diff --git a/internal/agent/agents.go b/internal/agent/agents.go
index 610e7011..44a4f6a8 100644
--- a/internal/agent/agents.go
+++ b/internal/agent/agents.go
@@ -419,6 +419,20 @@ func goose(home, cfg string) *Agent {
 			Options: func(cur map[string]string) []Option {
 				return ownOptions("", cur["model"], "anthropic", "openai", "google", "openrouter")
 			},
+		}, {
+			// GOOSE_THINKING_EFFORT, the effort goose asks of a model that
+			// thinks, for every provider
+			Key: "effort", Label: "effort",
+			Get: func() string { v, _ := get("GOOSE_THINKING_EFFORT"); return v },
+			Set: func(v string) error {
+				if v == "" {
+					return edit.DelYAMLTop(path, "GOOSE_THINKING_EFFORT")
+				}
+				return set(edit.KV{Path: "GOOSE_THINKING_EFFORT", Value: v})
+			},
+			Options: func(map[string]string) []Option {
+				return static("off", "low", "medium", "high", "max")
+			},
 		}},
 	}
 }
@@ -470,6 +484,21 @@ func copilot(home string) *Agent {
 				}
 				return out
 			},
+		}, {
+			// effortLevel, which Copilot saves beside the model and clears
+			// when its own /model changes the model; the levels are the
+			// model's, low to xhigh when Copilot's list does not say
+			Key: "effort", Label: "effort",
+			Get: jsonGet(path, "effortLevel"),
+			Set: jsonSet(path, "effortLevel"),
+			Options: func(cur map[string]string) []Option {
+				if live, _, ok := catalog.Live("copilot"); ok {
+					if e := catalog.Efforts(live, cur["model"]); len(e) > 0 {
+						return static(e...)
+					}
+				}
+				return static("low", "medium", "high", "xhigh")
+			},
 		}},
 	}
 }
@@ -541,6 +570,22 @@ func crush(home, cfg string) *Agent {
 		Fields: []Field{
 			{Key: "model", Label: "large", Get: pairGet(get, "models.large.provider", "models.large.model"), Set: setter("models.large.provider", "models.large.model"), Options: opts("model")},
 			{Key: "small", Label: "small", Get: pairGet(get, "models.small.provider", "models.small.model"), Set: setter("models.small.provider", "models.small.model"), Options: opts("small")},
+			{
+				// the large model's reasoning_effort, which Crush's schema
+				// takes as low, medium or high (for OpenAI-style models)
+				Key: "effort", Label: "effort",
+				Get: func() string { v, _ := get("models.large.reasoning_effort"); return v },
+				Set: func(v string) error {
+					if v == "" {
+						return edit.DelJSON(path, "models.large.reasoning_effort")
+					}
+					if m, _ := get("models.large.model"); m == "" {
+						return fmt.Errorf("pick Crush's large model first; the effort is kept with it")
+					}
+					return set(edit.KV{Path: "models.large.reasoning_effort", Value: v})
+				},
+				Options: func(map[string]string) []Option { return static("low", "medium", "high") },
+			},
 		},
 	}
 }
diff --git a/internal/agent/claude.go b/internal/agent/claude.go
index 52609eb4..8bdd4677 100644
--- a/internal/agent/claude.go
+++ b/internal/agent/claude.go
@@ -30,6 +30,9 @@ var claudeEnv = []string{
 // A tier that has none follows the main model.
 var claudeTiers = []string{"opus", "sonnet", "haiku", "fable"}
 
+// claudeEfforts are the levels settings.json's effortLevel takes.
+var claudeEfforts = []string{"low", "medium", "high", "xhigh"}
+
 func tierEnv(tier string) string { return "ANTHROPIC_DEFAULT_" + strings.ToUpper(tier) + "_MODEL" }
 
 func claude(home string) *Agent {
@@ -148,6 +151,20 @@ func claude(home string) *Agent {
 			// go stale.
 			return append(group(name, own), claudeViaMagpie()...)
 		},
+	}, {
+		// the effort Claude Code starts with, as its /effort saves it;
+		// settings.json keeps low to xhigh (max lasts a session only)
+		Key: "effort", Label: "effort",
+		Get: jsonGet(path, "effortLevel"),
+		Set: func(v string) error {
+			if v != "" && !contains(claudeEfforts, v) {
+				return fmt.Errorf("Claude Code keeps an effort of %s, not %q", strings.Join(claudeEfforts, ", "), v)
+			}
+			return jsonSet(path, "effortLevel")(v)
+		},
+		Options: func(map[string]string) []Option {
+			return static(claudeEfforts...)
+		},
 	}}
 	for _, tier := range claudeTiers {
 		fields = append(fields, Field{
diff --git a/internal/agent/commandcode.go b/internal/agent/commandcode.go
index 37ba071d..75b221c4 100644
--- a/internal/agent/commandcode.go
+++ b/internal/agent/commandcode.go
@@ -8,6 +8,8 @@ package agent
 // at the first "/". Command Code still wants its own sign-in for these.
 
 import (
+	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 	"slices"
@@ -91,6 +93,47 @@ func commandCode(home string) *Agent {
 				}
 				return append(out, viaMagpie("commandcode", magpieID+"/")...)
 			},
+		}, {
+			// settings.json's reasoningEffort keeps an effort for each model
+			// (Command Code's /effort saves it); this is the current model's
+			Key: "effort", Label: "effort",
+			Get: func() string { return ccEffortMap(path)[get("model")] },
+			Set: func(v string) error {
+				model := get("model")
+				if model == "" {
+					return fmt.Errorf("pick Command Code's model first; it keeps an effort for each model")
+				}
+				efforts := ccEffortMap(path)
+				if v == "" {
+					delete(efforts, model)
+				} else {
+					efforts[model] = v
+				}
+				if len(efforts) == 0 {
+					return edit.DelJSON(path, "reasoningEffort")
+				}
+				// written whole, as model ids hold dots
+				return edit.SetJSON(path, edit.KV{Path: "reasoningEffort", Value: efforts})
+			},
+			Options: func(cur map[string]string) []Option {
+				if ref, ok := strings.CutPrefix(cur["model"], magpieID+"/"); ok {
+					for _, m := range magpieModels("commandcode") {
+						if m.ID != ref {
+							continue
+						}
+						var efforts []string
+						for _, x := range ccEfforts {
+							if slices.Contains(m.Efforts, x) {
+								efforts = append(efforts, x)
+							}
+						}
+						if len(efforts) > 0 {
+							return static(efforts...)
+						}
+					}
+				}
+				return static(ccEfforts...)
+			},
 		}},
 	}
 }
@@ -115,3 +158,24 @@ func ccProviderJSON() any {
 	}
 	return map[string]any{"name": "magpie", "api": "openai-completions", "baseURL": gatewayV1(), "apiKey": false, "models": ms}
 }
+
+// ccEffortMap is settings.json's reasoningEffort, model id to effort.
+func ccEffortMap(path string) map[string]string {
+	out := map[string]string{}
+	b, err := os.ReadFile(path)
+	if err != nil {
+		return out
+	}
+	var c struct {
+		Efforts map[string]any `json:"reasoningEffort"`
+	}
+	if json.Unmarshal(b, &c) != nil {
+		return out
+	}
+	for k, v := range c.Efforts {
+		if s, ok := v.(string); ok {
+			out[k] = s
+		}
+	}
+	return out
+}
diff --git a/internal/agent/dsh.go b/internal/agent/dsh.go
index 791cba6c..6e97c1c4 100644
--- a/internal/agent/dsh.go
+++ b/internal/agent/dsh.go
@@ -74,6 +74,13 @@ func dsh(home string) *Agent {
 			Options: func(map[string]string) []Option {
 				return append(append([]Option{}, dshModels...), viaMagpie("dsh", magpieID+"/")...)
 			},
+		}, {
+			// llm-deepseek's reasoningEffort, the thinking effort sessions
+			// start with (off, high or max; dsh's own default is high)
+			Key: "effort", Label: "thinking",
+			Get:     func() string { return dshGetEffort(dir) },
+			Set:     func(v string) error { return dshSetEffort(dir, v) },
+			Options: func(map[string]string) []Option { return static(dshEfforts...) },
 		}},
 	}
 }
@@ -320,13 +327,13 @@ func dshSetFile(path, v string, modern bool) error {
 		drop("agent-loop")
 		drop("llm-deepseek")
 	case modern && viaGateway:
-		put("llm-deepseek", dshProviderLines(true))
+		put("llm-deepseek", dshProviderLines(true, dshEffortIn(items)))
 		put("agent-default-model", dshDefaultLines(ref))
 	case modern:
 		drop("llm-deepseek")
 		put("agent-default-model", dshDefaultLines(v))
 	case viaGateway:
-		put("llm-deepseek", dshProviderLines(false))
+		put("llm-deepseek", dshProviderLines(false, dshEffortIn(items)))
 		put("agent-loop", dshLoopLines(ref))
 		put("api-gateway", dshRouteLines(ref))
 	default:
@@ -356,19 +363,23 @@ func yamlQuote(s string) string {
 
 // dshProviderLines is the llm-deepseek entry pointing dsh at the gateway,
 // with the catalog as the models its /model offers. Since 0.1.5 the key is a
-// credential the entry names rather than holds.
-func dshProviderLines(modern bool) []string {
+// credential the entry names rather than holds. effort is the thinking
+// effort sessions start with, high (dsh's own default) when "".
+func dshProviderLines(modern bool, effort string) []string {
 	key := "    apiKey: " + yamlQuote(gateway.Token)
 	if modern {
 		key = "    apiKeyEnv: " + dshKeyRef
 	}
+	if effort == "" {
+		effort = "high"
+	}
 	lines := []string{
 		"- id: llm-deepseek " + dshMark,
 		"  config:",
 		key,
 		"    baseURL: " + yamlQuote(gatewayV1()),
 		"    thinking: enabled",
-		"    reasoningEffort: high",
+		"    reasoningEffort: " + effort,
 		"    models:",
 	}
 	ms := magpieModels("dsh")
@@ -447,7 +458,7 @@ func dshSync(dir string) error {
 		for _, l := range items[i].lines {
 			modern = modern || strings.HasPrefix(strings.TrimSpace(l), "apiKeyEnv:")
 		}
-		lines := dshProviderLines(modern)
+		lines := dshProviderLines(modern, dshEffortIn(items))
 		if strings.Join(lines, "\n") == strings.Join(items[i].lines, "\n") {
 			continue
 		}
@@ -463,6 +474,79 @@ func dshSync(dir string) error {
 	return nil
 }
 
+// dshEfforts are the thinking efforts llm-deepseek takes.
+var dshEfforts = []string{"off", "high", "max"}
+
+// dshEffortIn is the reasoningEffort of the llm-deepseek entry magpie
+// wrote, "" when there is none.
+func dshEffortIn(items []dshItem) string {
+	i := dshFind(items, "llm-deepseek")
+	if i < 0 || !items[i].magpie {
+		return ""
+	}
+	for _, l := range items[i].lines {
+		if k, v, ok := strings.Cut(strings.TrimSpace(l), ":"); ok && k == "reasoningEffort" {
+			return yamlScalar(strings.TrimSpace(v))
+		}
+	}
+	return ""
+}
+
+// dshFiles are the patch lists magpie writes: every profile's, else
+// config.yaml.
+func dshFiles(dir string) []string {
+	if files := dshProfiles(dir); len(files) > 0 {
+		return files
+	}
+	return []string{filepath.Join(dir, "config.yaml")}
+}
+
+// dshGetEffort reads the effort of magpie's llm-deepseek entry.
+func dshGetEffort(dir string) string {
+	_, items, err := dshRead(dshFiles(dir)[0])
+	if err != nil {
+		return ""
+	}
+	return dshEffortIn(items)
+}
+
+// dshSetEffort writes v into each llm-deepseek entry magpie wrote. dsh's
+// own row is used whole when there is none, so the effort goes with a
+// model through magpie.
+func dshSetEffort(dir, v string) error {
+	if v != "" && !contains(dshEfforts, v) {
+		return fmt.Errorf("DeepSeek Harness takes an effort of %s, not %q", strings.Join(dshEfforts, ", "), v)
+	}
+	done := false
+	for _, f := range dshFiles(dir) {
+		head, items, err := dshRead(f)
+		if err != nil {
+			continue
+		}
+		i := dshFind(items, "llm-deepseek")
+		if i < 0 || !items[i].magpie {
+			continue
+		}
+		modern := false
+		for _, l := range items[i].lines {
+			modern = modern || strings.HasPrefix(strings.TrimSpace(l), "apiKeyEnv:")
+		}
+		items[i].lines = dshProviderLines(modern, v)
+		out := append([]string{}, head...)
+		for _, it := range items {
+			out = append(out, it.lines...)
+		}
+		if err := edit.WriteAtomic(f, []byte(strings.Join(out, "\n")+"\n")); err != nil {
+			return err
+		}
+		done = true
+	}
+	if !done && v != "" {
+		return fmt.Errorf("pick a model through magpie for DeepSeek Harness first; the effort is kept with magpie's DeepSeek entry")
+	}
+	return nil
+}
+
 // dshSettingsEndpoint reports whether dsh's own settings carry an
 // llm-deepseek section with an endpoint or key, which dsh puts over the
 // patch list.
diff --git a/internal/agent/dsh_test.go b/internal/agent/dsh_test.go
index b771c0e6..a35665ec 100644
--- a/internal/agent/dsh_test.go
+++ b/internal/agent/dsh_test.go
@@ -185,7 +185,7 @@ func TestDshModelLimits(t *testing.T) {
 	}); err != nil {
 		t.Fatal(err)
 	}
-	s := strings.Join(dshProviderLines(true), "\n")
+	s := strings.Join(dshProviderLines(true, ""), "\n")
 	want := `      - id: "v/see"
         name: "see · V"
         contextWindow: 400000
diff --git a/internal/agent/effort_test.go b/internal/agent/effort_test.go
new file mode 100644
index 00000000..8e3b6718
--- /dev/null
+++ b/internal/agent/effort_test.go
@@ -0,0 +1,187 @@
+package agent
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/yetone/magpie/internal/edit"
+	"github.com/yetone/magpie/internal/provider"
+)
+
+// effortHome is a sandbox HOME with a provider for magpie to serve.
+func effortHome(t *testing.T) string {
+	t.Helper()
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, ".config"))
+	t.Setenv("XDG_CACHE_HOME", filepath.Join(home, ".cache"))
+	t.Setenv("HERMES_HOME", "")
+	t.Setenv("DSH_HOME", "")
+	if err := provider.Save(provider.Provider{ID: "deepseek", Name: "DeepSeek", Chat: "https://api.deepseek.com/v1", Key: "k", Models: []string{"pro", "flash"}}); err != nil {
+		t.Fatal(err)
+	}
+	return home
+}
+
+// setEffort sets, reads back and resets an agent's effort, checking what
+// else is in its file stays.
+func setEffort(t *testing.T, a *Agent, v, keep string) {
+	t.Helper()
+	f := a.Field("effort")
+	if f == nil {
+		t.Fatalf("%s has no effort field", a.ID)
+	}
+	if err := f.Set(v); err != nil {
+		t.Fatalf("%s: %v", a.ID, err)
+	}
+	if got := f.Get(); got != v {
+		t.Fatalf("%s: effort %q, want %q\n%s", a.ID, got, v, readFile(a.Path))
+	}
+	found := false
+	for _, o := range f.Options(map[string]string{}) {
+		found = found || o.Value == v
+	}
+	if !found {
+		t.Fatalf("%s: %q not among the options", a.ID, v)
+	}
+	if !strings.Contains(readFile(a.Path), keep) {
+		t.Fatalf("%s lost %q:\n%s", a.ID, keep, readFile(a.Path))
+	}
+	if err := f.Set(""); err != nil {
+		t.Fatal(err)
+	}
+	if got := f.Get(); got != "" {
+		t.Fatalf("%s: reset left %q\n%s", a.ID, got, readFile(a.Path))
+	}
+	if !strings.Contains(readFile(a.Path), keep) {
+		t.Fatalf("%s lost %q on reset:\n%s", a.ID, keep, readFile(a.Path))
+	}
+}
+
+func TestEffortFields(t *testing.T) {
+	home := effortHome(t)
+	cfg := filepath.Join(home, ".config")
+
+	writeFile(t, filepath.Join(home, ".claude", "settings.json"), `{"theme":"dark","model":"opus"}`)
+	c := claude(home)
+	setEffort(t, c, "xhigh", `"theme"`)
+	// max lasts a session in Claude Code; settings.json drops it
+	if err := c.Field("effort").Set("max"); err == nil {
+		t.Fatal("claude took max")
+	}
+
+	writeFile(t, filepath.Join(home, ".hermes", "config.yaml"), "model:\n  default: x\nagent:\n  max_turns: 9\n")
+	h := hermes(home)
+	setEffort(t, h, "none", "max_turns: 9")
+	if v, _ := edit.GetYAML(h.Path, "model.default"); v != "x" {
+		t.Fatalf("hermes model: %q", v)
+	}
+
+	writeFile(t, filepath.Join(home, ".omp", "agent", "config.yml"), "modelRoles:\n  default: a/b\n")
+	setEffort(t, omp(home), "xhigh", "default: a/b")
+
+	writeFile(t, filepath.Join(cfg, "goose", "config.yaml"), "GOOSE_MODEL: m\nGOOSE_PROVIDER: p\n")
+	g := goose(home, cfg)
+	setEffort(t, g, "max", "GOOSE_MODEL: m")
+	if v, _ := edit.GetYAMLTop(g.Path, "GOOSE_PROVIDER"); v != "p" {
+		t.Fatalf("goose provider: %q", v)
+	}
+
+	writeFile(t, filepath.Join(home, ".copilot", "settings.json"), `{"model":"gpt-5.5","contextTier":"long"}`)
+	setEffort(t, copilot(home), "xhigh", `"contextTier"`)
+
+	cr := crush(home, cfg)
+	os.MkdirAll(filepath.Dir(cr.Path), 0o755)
+	os.WriteFile(cr.Path, []byte(`{"options":{"debug":true}}`), 0o644)
+	// Crush keeps the effort with the large model
+	if err := cr.Field("effort").Set("high"); err == nil {
+		t.Fatal("crush took an effort without a large model")
+	}
+	if err := cr.Field("model").Set("magpie/deepseek/pro"); err != nil {
+		t.Fatal(err)
+	}
+	setEffort(t, cr, "medium", `"debug"`)
+	if cr.Field("model").Get() != "magpie/deepseek/pro" {
+		t.Fatalf("crush model: %s", readFile(cr.Path))
+	}
+}
+
+func TestCommandCodeEffort(t *testing.T) {
+	home := effortHome(t)
+	path := filepath.Join(home, ".commandcode", "settings.json")
+	writeFile(t, path, `{"theme":"dark","reasoningEffort":{"gpt-5.5":"low"}}`)
+	a := commandCode(home)
+	f := a.Field("effort")
+	if err := f.Set("high"); err == nil {
+		t.Fatal("took an effort without a model")
+	}
+	if err := a.Field("model").Set("magpie/deepseek/pro"); err != nil {
+		t.Fatal(err)
+	}
+	setEffort(t, a, "max", `"theme"`)
+	// each model keeps its own; the other one's stays
+	if m := ccEffortMap(path); m["gpt-5.5"] != "low" || len(m) != 1 {
+		t.Fatalf("efforts: %v\n%s", m, readFile(path))
+	}
+	// a model id with dots is one key, not a path
+	if err := a.Field("model").Set("anthropic/claude-4.5"); err != nil {
+		t.Fatal(err)
+	}
+	if err := f.Set("xhigh"); err != nil {
+		t.Fatal(err)
+	}
+	if m := ccEffortMap(path); m["anthropic/claude-4.5"] != "xhigh" || m["gpt-5.5"] != "low" {
+		t.Fatalf("efforts: %v\n%s", m, readFile(path))
+	}
+	// the last one gone, the map goes too
+	os.WriteFile(path, []byte(`{"model":"x","reasoningEffort":{"x":"low"}}`), 0o644)
+	if err := f.Set(""); err != nil {
+		t.Fatal(err)
+	}
+	if strings.Contains(readFile(path), "reasoningEffort") {
+		t.Fatalf("left the map:\n%s", readFile(path))
+	}
+}
+
+func TestDshEffort(t *testing.T) {
+	home := effortHome(t)
+	patch := filepath.Join(home, ".dsh", "profiles", "web", "cordis.patch.yml")
+	writeFile(t, patch, "[]\n")
+	a := dsh(home)
+	f := a.Field("effort")
+	// dsh's own row is used whole; the effort goes with magpie's
+	if err := f.Set("max"); err == nil {
+		t.Fatal("took an effort on dsh's own row")
+	}
+	if err := a.Field("model").Set("magpie/deepseek/pro"); err != nil {
+		t.Fatal(err)
+	}
+	if f.Get() != "high" {
+		t.Fatalf("effort: %q\n%s", f.Get(), readFile(patch))
+	}
+	if err := f.Set("max"); err != nil {
+		t.Fatal(err)
+	}
+	if err := f.Set("low"); err == nil {
+		t.Fatal("took low")
+	}
+	// kept when the model changes and when the catalog is synced
+	if err := a.Field("model").Set("magpie/deepseek/flash"); err != nil {
+		t.Fatal(err)
+	}
+	if err := a.Sync(); err != nil {
+		t.Fatal(err)
+	}
+	raw := readFile(patch)
+	if f.Get() != "max" || strings.Count(raw, "reasoningEffort:") != 1 || !strings.Contains(raw, `model: "deepseek/flash"`) {
+		t.Fatalf("patch:\n%s", raw)
+	}
+	if err := f.Set(""); err != nil {
+		t.Fatal(err)
+	}
+	if f.Get() != "high" {
+		t.Fatalf("reset: %q", f.Get())
+	}
+}
diff --git a/internal/agent/hermes.go b/internal/agent/hermes.go
index 38cada33..2c208f3c 100644
--- a/internal/agent/hermes.go
+++ b/internal/agent/hermes.go
@@ -108,6 +108,20 @@ func hermes(home string) *Agent {
 			Options: func(cur map[string]string) []Option {
 				return append(ownOptions("", cur["model"]), viaMagpie("hermes", magpieID+"/")...)
 			},
+		}, {
+			// agent.reasoning_effort, which Hermes's /reasoning saves; none
+			// turns reasoning off, and unset Hermes asks for medium
+			Key: "effort", Label: "effort",
+			Get: func() string { return getKey("agent.reasoning_effort") },
+			Set: func(v string) error {
+				if v == "" {
+					return edit.DelYAML(path, "agent.reasoning_effort")
+				}
+				return edit.SetYAML(path, edit.KV{Path: "agent.reasoning_effort", Value: v})
+			},
+			Options: func(map[string]string) []Option {
+				return static("none", "minimal", "low", "medium", "high", "xhigh")
+			},
 		}},
 	}
 }
diff --git a/internal/agent/omp.go b/internal/agent/omp.go
index 29b9dce1..6a17b17d 100644
--- a/internal/agent/omp.go
+++ b/internal/agent/omp.go
@@ -98,6 +98,18 @@ func omp(home string) *Agent {
 			Options: func(cur map[string]string) []Option {
 				return append(ownOptions("", cur["model"]), viaMagpie("omp", magpieID+"/")...)
 			},
+		}, {
+			// the thinking level sessions start with, as omp's settings save
+			// it; unset omp takes high (it also knows auto, its own pick)
+			Key: "effort", Label: "thinking",
+			Get: func() string { v, _ := edit.GetYAML(path, "defaultThinkingLevel"); return v },
+			Set: func(v string) error {
+				if v == "" {
+					return edit.DelYAML(path, "defaultThinkingLevel")
+				}
+				return edit.SetYAML(path, edit.KV{Path: "defaultThinkingLevel", Value: v})
+			},
+			Options: func(map[string]string) []Option { return static(ompEfforts...) },
 		}},
 	}
 }