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fix(acp): instruct model to treat ACP attached-file blocks as inline context #57509

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fix(acp): instruct model to treat ACP attached-file blocks as inline context #57509

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7 changes: 7 additions & 0 deletions agent/system_prompt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -381,6 +381,13 @@ def build_system_prompt_parts(agent: Any, system_message: Optional[str] = None)
f"after explicit direction."
)

# ACP attached-file context — the adapter inlines file content as text
# blocks. Tell the model to use it directly rather than trying to fetch.
stable_parts.append(
"`[Attached file: ...]` blocks contain the actual file — read the "
"content inline, do not call tools to fetch it."
)

platform_key = (agent.platform or "").lower().strip()
# Resolve the built-in/plugin default hint for this platform, then apply
# any per-platform override from config (platform_hints.<platform>).
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