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fix(delegate): add explicit do-not-use guidance to acp_command/acp_args schema (carve-out of #22680)

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acp_command / acp_args descriptions previously primed the model to
populate them — "Per-task ACP command override (e.g. 'copilot')" —
even when no ACP CLI was installed. Models with weaker schema-following
discipline would set them and the spawn would fail.

Add explicit "Do NOT set unless the user has explicitly told you"
guidance at both the top-level acp_command and the per-task override.
Strengthen acp_args to mention it's empty unless acp_command is set.
Adds 2 tests pinning the descriptions.

Note: this is a cosmetic prompt-engineering fix — the params remain
exposed in the schema. The fully-correct fix is to gate them behind
a config flag or runtime ACP-CLI detection so the schema only emits
them when an ACP harness is available. Tracked as a follow-up; this
PR ships the low-cost stopgap.

Salvage of #22680 (delegate schema only). The original PR also
bundled unrelated fixes for #22548, #21944, #22150 — those
need separate PRs since #22548 and #21944 are already addressed
on main (#22780 + #22798 in flight) and #22150 deserves its own
review.

Closes #22013.
This commit is contained in:
Wesley Simplicio 2026-05-09 13:22:25 -07:00 • committed by Teknium
parent 1c9ffb177c
commit ca13993217
2 changed files with 38 additions and 4 deletions
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16
tools/delegate_tool.py
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@ -2681,12 +2681,16 @@ DELEGATE_TASK_SCHEMA = {
},
"acp_command": {
"type": "string",
"description": "Per-task ACP command override (e.g. 'copilot'). Overrides the top-level acp_command for this task only.",
"description": (
"Per-task ACP command override (e.g. 'copilot'). "
"Overrides the top-level acp_command for this task only. "
"Do NOT set unless the user explicitly told you an ACP CLI is installed."
),
},
"acp_args": {
"type": "array",
"items": {"type": "string"},
"description": "Per-task ACP args override.",
"description": "Per-task ACP args override. Leave empty unless acp_command is set.",
},
"role": {
"type": "string",
@ -2713,7 +2717,10 @@ DELEGATE_TASK_SCHEMA = {
"When set, children use ACP subprocess transport instead of inheriting "
"the parent's transport. Requires an ACP-compatible CLI "
"(currently GitHub Copilot CLI via 'copilot --acp --stdio'). "
"See agent/copilot_acp_client.py for the implementation."
"See agent/copilot_acp_client.py for the implementation. "
"IMPORTANT: Do NOT set this unless the user has explicitly told you "
"a specific ACP-compatible CLI is installed and configured. "
"Leave empty to use the parent's default transport (Hermes subagents)."
),
},
"acp_args": {
@ -2721,7 +2728,8 @@ DELEGATE_TASK_SCHEMA = {
"items": {"type": "string"},
"description": (
"Arguments for the ACP command (default: ['--acp', '--stdio']). "
"Only used when acp_command is set."
"Only used when acp_command is set. "
"Leave empty unless acp_command is explicitly provided."
),
},
},