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review classifier: under ACP the prompt is a real system message

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The ACP runtime handed the classifier's system prompt to hive-runtime's
system_prompt_file, which prepends it to the first user message, so the
instructions and the PR text sat in the same user turn.

The rendered opencode.json now defines a review-classifier agent whose
prompt is {file:./system.md} and selects it with default_agent. opencode
1.15.10 sends an agent's prompt as the system-role message (in place of
its per-model default prompt), followed only by its environment block;
the first user message is the PR material alone. The API key runtime
keeps --system-prompt.

The agent carries no permission or tools key, and a test pins its exact
shape: opencode merges an agent's own permission after
OPENCODE_PERMISSION, so a permission there would offer tools again
(checked on real opencode: {"*":"allow"} on the agent offered all ten
tools despite OPENCODE_PERMISSION={"*":"deny"}).

Follow-up to #5214.
This commit is contained in:
atlas 2026-10-13 12:39:08 +02:00 • committed by mara
commit 6d42abb285
2 changed files with 50 additions and 7 deletions
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7
docs/swarm/review-classifier.md
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@ -133,7 +133,12 @@ deny every tool (`OPENCODE_PERMISSION={"*":"deny"}`), which leaves the model
with no tool offered at all, and refuses any permission request on top. The
config it writes for opencode names one provider and model, from the settings,
and turns off opencode's title call, which would send the prompt a second
time.
time. It also defines the agent the session runs as, whose prompt is the
classifier's system prompt, so opencode sends it as the system message, with
only its environment block (model, directory, platform, date) after it. The
first user message holds the PR alone. That agent has no `permission` of its
own: opencode merges an agent's permission over `OPENCODE_PERMISSION`, so one
there would offer the model tools again.
The service is `swarm-review-classifier`, and its container is the one
[`services.md`](services.md#review-classifier) describes. It holds no forge