Commit: Update Agents.md on required commit trailers

[Christian Brabandt]

Update Agents.md on required commit trailers

Commit: https://github.com/vim/vim/commit/d705ad0535e0c6ee20236a13cedffd0acde801d3
Author: Christian Brabandt <c...@256bit.org>
Date: Mon Sep 28 19:57:39 2026 +0000

Update Agents.md on required commit trailers

related: https://github.com/vim/vim/issues/21318
closes: https://github.com/vim/vim/issues/21371

Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/AGENTS.md b/AGENTS.md
index 291c07900..b8e595713 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -88,6 +88,7 @@ one-sentence **problem statement**, not a description of the fix:
related: #NNNN
closes: #NNNN

+ Assisted-by: <AI tool>
Co-authored-by: Name
Signed-off-by: Author Name <email>

@@ -105,10 +106,11 @@ Rules:
**`related:` references related issues**, including issues that caused this
one.
All can appear. Colon, aligned, no trailing period.
-- **`Signed-off-by:` is required** — DCO.
-- **`Co-Authored-By:` is allowed** and is the accepted way to
- acknowledge AI assistance transparently. Human
- coauthors should usually also have their own Signed-off-by.
+- **`Signed-off-by:` is required** for the Developer Certificate of Origin (DCO).
+- **`Co-Authored-by:` is allowed** and is the accepted way to
+ acknowledge human assistance transparently. Human coauthors should usually
+ also have their own Signed-off-by.
+- **`Assisted-by:` is required** when AI was used.

## C code conventions