Revert to simple gt-mayor/gt-deacon session names

Reverts the session naming changes from PR #70. Multi-town support
on a single machine is not a real use case - rigs provide project
isolation, and true isolation should use containers/VMs.

Changes:
- MayorSessionName() and DeaconSessionName() no longer take townName parameter
- ParseSessionName() handles simple gt-mayor and gt-deacon formats
- Removed Town field from AgentIdentity and AgentSession structs
- Updated all callers and tests

Generated with Claude Code

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/agents.go

@@ -35,7 +35,6 @@ type AgentSession struct {
 	Type      AgentType
 	Rig       string // For rig-specific agents
 	AgentName string // e.g., crew name, polecat name
-	Town      string // For mayor/deacon only (town name from session)
 }
 
 // AgentTypeColors maps agent types to tmux color codes.
@@ -136,16 +135,13 @@ func categorizeSession(name string) *AgentSession {
 	session := &AgentSession{Name: name}
 	suffix := strings.TrimPrefix(name, "gt-")
 
-	// Town-level agents: gt-{town}-mayor, gt-{town}-deacon
-	// Check if suffix ends with -mayor or -deacon (new format)
-	if strings.HasSuffix(suffix, "-mayor") {
+	// Town-level agents: gt-mayor, gt-deacon (simple format, one per machine)
+	if suffix == "mayor" {
 		session.Type = AgentMayor
-		session.Town = strings.TrimSuffix(suffix, "-mayor")
 		return session
 	}
-	if strings.HasSuffix(suffix, "-deacon") {
+	if suffix == "deacon" {
 		session.Type = AgentDeacon
-		session.Town = strings.TrimSuffix(suffix, "-deacon")
 		return session
 	}
 

internal/cmd/deacon.go

@@ -21,18 +21,9 @@ import (
 	"github.com/steveyegge/gastown/internal/workspace"
 )
 
-// getDeaconSessionName returns the Deacon session name for the current workspace.
-// The session name includes the town name to avoid collisions between multiple HQs.
+// getDeaconSessionName returns the Deacon session name.
 func getDeaconSessionName() (string, error) {
-	townRoot, err := workspace.FindFromCwdOrError()
-	if err != nil {
-		return "", fmt.Errorf("not in a Gas Town workspace: %w", err)
-	}
-	townName, err := workspace.GetTownName(townRoot)
-	if err != nil {
-		return "", err
-	}
-	return session.DeaconSessionName(townName), nil
+	return session.DeaconSessionName(), nil
 }
 
 var deaconCmd = &cobra.Command{
@@ -673,14 +664,8 @@ func runDeaconHealthCheck(cmd *cobra.Command, args []string) error {
 		return nil
 	}
 
-	// Get town name for session name generation
-	townName, err := workspace.GetTownName(townRoot)
-	if err != nil {
-		return fmt.Errorf("getting town name: %w", err)
-	}
-
 	// Get agent bead info before ping (for baseline)
-	beadID, sessionName, err := agentAddressToIDs(agent, townName)
+	beadID, sessionName, err := agentAddressToIDs(agent)
 	if err != nil {
 		return fmt.Errorf("invalid agent address: %w", err)
 	}
@@ -787,14 +772,8 @@ func runDeaconForceKill(cmd *cobra.Command, args []string) error {
 			agent, remaining.Round(time.Second))
 	}
 
-	// Get town name for session name generation
-	townName, err := workspace.GetTownName(townRoot)
-	if err != nil {
-		return fmt.Errorf("getting town name: %w", err)
-	}
-
 	// Get session name
-	_, sessionName, err := agentAddressToIDs(agent, townName)
+	_, sessionName, err := agentAddressToIDs(agent)
 	if err != nil {
 		return fmt.Errorf("invalid agent address: %w", err)
 	}
@@ -1154,14 +1133,13 @@ func notifyMayorOfWitnessFailure(townRoot string, zombies []zombieInfo) {
 
 // agentAddressToIDs converts an agent address to bead ID and session name.
 // Supports formats: "gastown/polecats/max", "gastown/witness", "deacon", "mayor"
-// The townName parameter is required for mayor/deacon to generate correct session names.
-func agentAddressToIDs(address, townName string) (beadID, sessionName string, err error) {
+func agentAddressToIDs(address string) (beadID, sessionName string, err error) {
 	switch address {
 	case "deacon":
-		sessName := session.DeaconSessionName(townName)
+		sessName := session.DeaconSessionName()
 		return sessName, sessName, nil
 	case "mayor":
-		sessName := session.MayorSessionName(townName)
+		sessName := session.MayorSessionName()
 		return sessName, sessName, nil
 	}
 
@@ -1227,11 +1205,7 @@ func sendMail(townRoot, to, subject, body string) {
 
 // updateAgentBeadState updates an agent bead's state.
 func updateAgentBeadState(townRoot, agent, state, reason string) {
-	townName, err := workspace.GetTownName(townRoot)
-	if err != nil {
-		return
-	}
-	beadID, _, err := agentAddressToIDs(agent, townName)
+	beadID, _, err := agentAddressToIDs(agent)
 	if err != nil {
 		return
 	}

internal/cmd/dnd_test.go

@@ -5,13 +5,13 @@ import (
 )
 
 func TestAddressToAgentBeadID(t *testing.T) {
-	townName := "ai"
 	tests := []struct {
 		address  string
 		expected string
 	}{
-		{"mayor", "gt-ai-mayor"},
-		{"deacon", "gt-ai-deacon"},
+		// Mayor and deacon use simple session names (no town qualifier)
+		{"mayor", "gt-mayor"},
+		{"deacon", "gt-deacon"},
 		{"gastown/witness", "gt-gastown-witness"},
 		{"gastown/refinery", "gt-gastown-refinery"},
 		{"gastown/alpha", "gt-gastown-polecat-alpha"},
@@ -25,9 +25,9 @@ func TestAddressToAgentBeadID(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.address, func(t *testing.T) {
-			got := addressToAgentBeadID(tt.address, townName)
+			got := addressToAgentBeadID(tt.address)
 			if got != tt.expected {
-				t.Errorf("addressToAgentBeadID(%q, %q) = %q, want %q", tt.address, townName, got, tt.expected)
+				t.Errorf("addressToAgentBeadID(%q) = %q, want %q", tt.address, got, tt.expected)
 			}
 		})
 	}

internal/cmd/install.go

@@ -261,8 +261,8 @@ func createMayorCLAUDEmd(hqRoot, townRoot string) error {
 		TownRoot:      townRoot,
 		TownName:      townName,
 		WorkDir:       hqRoot,
-		MayorSession:  session.MayorSessionName(townName),
-		DeaconSession: session.DeaconSessionName(townName),
+		MayorSession:  session.MayorSessionName(),
+		DeaconSession: session.DeaconSessionName(),
 	}
 
 	content, err := tmpl.RenderRole("mayor", data)

internal/cmd/mayor.go

@@ -14,18 +14,9 @@ import (
 	"github.com/steveyegge/gastown/internal/workspace"
 )
 
-// getMayorSessionName returns the Mayor session name for the current workspace.
-// The session name includes the town name to avoid collisions between multiple HQs.
+// getMayorSessionName returns the Mayor session name.
 func getMayorSessionName() (string, error) {
-	townRoot, err := workspace.FindFromCwdOrError()
-	if err != nil {
-		return "", fmt.Errorf("not in a Gas Town workspace: %w", err)
-	}
-	townName, err := workspace.GetTownName(townRoot)
-	if err != nil {
-		return "", err
-	}
-	return session.MayorSessionName(townName), nil
+	return session.MayorSessionName(), nil
 }
 
 var mayorCmd = &cobra.Command{

internal/cmd/nudge.go

@@ -120,17 +120,11 @@ func runNudge(cmd *cobra.Command, args []string) error {
 
 	t := tmux.NewTmux()
 
-	// Get session names for this town
-	townName := ""
-	if townRoot != "" {
-		townName, _ = workspace.GetTownName(townRoot)
-	}
-
 	// Expand role shortcuts to session names
-	// These shortcuts let users type "mayor" instead of "gt-{town}-mayor"
+	// These shortcuts let users type "mayor" instead of "gt-mayor"
 	switch target {
 	case "mayor":
-		target = session.MayorSessionName(townName)
+		target = session.MayorSessionName()
 	case "witness", "refinery":
 		// These need the current rig
 		roleInfo, err := GetRole()
@@ -149,7 +143,7 @@ func runNudge(cmd *cobra.Command, args []string) error {
 
 	// Special case: "deacon" target maps to the Deacon session
 	if target == "deacon" {
-		deaconSession := session.DeaconSessionName(townName)
+		deaconSession := session.DeaconSessionName()
 		// Check if Deacon session exists
 		exists, err := t.HasSession(deaconSession)
 		if err != nil {
@@ -286,9 +280,6 @@ func runNudgeChannel(channelName, message string) error {
 	// Prefix message with sender
 	prefixedMessage := fmt.Sprintf("[from %s] %s", sender, message)
 
-	// Get town name for session names
-	townName, _ := workspace.GetTownName(townRoot)
-
 	// Get all running sessions for pattern matching
 	agents, err := getAgentSessions(true)
 	if err != nil {
@@ -300,7 +291,7 @@ func runNudgeChannel(channelName, message string) error {
 	seenTargets := make(map[string]bool)
 
 	for _, pattern := range patterns {
-		resolved := resolveNudgePattern(pattern, agents, townName)
+		resolved := resolveNudgePattern(pattern, agents)
 		for _, sessionName := range resolved {
 			if !seenTargets[sessionName] {
 				seenTargets[sessionName] = true
@@ -362,15 +353,15 @@ func runNudgeChannel(channelName, message string) error {
 //   - Role: "*/witness" → all witness sessions
 //   - Special: "mayor", "deacon" → gt-{town}-mayor, gt-{town}-deacon
 // townName is used to generate the correct session names for mayor/deacon.
-func resolveNudgePattern(pattern string, agents []*AgentSession, townName string) []string {
+func resolveNudgePattern(pattern string, agents []*AgentSession) []string {
 	var results []string
 
 	// Handle special cases
 	switch pattern {
 	case "mayor":
-		return []string{session.MayorSessionName(townName)}
+		return []string{session.MayorSessionName()}
 	case "deacon":
-		return []string{session.DeaconSessionName(townName)}
+		return []string{session.DeaconSessionName()}
 	}
 
 	// Parse pattern
@@ -438,11 +429,8 @@ func shouldNudgeTarget(townRoot, targetAddress string, force bool) (bool, string
 		return true, "", nil
 	}
 
-	// Get town name for session name generation
-	townName, _ := workspace.GetTownName(townRoot)
-
 	// Try to determine agent bead ID from address
-	agentBeadID := addressToAgentBeadID(targetAddress, townName)
+	agentBeadID := addressToAgentBeadID(targetAddress)
 	if agentBeadID == "" {
 		// Can't determine agent bead, allow the nudge
 		return true, "", nil
@@ -467,13 +455,13 @@ func shouldNudgeTarget(townRoot, targetAddress string, force bool) (bool, string
 //   - "gastown/alpha" -> "gt-gastown-polecat-alpha"
 //
 // Returns empty string if the address cannot be converted.
-func addressToAgentBeadID(address, townName string) string {
+func addressToAgentBeadID(address string) string {
 	// Handle special cases
 	switch address {
 	case "mayor":
-		return session.MayorSessionName(townName)
+		return session.MayorSessionName()
 	case "deacon":
-		return session.DeaconSessionName(townName)
+		return session.DeaconSessionName()
 	}
 
 	// Parse rig/role format

internal/cmd/nudge_test.go

@@ -5,10 +5,10 @@ import (
 )
 
 func TestResolveNudgePattern(t *testing.T) {
-	// Create test agent sessions
+	// Create test agent sessions (no Town field for mayor/deacon anymore)
 	agents := []*AgentSession{
-		{Name: "gt-ai-mayor", Type: AgentMayor, Town: "ai"},
-		{Name: "gt-ai-deacon", Type: AgentDeacon, Town: "ai"},
+		{Name: "gt-mayor", Type: AgentMayor},
+		{Name: "gt-deacon", Type: AgentDeacon},
 		{Name: "gt-gastown-witness", Type: AgentWitness, Rig: "gastown"},
 		{Name: "gt-gastown-refinery", Type: AgentRefinery, Rig: "gastown"},
 		{Name: "gt-gastown-crew-max", Type: AgentCrew, Rig: "gastown", AgentName: "max"},
@@ -27,12 +27,12 @@ func TestResolveNudgePattern(t *testing.T) {
 		{
 			name:     "mayor special case",
 			pattern:  "mayor",
-			expected: []string{"gt-ai-mayor"},
+			expected: []string{"gt-mayor"},
 		},
 		{
 			name:     "deacon special case",
 			pattern:  "deacon",
-			expected: []string{"gt-ai-deacon"},
+			expected: []string{"gt-deacon"},
 		},
 		{
 			name:     "specific witness",
@@ -86,10 +86,9 @@ func TestResolveNudgePattern(t *testing.T) {
 		},
 	}
 
-	townName := "ai"
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got := resolveNudgePattern(tt.pattern, agents, townName)
+			got := resolveNudgePattern(tt.pattern, agents)
 
 			if len(got) != len(tt.expected) {
 				t.Errorf("resolveNudgePattern(%q) returned %d results, want %d: got %v, want %v",

internal/cmd/prime.go

@@ -315,8 +315,8 @@ func outputPrimeContext(ctx RoleContext) error {
 		TownName:      townName,
 		WorkDir:       ctx.WorkDir,
 		Polecat:       ctx.Polecat,
-		MayorSession:  session.MayorSessionName(townName),
-		DeaconSession: session.DeaconSessionName(townName),
+		MayorSession:  session.MayorSessionName(),
+		DeaconSession: session.DeaconSessionName(),
 	}
 
 	// Render and output

internal/cmd/statusline_test.go

@@ -31,8 +31,8 @@ func TestCategorizeSessionRig(t *testing.T) {
 		{"gt-a-b", "a"}, // minimum valid
 
 		// Town-level agents (no rig)
-		{"gt-ai-mayor", ""},
-		{"gt-ai-deacon", ""},
+		{"gt-mayor", ""},
+		{"gt-deacon", ""},
 	}
 
 	for _, tt := range tests {
@@ -68,8 +68,8 @@ func TestCategorizeSessionType(t *testing.T) {
 		{"gt-myrig-crew-user", AgentCrew},
 
 		// Town-level agents
-		{"gt-ai-mayor", AgentMayor},
-		{"gt-ai-deacon", AgentDeacon},
+		{"gt-mayor", AgentMayor},
+		{"gt-deacon", AgentDeacon},
 	}
 
 	for _, tt := range tests {

internal/cmd/theme.go

@@ -117,15 +117,9 @@ func runThemeApply(cmd *cobra.Command, args []string) error {
 	// Determine current rig
 	rigName := detectCurrentRig()
 
-	// Get town name for session name comparison
-	var mayorSession, deaconSession string
-	townRoot, err := workspace.FindFromCwd()
-	if err == nil && townRoot != "" {
-		if townName, err := workspace.GetTownName(townRoot); err == nil {
-			mayorSession = session.MayorSessionName(townName)
-			deaconSession = session.DeaconSessionName(townName)
-		}
-	}
+	// Get session names for comparison
+	mayorSession := session.MayorSessionName()
+	deaconSession := session.DeaconSessionName()
 
 	// Apply to matching sessions
 	applied := 0

internal/constants/constants.go

@@ -90,8 +90,8 @@ const (
 )
 
 // Tmux session names.
-// Note: Mayor and Deacon session names are now dynamic (include town name).
-// Use session.MayorSessionName(townName) and session.DeaconSessionName(townName).
+// Mayor and Deacon use simple session names: gt-mayor, gt-deacon (one per machine).
+// Use session.MayorSessionName() and session.DeaconSessionName().
 const (
 	// SessionPrefix is the prefix for all Gas Town tmux sessions.
 	SessionPrefix = "gt-"

internal/daemon/daemon.go

@@ -22,7 +22,6 @@ import (
 	"github.com/steveyegge/gastown/internal/polecat"
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/tmux"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // Daemon is the town-level background service.
@@ -198,13 +197,7 @@ const DeaconRole = "deacon"
 
 // getDeaconSessionName returns the Deacon session name for the daemon's town.
 func (d *Daemon) getDeaconSessionName() string {
-	townName, err := workspace.GetTownName(d.config.TownRoot)
-	if err != nil {
-		// Fallback to legacy name if town config can't be loaded
-		d.logger.Printf("Warning: failed to get town name: %v, using fallback", err)
-		return "gt-deacon"
-	}
-	return session.DeaconSessionName(townName)
+	return session.DeaconSessionName()
 }
 
 // ensureBootRunning spawns Boot to triage the Deacon.

internal/daemon/lifecycle.go

@@ -14,7 +14,6 @@ import (
 	"github.com/steveyegge/gastown/internal/constants"
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/tmux"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // BeadsMessage represents a message from gt mail inbox --json.
@@ -313,15 +312,9 @@ func (d *Daemon) identityToSession(identity string) string {
 	// Fallback: use default patterns based on role type
 	switch parsed.RoleType {
 	case "mayor":
-		if townName, err := workspace.GetTownName(d.config.TownRoot); err == nil {
-			return session.MayorSessionName(townName)
-		}
-		return ""
+		return session.MayorSessionName()
 	case "deacon":
-		if townName, err := workspace.GetTownName(d.config.TownRoot); err == nil {
-			return session.DeaconSessionName(townName)
-		}
-		return ""
+		return session.DeaconSessionName()
 	case "witness", "refinery":
 		return fmt.Sprintf("gt-%s-%s", parsed.RigName, parsed.RoleType)
 	case "crew":

internal/daemon/lifecycle_test.go

@@ -184,9 +184,10 @@ func TestIdentityToSession_Mayor(t *testing.T) {
 	d, cleanup := testDaemonWithTown(t, "ai")
 	defer cleanup()
 
+	// Mayor session name is now fixed (one per machine, no town qualifier)
 	result := d.identityToSession("mayor")
-	if result != "gt-ai-mayor" {
-		t.Errorf("identityToSession('mayor') = %q, expected 'gt-ai-mayor'", result)
+	if result != "gt-mayor" {
+		t.Errorf("identityToSession('mayor') = %q, expected 'gt-mayor'", result)
 	}
 }
 

internal/doctor/lifecycle_check.go

@@ -9,7 +9,6 @@ import (
 	"strings"
 
 	"github.com/steveyegge/gastown/internal/session"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // LifecycleHygieneCheck detects and cleans up stale lifecycle state.
@@ -243,12 +242,7 @@ func (c *LifecycleHygieneCheck) isSessionHealthy(identity, townRoot string) bool
 func identityToSessionName(identity, townRoot string) string {
 	switch identity {
 	case "mayor":
-		if townRoot != "" {
-			if townName, err := workspace.GetTownName(townRoot); err == nil {
-				return session.MayorSessionName(townName)
-			}
-		}
-		return "" // Cannot generate session name without town root
+		return session.MayorSessionName()
 	default:
 		if strings.HasSuffix(identity, "-witness") ||
 			strings.HasSuffix(identity, "-refinery") ||

internal/doctor/orphan_check.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/tmux"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // OrphanSessionCheck detects orphaned tmux sessions that don't match
@@ -57,12 +56,9 @@ func (c *OrphanSessionCheck) Run(ctx *CheckContext) *CheckResult {
 	// Get list of valid rigs
 	validRigs := c.getValidRigs(ctx.TownRoot)
 
-	// Get dynamic session names for mayor/deacon
-	var mayorSession, deaconSession string
-	if townName, err := workspace.GetTownName(ctx.TownRoot); err == nil {
-		mayorSession = session.MayorSessionName(townName)
-		deaconSession = session.DeaconSessionName(townName)
-	}
+	// Get session names for mayor/deacon
+	mayorSession := session.MayorSessionName()
+	deaconSession := session.DeaconSessionName()
 
 	// Check each session
 	var orphans []string

internal/doctor/tmux_check.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/tmux"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // LinkedPaneCheck detects tmux sessions that share panes,
@@ -86,11 +85,7 @@ func (c *LinkedPaneCheck) Run(ctx *CheckContext) *CheckResult {
 	}
 
 	// Cache for Fix (exclude mayor session since we don't want to kill it)
-	// Get dynamic mayor session name
-	var mayorSession string
-	if townName, err := workspace.GetTownName(ctx.TownRoot); err == nil {
-		mayorSession = session.MayorSessionName(townName)
-	}
+	mayorSession := session.MayorSessionName()
 
 	c.linkedSessions = nil
 	for sess := range linkedSessionSet {

internal/mail/router.go

@@ -13,7 +13,6 @@ import (
 	"github.com/steveyegge/gastown/internal/config"
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/tmux"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // ErrUnknownList indicates a mailing list name was not found in configuration.
@@ -936,13 +935,7 @@ func (r *Router) GetMailbox(address string) (*Mailbox, error) {
 // Uses send-keys to echo a visible banner to ensure notification is seen.
 // Supports mayor/, rig/polecat, and rig/refinery addresses.
 func (r *Router) notifyRecipient(msg *Message) error {
-	// Get town name for session name generation
-	var townName string
-	if r.townRoot != "" {
-		townName, _ = workspace.GetTownName(r.townRoot)
-	}
-
-	sessionID := addressToSessionID(msg.To, townName)
+	sessionID := addressToSessionID(msg.To)
 	if sessionID == "" {
 		return nil // Unable to determine session ID
 	}
@@ -959,21 +952,15 @@ func (r *Router) notifyRecipient(msg *Message) error {
 
 // addressToSessionID converts a mail address to a tmux session ID.
 // Returns empty string if address format is not recognized.
-func addressToSessionID(address, townName string) string {
+func addressToSessionID(address string) string {
 	// Mayor address: "mayor/" or "mayor"
 	if strings.HasPrefix(address, "mayor") {
-		if townName != "" {
-			return session.MayorSessionName(townName)
-		}
-		return "" // Cannot generate session name without town name
+		return session.MayorSessionName()
 	}
 
 	// Deacon address: "deacon/" or "deacon"
 	if strings.HasPrefix(address, "deacon") {
-		if townName != "" {
-			return session.DeaconSessionName(townName)
-		}
-		return "" // Cannot generate session name without town name
+		return session.DeaconSessionName()
 	}
 
 	// Rig-based address: "rig/target"

internal/mail/router_test.go

@@ -87,14 +87,13 @@ func TestIsTownLevelAddress(t *testing.T) {
 }
 
 func TestAddressToSessionID(t *testing.T) {
-	townName := "ai"
 	tests := []struct {
 		address string
 		want    string
 	}{
-		{"mayor", "gt-ai-mayor"},
-		{"mayor/", "gt-ai-mayor"},
-		{"deacon", "gt-ai-deacon"},
+		{"mayor", "gt-mayor"},
+		{"mayor/", "gt-mayor"},
+		{"deacon", "gt-deacon"},
 		{"gastown/refinery", "gt-gastown-refinery"},
 		{"gastown/Toast", "gt-gastown-Toast"},
 		{"beads/witness", "gt-beads-witness"},
@@ -105,9 +104,9 @@ func TestAddressToSessionID(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.address, func(t *testing.T) {
-			got := addressToSessionID(tt.address, townName)
+			got := addressToSessionID(tt.address)
 			if got != tt.want {
-				t.Errorf("addressToSessionID(%q, %q) = %q, want %q", tt.address, townName, got, tt.want)
+				t.Errorf("addressToSessionID(%q) = %q, want %q", tt.address, got, tt.want)
 			}
 		})
 	}

internal/session/identity.go

@@ -21,7 +21,6 @@ const (
 // AgentIdentity represents a parsed Gas Town agent identity.
 type AgentIdentity struct {
 	Role Role   // mayor, deacon, witness, refinery, crew, polecat
-	Town string // town name (for mayor/deacon only)
 	Rig  string // rig name (empty for mayor/deacon)
 	Name string // crew/polecat name (empty for mayor/deacon/witness/refinery)
 }
@@ -29,8 +28,8 @@ type AgentIdentity struct {
 // ParseSessionName parses a tmux session name into an AgentIdentity.
 //
 // Session name formats:
-//   - gt-<town>-mayor → Role: mayor, Town: <town>
-//   - gt-<town>-deacon → Role: deacon, Town: <town>
+//   - gt-mayor → Role: mayor (one per machine)
+//   - gt-deacon → Role: deacon (one per machine)
 //   - gt-<rig>-witness → Role: witness, Rig: <rig>
 //   - gt-<rig>-refinery → Role: refinery, Rig: <rig>
 //   - gt-<rig>-crew-<name> → Role: crew, Rig: <rig>, Name: <name>
@@ -49,20 +48,18 @@ func ParseSessionName(session string) (*AgentIdentity, error) {
 		return nil, fmt.Errorf("invalid session name %q: empty after prefix", session)
 	}
 
-	// Parse into parts
-	parts := strings.Split(suffix, "-")
-	if len(parts) < 2 {
-		return nil, fmt.Errorf("invalid session name %q: expected town-role or rig-role format", session)
+	// Check for simple town-level roles (no rig qualifier)
+	if suffix == "mayor" {
+		return &AgentIdentity{Role: RoleMayor}, nil
+	}
+	if suffix == "deacon" {
+		return &AgentIdentity{Role: RoleDeacon}, nil
 	}
 
-	// Check for mayor/deacon (town-level roles with suffix marker)
-	if parts[len(parts)-1] == "mayor" {
-		town := strings.Join(parts[:len(parts)-1], "-")
-		return &AgentIdentity{Role: RoleMayor, Town: town}, nil
-	}
-	if parts[len(parts)-1] == "deacon" {
-		town := strings.Join(parts[:len(parts)-1], "-")
-		return &AgentIdentity{Role: RoleDeacon, Town: town}, nil
+	// Parse into parts for rig-level roles
+	parts := strings.Split(suffix, "-")
+	if len(parts) < 2 {
+		return nil, fmt.Errorf("invalid session name %q: expected rig-role format", session)
 	}
 
 	// Check for witness/refinery (suffix markers)
@@ -97,9 +94,9 @@ func ParseSessionName(session string) (*AgentIdentity, error) {
 func (a *AgentIdentity) SessionName() string {
 	switch a.Role {
 	case RoleMayor:
-		return MayorSessionName(a.Town)
+		return MayorSessionName()
 	case RoleDeacon:
-		return DeaconSessionName(a.Town)
+		return DeaconSessionName()
 	case RoleWitness:
 		return WitnessSessionName(a.Rig)
 	case RoleRefinery:

internal/session/identity_test.go

@@ -6,38 +6,23 @@ import (
 
 func TestParseSessionName(t *testing.T) {
 	tests := []struct {
-		name        string
-		session     string
-		wantRole    Role
-		wantTown    string
-		wantRig     string
-		wantName    string
-		wantErr     bool
+		name     string
+		session  string
+		wantRole Role
+		wantRig  string
+		wantName string
+		wantErr  bool
 	}{
-		// Town-level roles (mayor/deacon with town name)
+		// Town-level roles (simple gt-mayor, gt-deacon)
 		{
-			name:     "mayor simple town",
-			session:  "gt-ai-mayor",
+			name:     "mayor",
+			session:  "gt-mayor",
 			wantRole: RoleMayor,
-			wantTown: "ai",
 		},
 		{
-			name:     "mayor hyphenated town",
-			session:  "gt-my-town-mayor",
-			wantRole: RoleMayor,
-			wantTown: "my-town",
-		},
-		{
-			name:     "deacon simple town",
-			session:  "gt-alpha-deacon",
+			name:     "deacon",
+			session:  "gt-deacon",
 			wantRole: RoleDeacon,
-			wantTown: "alpha",
-		},
-		{
-			name:     "deacon hyphenated town",
-			session:  "gt-my-town-deacon",
-			wantRole: RoleDeacon,
-			wantTown: "my-town",
 		},
 
 		// Witness (simple rig)
@@ -138,9 +123,6 @@ func TestParseSessionName(t *testing.T) {
 			if got.Role != tt.wantRole {
 				t.Errorf("ParseSessionName(%q).Role = %v, want %v", tt.session, got.Role, tt.wantRole)
 			}
-			if got.Town != tt.wantTown {
-				t.Errorf("ParseSessionName(%q).Town = %v, want %v", tt.session, got.Town, tt.wantTown)
-			}
 			if got.Rig != tt.wantRig {
 				t.Errorf("ParseSessionName(%q).Rig = %v, want %v", tt.session, got.Rig, tt.wantRig)
 			}
@@ -158,19 +140,14 @@ func TestAgentIdentity_SessionName(t *testing.T) {
 		want     string
 	}{
 		{
-			name:     "mayor with town",
-			identity: AgentIdentity{Role: RoleMayor, Town: "ai"},
-			want:     "gt-ai-mayor",
+			name:     "mayor",
+			identity: AgentIdentity{Role: RoleMayor},
+			want:     "gt-mayor",
 		},
 		{
-			name:     "mayor hyphenated town",
-			identity: AgentIdentity{Role: RoleMayor, Town: "my-town"},
-			want:     "gt-my-town-mayor",
-		},
-		{
-			name:     "deacon with town",
-			identity: AgentIdentity{Role: RoleDeacon, Town: "alpha"},
-			want:     "gt-alpha-deacon",
+			name:     "deacon",
+			identity: AgentIdentity{Role: RoleDeacon},
+			want:     "gt-deacon",
 		},
 		{
 			name:     "witness",
@@ -253,8 +230,8 @@ func TestAgentIdentity_Address(t *testing.T) {
 func TestParseSessionName_RoundTrip(t *testing.T) {
 	// Test that parsing then reconstructing gives the same result
 	sessions := []string{
-		"gt-ai-mayor",
-		"gt-alpha-deacon",
+		"gt-mayor",
+		"gt-deacon",
 		"gt-gastown-witness",
 		"gt-foo-bar-refinery",
 		"gt-gastown-crew-max",

internal/session/names.go

@@ -12,17 +12,15 @@ import (
 const Prefix = "gt-"
 
 // MayorSessionName returns the session name for the Mayor agent.
-// The townName parameter allows multiple towns to run concurrently
-// without tmux session name collisions.
-func MayorSessionName(townName string) string {
-	return fmt.Sprintf("%s%s-mayor", Prefix, townName)
+// One mayor per machine - multi-town requires containers/VMs for isolation.
+func MayorSessionName() string {
+	return Prefix + "mayor"
 }
 
 // DeaconSessionName returns the session name for the Deacon agent.
-// The townName parameter allows multiple towns to run concurrently
-// without tmux session name collisions.
-func DeaconSessionName(townName string) string {
-	return fmt.Sprintf("%s%s-deacon", Prefix, townName)
+// One deacon per machine - multi-town requires containers/VMs for isolation.
+func DeaconSessionName() string {
+	return Prefix + "deacon"
 }
 
 // WitnessSessionName returns the session name for a rig's Witness agent.

internal/session/names_test.go

@@ -8,42 +8,20 @@ import (
 )
 
 func TestMayorSessionName(t *testing.T) {
-	tests := []struct {
-		townName string
-		want     string
-	}{
-		{"ai", "gt-ai-mayor"},
-		{"alpha", "gt-alpha-mayor"},
-		{"gastown", "gt-gastown-mayor"},
-		{"", "gt--mayor"}, // empty town name
-	}
-	for _, tt := range tests {
-		t.Run(tt.townName, func(t *testing.T) {
-			got := MayorSessionName(tt.townName)
-			if got != tt.want {
-				t.Errorf("MayorSessionName(%q) = %q, want %q", tt.townName, got, tt.want)
-			}
-		})
+	// Mayor session name is now fixed (one per machine)
+	want := "gt-mayor"
+	got := MayorSessionName()
+	if got != want {
+		t.Errorf("MayorSessionName() = %q, want %q", got, want)
 	}
 }
 
 func TestDeaconSessionName(t *testing.T) {
-	tests := []struct {
-		townName string
-		want     string
-	}{
-		{"ai", "gt-ai-deacon"},
-		{"alpha", "gt-alpha-deacon"},
-		{"gastown", "gt-gastown-deacon"},
-		{"", "gt--deacon"}, // empty town name
-	}
-	for _, tt := range tests {
-		t.Run(tt.townName, func(t *testing.T) {
-			got := DeaconSessionName(tt.townName)
-			if got != tt.want {
-				t.Errorf("DeaconSessionName(%q) = %q, want %q", tt.townName, got, tt.want)
-			}
-		})
+	// Deacon session name is now fixed (one per machine)
+	want := "gt-deacon"
+	got := DeaconSessionName()
+	if got != want {
+		t.Errorf("DeaconSessionName() = %q, want %q", got, want)
 	}
 }