fix(chat): include ongoing resource tradeoffs in tool advice

docs/product/use-cases/community/golden-queries.md

@@ -102,7 +102,7 @@ Do not score the mere presence of a tool call: inspect the answer and its result
 | ID | Natural request / 自然请求 | Observable acceptance |
 | --- | --- | --- |
 | CQ01 | 我已经用 Codex 做项目了，LoopX 能多解决什么？给一个能试的小例子，也说说现在的限制。 | Explains the division between host execution and persistent coordination, provides a small version-supported journey, and distinguishes shipped behavior from roadmap. A short answer invents no Goal. |
-| CQ02 | 我主要想跟踪开源项目、定期整理资料，偶尔修代码。哪些部分适合 LoopX，哪些直接用现有工具更简单？ | Maps requirements to supported paths, costs and limits; can recommend a simpler path. Does not assume every task needs a team or a new daemon. Any proposed external service has a concrete reason. |
+| CQ02 | 我主要想跟踪开源项目、定期整理资料，偶尔修代码。哪些部分适合 LoopX，哪些直接用现有工具更简单？ | Maps requirements to supported paths, costs and limits, including setup/maintenance effort and recurring execution/scheduling costs without invented prices or savings; can recommend a simpler path. Does not assume every task needs a team or a new daemon. Any proposed external service has a concrete reason. |
 | CQ03 | Goal、Todo、Session 和 Agent 分别管什么？为什么还需要 lease 和 quota？用一次中断后继续工作的例子解释。 | Checks current public docs/source, connects the concepts through one coherent journey, and distinguishes scheduling, ownership, conversation and completion evidence. Does not equate a nonempty evidence reference with a proven result. |
 | CQ04 | 我已有一个 LoopX 安装，想升级但保留原来的目标和配置。怎么查安装来源、升级和回退？ | Gives the supported commands for the supplied platform/version, checks CLI ownership and preserves state. No overlapping installation, blind reinstall or destructive reset. This guidance case changes no member machine. |
 | CQ05 | 这条发布说明说支持多 Agent 协作：我装的这个版本已经有了吗，还是只在 main？[版本与公开发布链接] | Compares the supplied installed release with public release/source facts; distinguishes merged, packaged, installed and live-qualified. No fabricated release date or inference from a PR title alone. |

loopx/chat_agent.py

@@ -536,6 +536,8 @@ def _turn_prompt(
             "Read applicable skills and reuse unchanged instruction reads; stop unrelated discovery when the requested facts have sufficient evidence. "
             "Inspect the implementation when documentation is insufficient, conflicts with the selected version, or the operator requests source verification. "
             "Answer directly with the needed version and source references. Explicit requests to change or execute project work still follow their existing authorized workflow. "
+            "When advising which tools or workflows to use, explain the decision-relevant setup and maintenance effort, recurring execution or scheduling costs, and limits. "
+            "Ground these tradeoffs in available evidence; state material unknowns rather than inventing prices or savings. "
             if not execution_mode else ""
         )
         + (