1 files changed, 65 insertions, 0 deletions
diff --git a/internal/task/validator.go b/internal/task/validator.go
new file mode 100644
index 0000000..ea0b1c2
--- /dev/null
+++ b/internal/task/validator.go
@@ -0,0 +1,65 @@
+package task
+
+import (
+	"fmt"
+	"strings"
+)
+
+// ValidationError collects multiple validation failures.
+type ValidationError struct {
+	Errors []string
+}
+
+func (e *ValidationError) Error() string {
+	return fmt.Sprintf("validation failed: %s", strings.Join(e.Errors, "; "))
+}
+
+func (e *ValidationError) Add(msg string) {
+	e.Errors = append(e.Errors, msg)
+}
+
+func (e *ValidationError) HasErrors() bool {
+	return len(e.Errors) > 0
+}
+
+// Validate checks a task for required fields and valid values.
+func Validate(t *Task) error {
+	ve := &ValidationError{}
+
+	if t.Name == "" {
+		ve.Add("name is required")
+	}
+	if t.Claude.Instructions == "" {
+		ve.Add("claude.instructions is required")
+	}
+	if t.Claude.MaxBudgetUSD < 0 {
+		ve.Add("claude.max_budget_usd must be non-negative")
+	}
+	if t.Timeout.Duration < 0 {
+		ve.Add("timeout must be non-negative")
+	}
+	if t.Retry.MaxAttempts < 1 {
+		ve.Add("retry.max_attempts must be at least 1")
+	}
+	if t.Retry.Backoff != "" && t.Retry.Backoff != "linear" && t.Retry.Backoff != "exponential" {
+		ve.Add("retry.backoff must be 'linear' or 'exponential'")
+	}
+	validPriorities := map[Priority]bool{PriorityHigh: true, PriorityNormal: true, PriorityLow: true}
+	if t.Priority != "" && !validPriorities[t.Priority] {
+		ve.Add(fmt.Sprintf("invalid priority %q; must be high, normal, or low", t.Priority))
+	}
+	if t.Claude.PermissionMode != "" {
+		validModes := map[string]bool{
+			"default": true, "acceptEdits": true, "bypassPermissions": true,
+			"plan": true, "dontAsk": true, "delegate": true,
+		}
+		if !validModes[t.Claude.PermissionMode] {
+			ve.Add(fmt.Sprintf("invalid permission_mode %q", t.Claude.PermissionMode))
+		}
+	}
+
+	if ve.HasErrors() {
+		return ve
+	}
+	return nil
+}