feat(agents): inject team members into system prompt

Team agents now see a ## Team Members section listing all teammates with
agent_key, display_name, role, and frontmatter excerpt. This allows the
agent to correctly assign tasks via team_tasks instead of guessing keys.

internal/agent/loop_history.go

@@ -159,6 +159,14 @@ func (l *Loop) buildMessages(ctx context.Context, history []providers.Message, s
 		mcpToolDescs = nil
 	}
 
+	// Resolve team members so agent knows who to assign tasks to.
+	var teamMembers []store.TeamMemberData
+	if hasTeamTools && l.teamStore != nil && l.agentUUID != uuid.Nil {
+		if team, _ := l.teamStore.GetTeamForAgent(ctx, l.agentUUID); team != nil {
+			teamMembers, _ = l.teamStore.ListMembers(ctx, team.ID)
+		}
+	}
+
 	systemPrompt := BuildSystemPrompt(SystemPromptConfig{
 		AgentID:                l.id,
 		Model:                  l.model,
@@ -174,6 +182,7 @@ func (l *Loop) buildMessages(ctx context.Context, history []providers.Message, s
 		HasSpawn:               l.tools != nil && hasSpawn,
 		HasTeam:                hasTeamTools,
 		TeamWorkspace:          tools.ToolTeamWorkspaceFromCtx(ctx),
+		TeamMembers:            teamMembers,
 		HasSkillSearch:         hasSkillSearch,
 		HasSkillManage:         l.skillEvolve && hasSkillManage,
 		HasMCPToolSearch:       hasMCPToolSearch,

internal/agent/systemprompt.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/nextlevelbuilder/goclaw/internal/bootstrap"
+	"github.com/nextlevelbuilder/goclaw/internal/store"
 	"github.com/nextlevelbuilder/goclaw/internal/tools"
 )
 
@@ -35,6 +36,7 @@ type SystemPromptConfig struct {
 	HasSpawn      bool                   // spawn tool available?
 	HasTeam        bool                   // agent belongs to a team? (skips generic spawn section)
 	TeamWorkspace  string                 // absolute path to team shared workspace (empty if not in team)
+	TeamMembers    []store.TeamMemberData // team member roster for task assignment
 	ContextFiles  []bootstrap.ContextFile // bootstrap files for # Project Context
 	ExtraPrompt   string                 // extra system prompt (subagent context, etc.)
 	AgentType     string                 // "open" or "predefined" — affects context file framing
@@ -225,6 +227,11 @@ func BuildSystemPrompt(cfg SystemPromptConfig) string {
 		lines = append(lines, buildTeamWorkspaceSection(cfg.TeamWorkspace)...)
 	}
 
+	// 6.4. ## Team Members — inject roster so agent knows who to assign tasks to
+	if !cfg.IsBootstrap && len(cfg.TeamMembers) > 0 {
+		lines = append(lines, buildTeamMembersSection(cfg.TeamMembers)...)
+	}
+
 	// 6.5 ## Sandbox (matching TS sandboxInfo section) — skip during bootstrap
 	if !cfg.IsBootstrap && cfg.SandboxEnabled {
 		lines = append(lines, buildSandboxSection(cfg)...)

internal/agent/systemprompt_sections.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/nextlevelbuilder/goclaw/internal/bootstrap"
+	"github.com/nextlevelbuilder/goclaw/internal/store"
 )
 
 // mcpToolDescMaxLen is the max character length for MCP tool descriptions
@@ -377,3 +378,30 @@ func buildTeamWorkspaceSection(teamWsPath string) []string {
 		"",
 	}
 }
+
+// buildTeamMembersSection lists team members so the agent knows who to assign tasks to.
+func buildTeamMembersSection(members []store.TeamMemberData) []string {
+	lines := []string{
+		"## Team Members",
+		"",
+		"Your team (use agent_key as assignee in team_tasks):",
+	}
+	for _, m := range members {
+		entry := fmt.Sprintf("- %s (%s) [%s]", m.AgentKey, m.DisplayName, m.Role)
+		if m.Frontmatter != "" {
+			fm := m.Frontmatter
+			if len([]rune(fm)) > 80 {
+				fm = string([]rune(fm)[:80]) + "…"
+			}
+			entry += " — " + fm
+		}
+		lines = append(lines, entry)
+	}
+	lines = append(lines,
+		"",
+		"When creating tasks with team_tasks, set assignee to the agent_key of the best-suited member.",
+		"Do NOT invent agent keys — only use the keys listed above.",
+		"",
+	)
+	return lines
+}