feat: Deny team_message tool for team leads and update string truncation to handle Unicode characters.

internal/agent/resolver.go

@@ -160,6 +160,7 @@ func NewManagedResolver(deps ResolverDeps) ResolverFunc {
 		// Inject TEAM.md for all team members (lead + members) so every agent
 		// knows the team workflow: create/claim/complete tasks via team_tasks tool.
 		hasTeam := false
+		isTeamLead := false
 		if deps.TeamStore != nil {
 			hasTeamMD := false
 			for _, cf := range contextFiles {
@@ -176,6 +177,13 @@ func NewManagedResolver(deps ResolverDeps) ResolverFunc {
 							Path:    bootstrap.TeamFile,
 							Content: buildTeamMD(team, members, ag.ID),
 						})
+						// Detect lead role for tool policy
+						for _, m := range members {
+							if m.AgentID == ag.ID && m.Role == store.TeamRoleLead {
+								isTeamLead = true
+								break
+							}
+						}
 					}
 				}
 			} else {
@@ -325,7 +333,7 @@ func NewManagedResolver(deps ResolverDeps) ResolverFunc {
 			Sessions:               deps.Sessions,
 			Tools:                  toolsReg,
 			ToolPolicy:             deps.ToolPolicy,
-			AgentToolPolicy:        agentToolPolicyWithMCP(ag.ParseToolsConfig(), hasMCPTools),
+			AgentToolPolicy:        agentToolPolicyForTeam(agentToolPolicyWithMCP(ag.ParseToolsConfig(), hasMCPTools), isTeamLead),
 			SkillsLoader:           deps.Skills,
 			SkillAllowList:         skillAllowList,
 			HasMemory:              hasMemory,

internal/agent/resolver_helpers.go

@@ -145,7 +145,6 @@ func buildTeamMD(team *store.TeamData, members []store.TeamMemberData, selfID uu
 		sb.WriteString("- action=search, query=<text> → search tasks by subject/description\n")
 		sb.WriteString("- action=complete, task_id=<id>, result=<summary> → manually complete a task\n")
 		sb.WriteString("- action=cancel, task_id=<id>, reason=<why> → cancel a pending task that is no longer needed\n\n")
-		sb.WriteString("Use `team_message` to send updates to team members.\n\n")
 		sb.WriteString("For simple questions about team composition, answer directly from the member list above.\n")
 	} else {
 		sb.WriteString("As a member, when you receive a delegated task, just do the work.\n")
@@ -156,13 +155,32 @@ func buildTeamMD(team *store.TeamData, members []store.TeamMemberData, selfID uu
 		sb.WriteString("- action=list → check team task board (active tasks)\n")
 		sb.WriteString("- action=get, task_id=<id> → read a completed task's full result\n")
 		sb.WriteString("- action=search, query=<text> → search tasks\n\n")
-		sb.WriteString("Use `team_message` to send updates to your team lead.\n\n")
+		sb.WriteString("Use `team_message` to send progress updates to your team lead (one-way, no response expected).\n\n")
 		sb.WriteString("For simple questions about team composition, answer directly from the member list above.\n")
 	}
 
 	return sb.String()
 }
 
+// agentToolPolicyForTeam denies team_message for team leads.
+// Leads should use spawn (which auto-announces results back) instead of team_message
+// (one-way notification that leaks raw responses to the output channel).
+func agentToolPolicyForTeam(policy *config.ToolPolicySpec, isLead bool) *config.ToolPolicySpec {
+	if !isLead {
+		return policy
+	}
+	if policy == nil {
+		policy = &config.ToolPolicySpec{}
+	}
+	for _, d := range policy.Deny {
+		if d == "team_message" {
+			return policy
+		}
+	}
+	policy.Deny = append(policy.Deny, "team_message")
+	return policy
+}
+
 // agentToolPolicyWithMCP injects "group:mcp" into the agent's alsoAllow list
 // when MCP tools are loaded, ensuring the PolicyEngine doesn't block them.
 func agentToolPolicyWithMCP(policy *config.ToolPolicySpec, hasMCP bool) *config.ToolPolicySpec {

internal/tools/delegate_async.go

@@ -166,8 +166,8 @@ func (dm *DelegateManager) DelegateAsync(ctx context.Context, opts DelegateOpts)
 				var announceSummaries []protocol.DelegationAnnounceResultSummary
 				for _, r := range artifacts.Results {
 					preview := r.Content
-					if len(preview) > 200 {
-						preview = preview[:200] + "..."
+					if runes := []rune(preview); len(runes) > 200 {
+						preview = string(runes[:200]) + "..."
 					}
 					announceSummaries = append(announceSummaries, protocol.DelegationAnnounceResultSummary{
 						AgentKey:       r.AgentKey,

internal/tools/delegate_events.go

@@ -100,8 +100,8 @@ func formatDelegateAnnounce(task *DelegationTask, artifacts *DelegateArtifacts,
 		if len(r.Deliverables) > 0 {
 			for _, d := range r.Deliverables {
 				preview := d
-				if len(preview) > 4000 {
-					preview = preview[:4000] + "\n[...truncated, full content in team_tasks]"
+				if runes := []rune(preview); len(runes) > 4000 {
+					preview = string(runes[:4000]) + "\n[...truncated, full content in team_tasks]"
 				}
 				msg += fmt.Sprintf("\n[Deliverable]\n%s\n", preview)
 			}