diff --git a/.gitea/workflows/ai-agent.yml b/.gitea/workflows/ai-agent.yml
index 252f921..a795f82 100644
--- a/.gitea/workflows/ai-agent.yml
+++ b/.gitea/workflows/ai-agent.yml
@@ -1,6 +1,8 @@
 name: ai-agent
-# Thin caller so the agents work on THIS repo too (their own workflow). Same shared logic.
-# New issues opened by ffaerber auto-start @pm; @mention an agent in a comment to route on replies.
+# Standard caller for the shared AI-agent workflow (ffaerber/agents). Copy this file VERBATIM into
+# any repo that should get the agents — it is identical in every repo. All logic + scripts live in
+# agents/.gitea/workflows/; scripts are fetched from @main at run time. The `jobs.agent` wrapper is
+# required: a reusable (workflow_call) workflow can only be invoked from a caller job, not top-level.
 on:
   issue_comment:
     types: [created]
diff --git a/README.md b/README.md
index dbc02fc..268078a 100644
--- a/README.md
+++ b/README.md
@@ -29,10 +29,16 @@ detail out of agents that shouldn't act on it while still letting them know the
 
 ## Use it in a repo
 
-Add `.gitea/workflows/ai-agent.yml` to the consuming repo:
+**The standard caller is one file, identical in every repo.** Copy this repo's own
+[`.gitea/workflows/ai-agent.yml`](.gitea/workflows/ai-agent.yml) verbatim into the consuming repo —
+it is the source of truth, and `agents` itself uses the same file:
 
 ```yaml
 name: ai-agent
+# Standard caller for the shared AI-agent workflow (ffaerber/agents). Copy this file VERBATIM into
+# any repo that should get the agents — it is identical in every repo. All logic + scripts live in
+# agents/.gitea/workflows/; scripts are fetched from @main at run time. The `jobs.agent` wrapper is
+# required: a reusable (workflow_call) workflow can only be invoked from a caller job, not top-level.
 on:
   issue_comment:
     types: [created]
@@ -44,7 +50,9 @@ jobs:
     secrets: inherit
 ```
 
-That's the whole per-repo footprint. All the logic (agent registry, routing, delegation,
+That's the whole per-repo footprint, and it's the minimum a caller can be: the `on:` triggers must
+live in each repo (a reusable workflow can't declare its callers' triggers) and the `jobs.agent`
+wrapper is mandatory for `workflow_call`. Everything else (agent registry, routing, delegation,
 reactions, PR/issue plumbing) lives here in `agent.yml`.
 
 ## Repo layout