/plans/M4a/README.md
+++ b/docs/plans/M4a/README.md
@@ -90,6 +90,15 @@ At the end of task 15: about 762 tests (650 before task 01).
   checked in a scratch copy of the branch at task 14's start: the skeletons compile and fail
   (`serve` 6, `serve_restart` 5 with 2 passing, `main` 4 with 1 passing), and filled from their
   comments they pass (five runs), clippy clean, gate ok. Resume from task 14.
+- 2026-09-24, task 14 again: this session copied the files and saw the tests fail, as told, then
+  deliberated until cut off, over a real contradiction: `post`'s comment was `now_ms`'s text.
+  The design model's script that rewrote the comments placed each after the first
+  eight-space comment following the function's name; `now_ms` is a free function with a
+  four-space comment, so its text went to `post`, and `post`'s was lost. The check filled the
+  bodies from the design model's own code, not from the comments, so it could not see this.
+  Both comments are fixed; every `todo!()` comment in tasks 14 and 15 was then read beside its
+  signature. Tasks 14 and 15 now say to stop and quote a comment that does not fit. The attempt is
+  saved in `.state/runs/M4a/14-second-attempt*`. Resume from task 14.
 
 ## Running it
 
diff --git a/docs/plans/M4a/files/crates/gatewayd/src/serve/handle.rs b/docs/plans/M4a/files/crates/gatewayd/src/serve/handle.rs
index e8fe0ee..538b9a8 100644
--- a/docs/plans/M4a/files/crates/gatewayd/src/serve/handle.rs
+++ b/docs/plans/M4a/files/crates/gatewayd/src/serve/handle.rs
@@ -14,15 +14,17 @@ use crate::ws::conn::Ws;
 
 /// Now, in Mattermost's milliseconds.
 fn now_ms() -> i64 {
-    // Milliseconds since the Unix epoch as i64, with try_from (i64::MAX if it does not fit).
+    // `let ms = SystemTime::now().duration_since(UNIX_EPOCH).map(|d| d.as_millis()).unwrap_or(0);`
+    // then `i64::try_from(ms).unwrap_or(i64::MAX)`.
     todo!()
 }
 
 impl Gateway {
     /// Post in a thread; a failure is logged, not fatal.
     pub(super) fn post(&self, channel: &str, root: &str, text: &str) {
-        // `SystemTime::now().duration_since(UNIX_EPOCH).map(|d| d.as_millis()).unwrap_or(0)`, then
-        // `i64::try_from(ms).unwrap_or(i64::MAX)`.
+        // `if let Err(e) = self.client.create_post(channel, root, text)`: log
+        //    "gatewayd: cannot post in <channel> (thread <root>): <e>", with `(self.log)(&line)`.
+        // Nothing else: posting records nothing in the state.
         todo!()
     }