fix(canvas): 云端 Agent - 参数错误有限重试并折叠中间失败

backend/internal/app/cloud_agent_tool_repair.go

@@ -0,0 +1,62 @@
+package app
+
+import (
+	"errors"
+	"fmt"
+
+	"infinite-canvas/backend/internal/model"
+)
+
+const cloudAgentToolAttemptLimit = 3
+
+type cloudAgentToolRepair struct {
+	GroupID string `json:"groupId"`
+	Attempt int    `json:"attempt"`
+}
+
+// Count per tool, not per model step: intervening reads must not reset a failed
+// write's allowance. Only explicitly typed, pre-execution errors are repairable.
+func cloudAgentTrackToolRepair(runID string, state *cloudAgentRuntime, call cloudAgentCall, result any, err error, payload map[string]any) bool {
+	previous, exists := state.ToolRepairs[call.Function.Name]
+	if err == nil {
+		if exists {
+			payload["retry"] = map[string]any{"groupId": previous.GroupID, "attempt": previous.Attempt, "maxAttempts": cloudAgentToolAttemptLimit, "status": "recovered"}
+			delete(state.ToolRepairs, call.Function.Name)
+		}
+		return false
+	}
+	detail, _ := result.(map[string]any)
+	var argumentErr *cloudAgentArgumentError
+	if !errors.As(err, &argumentErr) || detail["taskSubmitted"] == true || detail["phase"] == "completion" {
+		return false
+	}
+	if state.ToolRepairs == nil {
+		state.ToolRepairs = map[string]cloudAgentToolRepair{}
+	}
+	if !exists {
+		previous.GroupID = runID + ":repair:" + call.ID
+	}
+	previous.Attempt++
+	state.ToolRepairs[call.Function.Name] = previous
+	exhausted := previous.Attempt >= cloudAgentToolAttemptLimit
+	status := "retrying"
+	if exhausted {
+		status = "exhausted"
+	}
+	retry := map[string]any{"groupId": previous.GroupID, "attempt": previous.Attempt, "maxAttempts": cloudAgentToolAttemptLimit, "status": status}
+	payload["retry"], detail["retry"] = retry, retry
+	return exhausted
+}
+
+func cloudAgentRecordToolResult(run *model.CloudAgentExecution, state *cloudAgentRuntime, call cloudAgentCall, result any, err error) {
+	if !cloudAgentToolResult(run.ID, state, call, result, err) {
+		return
+	}
+	run.Status = "failed"
+	run.FailureMessage = truncateRunes(fmt.Sprintf("自动纠正已尝试 %d 次，仍未完成：%s", cloudAgentToolAttemptLimit, cloudAgentSafeToolError(err)), 1000)
+	cloudAgentDropInterjections(run.ID, "本轮已结束："+truncateRunes(run.FailureMessage, 120), state)
+	state.event(run.ID, "run_failed", map[string]any{
+		"text": run.FailureMessage, "reason": "tool_retry_exhausted", "toolName": call.Function.Name,
+		"callId": call.ID, "attempts": cloudAgentToolAttemptLimit,
+	})
+}