feat: upgrade to SDK v0.5.0 — new tools, effort control, fallback model

SDK v0.5.0 brings massive feature parity with TypeScript SDK:

New built-in tools (auto-registered):
- EnterPlanMode / ExitPlanMode
- TeamCreate / TeamDelete / SendMessage
- EnterWorktree / ExitWorktree
- CronCreate / CronDelete / CronList
- LSP (grep-based fallback)
- NotebookEdit
- ListMcpResources / ReadMcpResource
- Config / TodoWrite

New agent.Options fields wired:
- Effort (low/medium/high/max) via /effort command
- FallbackModel from config
- DisallowedTools from config
- EnableFileCheckpointing from config

New SDK packages available:
- session/ — full session management
- plugins/ — plugin system
- checkpoint/ — file state tracking
- contextusage/ — context window tracking
- ratelimit/ — API rate limiting
- sandbox/ — security sandbox

51 slash commands, 6300+ lines Go

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: idoubi

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/charmbracelet/bubbletea v1.3.5
 	github.com/charmbracelet/glamour v0.9.1
 	github.com/charmbracelet/lipgloss v1.1.0
-	github.com/codeany-ai/open-agent-sdk-go v0.4.1
+	github.com/codeany-ai/open-agent-sdk-go v0.5.0
 	github.com/muesli/reflow v0.3.0
 	github.com/spf13/cobra v1.9.1
 	gopkg.in/yaml.v3 v3.0.1

go.sum

@@ -32,8 +32,8 @@ github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91 h1:payR
 github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
 github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
 github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
-github.com/codeany-ai/open-agent-sdk-go v0.4.1 h1:sifjkB79SwgiJDDTaU65whTtKoddisT2i0zkQ68m04Y=
-github.com/codeany-ai/open-agent-sdk-go v0.4.1/go.mod h1:j9P9/i2oWLD0iMB73vZ6IllaQ9FzgG0LAdPmnqb9VOw=
+github.com/codeany-ai/open-agent-sdk-go v0.5.0 h1:UJd5HwlB01udnIHnYAimO1iOXqkItofNSuGMH5keT00=
+github.com/codeany-ai/open-agent-sdk-go v0.5.0/go.mod h1:j9P9/i2oWLD0iMB73vZ6IllaQ9FzgG0LAdPmnqb9VOw=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/dlclark/regexp2 v1.11.0 h1:G/nrcoOa7ZXlpoa/91N3X7mM3r8eIlMBBJZvsz/mxKI=
 github.com/dlclark/regexp2 v1.11.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=

internal/config/config.go

@@ -33,7 +33,13 @@ type Config struct {
 	PermissionMode string `json:"permissionMode,omitempty"`
 
 	// Tool settings
-	AllowedTools []string `json:"allowedTools,omitempty"`
+	AllowedTools    []string `json:"allowedTools,omitempty"`
+	DisallowedTools []string `json:"disallowedTools,omitempty"`
+
+	// Advanced
+	FallbackModel          string `json:"fallbackModel,omitempty"`
+	Effort                 string `json:"effort,omitempty"` // "low", "medium", "high", "max"
+	EnableFileCheckpointing bool  `json:"enableFileCheckpointing,omitempty"`
 
 	// MCP servers
 	MCPServers map[string]types.MCPServerConfig `json:"mcpServers,omitempty"`

internal/slash/commands.go

@@ -1301,6 +1301,29 @@ func (h *Handler) worktreeCmd(args []string) Result {
 	}
 }
 
+// ─── /effort ──────────────────────────────────────
+
+func (h *Handler) effortCmd(args []string) Result {
+	if len(args) == 0 {
+		cfg := h.app.GetConfig()
+		current := cfg.Effort
+		if current == "" {
+			current = "(default)"
+		}
+		return Result{Message: fmt.Sprintf("Current effort: %s\n\nAvailable levels:\n  /effort low      Fast, concise responses\n  /effort medium   Balanced (default)\n  /effort high     Thorough analysis\n  /effort max      Maximum reasoning depth", current)}
+	}
+
+	level := strings.ToLower(args[0])
+	switch level {
+	case "low", "medium", "high", "max":
+		cfg := h.app.GetConfig()
+		cfg.Effort = level
+		return Result{Message: fmt.Sprintf("Effort level set to: %s\n(Takes effect on next query)", level)}
+	default:
+		return Result{Message: fmt.Sprintf("Unknown effort level: %s\nUse: low, medium, high, max", level)}
+	}
+}
+
 // ─── /btw ─────────────────────────────────────────
 
 func (h *Handler) btwCmd(args []string) Result {

internal/slash/slash.go

@@ -113,6 +113,8 @@ func AllCommands() []CommandDef {
 		{Name: "/worktree", Description: "Git worktree isolation (enter, exit)", HasArgs: true},
 		// Mid-query
 		{Name: "/btw", Description: "Side question (queued during execution)", HasArgs: true},
+		// Reasoning
+		{Name: "/effort", Description: "Set reasoning effort (low/medium/high/max)", HasArgs: true},
 	}
 }
 
@@ -262,6 +264,8 @@ func (h *Handler) Handle(input string) Result {
 		return h.worktreeCmd(args)
 	case "/btw":
 		return h.btwCmd(args)
+	case "/effort":
+		return h.effortCmd(args)
 	default:
 		// Try skill invocation
 		if result, ok := h.HandleSkillInvocation(cmd, args); ok {

internal/tui/model.go

@@ -215,20 +215,24 @@ func (m *Model) initAgent() tea.Cmd {
 		}
 
 		opts := agent.Options{
-			Model:              m.cfg.Model,
-			APIKey:             m.cfg.APIKey,
-			BaseURL:            m.cfg.BaseURL,
-			Provider:           m.cfg.Provider,
-			CWD:                cwd,
-			MaxTurns:           m.cfg.MaxTurns,
-			MaxBudgetUSD:       m.cfg.MaxBudgetUSD,
-			MCPServers:         m.cfg.MCPServers,
-			SystemPrompt:       m.cfg.SystemPrompt,
-			AppendSystemPrompt: appendPrompt,
-			CustomHeaders:      m.cfg.CustomHeaders,
-			ProxyURL:           m.cfg.ProxyURL,
-			AllowedTools:       m.cfg.AllowedTools,
-			Hooks:              buildHooksConfig(m.cfg),
+			Model:                  m.cfg.Model,
+			APIKey:                 m.cfg.APIKey,
+			BaseURL:                m.cfg.BaseURL,
+			Provider:               m.cfg.Provider,
+			CWD:                    cwd,
+			MaxTurns:               m.cfg.MaxTurns,
+			MaxBudgetUSD:           m.cfg.MaxBudgetUSD,
+			MCPServers:             m.cfg.MCPServers,
+			SystemPrompt:           m.cfg.SystemPrompt,
+			AppendSystemPrompt:     appendPrompt,
+			CustomHeaders:          m.cfg.CustomHeaders,
+			ProxyURL:               m.cfg.ProxyURL,
+			AllowedTools:           m.cfg.AllowedTools,
+			DisallowedTools:        m.cfg.DisallowedTools,
+			FallbackModel:          m.cfg.FallbackModel,
+			Effort:                 agent.Effort(m.cfg.Effort),
+			EnableFileCheckpointing: m.cfg.EnableFileCheckpointing,
+			Hooks:                  buildHooksConfig(m.cfg),
 		}
 
 		// Always use our interactive callback — it checks mode internally