weichenandCursor
6fd1d441a9
Why: Old tool results were filling the window, compaction could split a tool group or commit a stale summary, and reminders arrived as extra user messages. Evidence: Compaction retries a conflict and opens the circuit after three failures; clearing keeps the last five tool results; a stale file write is rejected; RPC reports started, queued, or handled. Impact: Requests over the context window replace older tool results with a placeholder. Rewriting an existing file now requires a read in the same run. Subagent text over 32000 characters is capped. Refs: feature/context-engineering Co-authored-by: Cursor <cursoragent@cursor.com>
71 lines
2.0 KiB
Go
71 lines
2.0 KiB
Go
package session
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import "agent-native/runtime/llm"
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const (
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// DefaultKeepToolResults 是运行内清理时保留的最近工具结果条数。
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DefaultKeepToolResults = 5
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// DefaultContextWindow 是未配置模型窗口时的保守字符数。
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DefaultContextWindow = 32000
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// DefaultOutputReserve 是留给模型输出的字符预留。
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DefaultOutputReserve = 4096
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// DefaultContextBuffer 是窗口估算的余量，避免贴着上限才清理。
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DefaultContextBuffer = 1024
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)
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// EstimateChars 用字符数近似这次请求的体积。
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func EstimateChars(msgs []llm.Message) int {
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n := 0
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for _, m := range msgs {
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n += len([]rune(m.Content))
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for _, c := range m.ToolCalls {
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n += len([]rune(c.Name)) + len([]rune(c.Arguments))
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}
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}
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return n
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}
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// NeedsClear 在估算超过「窗口 − 输出预留 − 缓冲」时返回真。
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// window ≤ 0 时用保守默认值。
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func NeedsClear(estimate, window, outputReserve, buffer int) bool {
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if window <= 0 {
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window = DefaultContextWindow
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}
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room := window - outputReserve - buffer
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if room < 1 {
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room = 1
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}
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return estimate > room
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}
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// ClearOldToolResults 把最近 keep 条之前的工具结果换成占位。
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// 消息条数、顺序和 tool_call 配对都不变；占位写明完整结果仍在会话记录里。
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// keep ≤ 0 时保留默认的 5 条。返回的切片不与输入共享被改写的消息。
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func ClearOldToolResults(msgs []llm.Message, keep int) []llm.Message {
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if keep <= 0 {
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keep = DefaultKeepToolResults
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}
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out := append([]llm.Message{}, msgs...)
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var toolIdx []int
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for i, m := range out {
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if m.Role == llm.RoleTool {
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toolIdx = append(toolIdx, i)
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}
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}
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if len(toolIdx) <= keep {
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return out
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}
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for _, i := range toolIdx[:len(toolIdx)-keep] {
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name := out[i].Name
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if name == "" {
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name = "工具"
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}
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loc := "会话记录"
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if out[i].ToolCallID != "" {
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loc = "会话记录中的调用 " + out[i].ToolCallID
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}
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out[i].Content = "旧工具结果已清理。完整内容见" + loc + "（" + name + "）。"
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}
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return out
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}
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