Bug

/scheduler list (and any /scheduler subcommand) returns unknown command: /scheduler when invoked via ACP (e.g., from Zed/Helix/VS Code).

Root Cause

handle_prompt() in crates/zeph-acp/src/agent/mod.rs (line 1047) intercepts all inputs starting with / and routes them to the ACP-specific handle_slash_command(), except /compact and /model refresh which are explicitly excluded (lines 1048–1049) and passed through to the agent loop.

handle_slash_command() has a hardcoded match with {/help, /model, /review, /mode, /clear} and returns "unknown command: /scheduler" for anything else.

When PR #1648 added /scheduler list to the zeph-core agent loop's slash command handler, it was not added to the ACP exclusion list.

Fix

Add /scheduler to the ACP pass-through exclusion list alongside /compact:

if trimmed_text.starts_with('/')
    && trimmed_text != "/compact"
    && trimmed_text != "/model refresh"
    && !trimmed_text.starts_with("/scheduler")  // add this
{
    return self.handle_slash_command(&args.session_id, trimmed_text).await;
}

This allows /scheduler list to be forwarded to input_tx → agent loop → handle_scheduler_slash_command() where list_tasks tool is dispatched.

Reproduction

client.request("session/prompt", {
    "sessionId": sid,
    "prompt": [{"type": "text", "text": "/scheduler list"}],
})
# Returns: {"code": -32600, "message": "Invalid request", "data": "unknown command: /scheduler"}

Impact

/scheduler list and any future /scheduler subcommands are silently inaccessible from ACP clients. The list_tasks tool works correctly (LLM can call it) but the slash command shortcut does not.

Related

• PR feat(scheduler): add list_tasks tool and /scheduler list slash command #1648 (added /scheduler list)
• Missing /scheduler list built-in command #1423 (original feature request, marked closed by feat(scheduler): add list_tasks tool and /scheduler list slash command #1648 but ACP path broken)