RULE
规则定边界 Rules set boundaries
保留当前有效的业务约束，过期版本必须移除或明确标记。 Keep the current business constraint; remove or clearly mark superseded versions.
01 · 行李箱装得下，不代表装得对
01 · Fitting is not packing well
只有 10 格预算时，你会带规则、旧聊天、关键证据，还是刚返回的工具结果？ With ten budget slots, do you pack rules, old chat, decisive evidence, or the latest tool result?
02 上下文预算箱：逐件取舍 Context Budget Box: Choose Item by Item
选材，不改窗口结构 curation, not capacity
预算占用
Budget used
10/10
tokens
问题覆盖
Coverage
100%
规则 + 事实 + 现状
rule + fact + current state
冲突
Conflicts
0
clean context
03 四类材料，四种职责 Four Material Types, Four Jobs
选择 · 组织 · 更新 select · organize · updateHISTORY
历史保连续 History preserves continuity
只留当前任务需要的决定与指代，不把整段聊天无差别塞回去。 Keep decisions and references needed now, not the entire conversation indiscriminately.
EVIDENCE
证据回答事实 Evidence answers facts
证据要相关、可追溯，并与问题中的关键判断直接对应。 Evidence should be relevant, traceable, and tied directly to the decision in question.
TOOL
工具结果给现状 Tools provide current state
把刚执行后的真实返回送回上下文，避免用旧猜测代替环境状态。 Feed back the actual result of an action instead of substituting an old guess for current state.
04 最小机制：价值必须覆盖成本与冲突 Minimal Mechanism: Value Must Beat Cost and Conflict
Σ tokens ≤ B
useful = coverage − conflict − overflow
B =
10。勾选材料会同时改变覆盖、冲突和超预算，不能只追求“塞得多”。
B = 10. Each selection changes coverage, conflict, and overflow;
maximizing volume is not the objective.
选择必要材料
Select necessary material
规则、证据、现状
rule, evidence, current state
检查预算与冲突
Check budget and conflict
旧摘要可能过期
old summary may be stale
压缩或移除
Compress or remove
让每个 token 有职责
make every token earn its place
05 边界实验：什么都舍不得删 Boundary Test: Refuse to Remove Anything
主动制造失败 Create a failure把过期历史也塞进预算箱 Pack stale history as well
全选后占用 14/10，旧摘要还与最新规则冲突。装得更多，覆盖没有增加，反而制造超限与版本冲突。 Selecting everything uses 14/10, while the old summary conflicts with current policy. More material adds overflow and version conflict without more coverage.
尚未执行。推荐组合正好占满 10 格。
Not run yet. The recommended set fills exactly ten slots.
✗ 上下文工程就是把提示写长。
Context engineering means writing a longer prompt.
→ ✓ 它还负责选择、组织、压缩和更新材料。
It also selects, organizes, compresses, and updates
material.
✗ 窗口放得下，就应全部放进去。
If the window fits it, include everything.
→ ✓ 容量是 S3 的上限；选材质量是 S6 的任务。
Capacity is the S3 limit; curation quality is the S6
job.
✗ 旧历史总能帮助保持连续。
Old history always improves continuity.
→ ✓ 过期摘要可能与当前规则直接冲突。
A stale summary may directly conflict with current
policy.
06 · 一句话带走
06 · One line to keep