diff --git a/AGENTS.md b/AGENTS.md
index 5620b735fd..b197282a3c 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -46,6 +46,16 @@ The e2e tests require GitHub credentials. There are three ways to provide them:
 
 If only `E2E_GITHUB_USERNAME` and a password source are available, `make e2e-test` will automatically generate a session file before running tests. See `make help` for all available targets.
 
+## Agent definitions and skills
+
+Agent definitions, skills, harness configs, and related content have moved to
+[`fullsend-ai/agents`](https://github.com/fullsend-ai/agents). The copies under
+`internal/scaffold/fullsend-repo/` are stale and will be removed. Do not modify
+files under `internal/scaffold/fullsend-repo/agents/`,
+`internal/scaffold/fullsend-repo/skills/`, or
+`internal/scaffold/fullsend-repo/harness/` — make changes in
+`fullsend-ai/agents` instead.
+
 ## Forge abstraction
 
 All git forge operations (GitHub API calls, PR comments, issue creation, workflow dispatch, etc.) **must** go through the `forge.Client` interface defined in `internal/forge/forge.go`. This is a fundamental architectural rule — the codebase supports multiple forges (GitHub, GitLab, Forgejo) and direct coupling to any single forge breaks the abstraction.
diff --git a/internal/scaffold/fullsend-repo/agents/README.md b/internal/scaffold/fullsend-repo/agents/README.md
new file mode 100644
index 0000000000..dd1c87b2de
--- /dev/null
+++ b/internal/scaffold/fullsend-repo/agents/README.md
@@ -0,0 +1,4 @@
+# Deprecated
+
+This content has moved to [`fullsend-ai/agents`](https://github.com/fullsend-ai/agents).
+Do not modify files here — they are stale copies and will be removed.
diff --git a/internal/scaffold/fullsend-repo/harness/README.md b/internal/scaffold/fullsend-repo/harness/README.md
new file mode 100644
index 0000000000..8f4923abaf
--- /dev/null
+++ b/internal/scaffold/fullsend-repo/harness/README.md
@@ -0,0 +1,6 @@
+# Deprecated
+
+This content is being migrated to [`fullsend-ai/agents`](https://github.com/fullsend-ai/agents).
+These files are still embedded by Go code (`internal/scaffold/baseurl.go`), so
+changes here remain necessary until the Go references are updated. Once migrated,
+these copies will be removed.
diff --git a/internal/scaffold/fullsend-repo/skills/README.md b/internal/scaffold/fullsend-repo/skills/README.md
new file mode 100644
index 0000000000..dd1c87b2de
--- /dev/null
+++ b/internal/scaffold/fullsend-repo/skills/README.md
@@ -0,0 +1,4 @@
+# Deprecated
+
+This content has moved to [`fullsend-ai/agents`](https://github.com/fullsend-ai/agents).
+Do not modify files here — they are stale copies and will be removed.