Make request execution overrides presence-aware

internal/adapter/cli/run.go

@@ -513,18 +513,25 @@ func buildRunRequestFromConfig(cfg *runConfig) (domain.RunRequest, error) {
 		inputs[name] = domain.ArtifactRef{Type: domain.ArtifactRefFile, URI: path}
 	}
 
-	var modelOverride *domain.ExecutionTarget
+	var modelOverride *domain.ExecutionTargetOverride
 	if cfg.llmBaseURLSet || cfg.modelSet || cfg.temperatureSet || cfg.maxTokensSet || cfg.topPSet || cfg.apiKeyEnvSet || cfg.timeoutSet {
-		modelOverride = &domain.ExecutionTarget{
+		modelOverride = &domain.ExecutionTargetOverride{
-			Endpoint:    cfg.llmBaseURL,
+			Endpoint:  cfg.llmBaseURL,
-			Model:       cfg.model,
+			Model:     cfg.model,
-			Temperature: cfg.temperature,
+			APIKeyEnv: cfg.apiKeyEnv,
-			MaxTokens:   cfg.maxTokens,
+		}
-			TopP:        cfg.topP,
+		if cfg.temperatureSet {
-			APIKeyEnv:   cfg.apiKeyEnv,
+			modelOverride.Temperature = &cfg.temperature
+		}
+		if cfg.maxTokensSet {
+			modelOverride.MaxTokens = &cfg.maxTokens
+		}
+		if cfg.topPSet {
+			modelOverride.TopP = &cfg.topP
 		}
 		if cfg.timeoutSet {
-			modelOverride.TimeoutSeconds = int(cfg.timeout.Seconds())
+			timeoutSeconds := int(cfg.timeout.Seconds())
+			modelOverride.TimeoutSeconds = &timeoutSeconds
 		}
 	}
 

internal/adapter/cli/run_test.go

@@ -747,6 +747,35 @@ func TestRenderCommandDefaultFormatTextIncludesPreparedDetailsAndNoSecrets(t *te
 	}
 }
 
+func TestRenderCommandExplicitZeroTemperatureReachesEffectiveSettings(t *testing.T) {
+	lib := newCLITestLibrary(t)
+	inputPath := lib.writeInputFile(t, "transcript.md", "hello transcript")
+
+	writePromptFile(t, lib.promptDir, "prompt.render", "local-default")
+	profile := `id: local-default
+endpoint: http://127.0.0.1:1/v1
+model: profile-model
+temperature: 0.7
+`
+	if err := os.WriteFile(filepath.Join(lib.profileDir, "local-default.yaml"), []byte(profile), 0o644); err != nil {
+		t.Fatalf("failed to write profile fixture: %v", err)
+	}
+
+	code, stdout, stderr := runCLICommand(t, renderCommand, []string{
+		"--prompt-dir", lib.promptDir,
+		"--profile-dir", lib.profileDir,
+		"--prompt", "prompt.render",
+		"--input", "transcript=" + inputPath,
+		"--temperature", "0",
+	})
+	if code != ExitOK {
+		t.Fatalf("expected ExitOK, got %d stderr=%q", code, stderr)
+	}
+	if !strings.Contains(stdout, "\n  temperature: 0\n") {
+		t.Fatalf("expected explicit zero temperature in effective settings, got:\n%s", stdout)
+	}
+}
+
 func TestRenderCommandSucceedsWithPromptAndProfileDirsFromConfig(t *testing.T) {
 	lib := newCLITestLibrary(t)
 	inputPath := lib.writeInputFile(t, "transcript.md", "hello transcript")

internal/adapter/http/dto.go

@@ -23,10 +23,10 @@ type inputRefDTO struct {
 type modelOverrideRequestDTO struct {
 	Endpoint        string            `json:"endpoint,omitempty"`
 	Model           string            `json:"model,omitempty"`
-	Temperature     float64           `json:"temperature,omitempty"`
+	Temperature     *float64          `json:"temperature,omitempty"`
-	MaxTokens       int               `json:"max_tokens,omitempty"`
+	MaxTokens       *int              `json:"max_tokens,omitempty"`
-	TopP            float64           `json:"top_p,omitempty"`
+	TopP            *float64          `json:"top_p,omitempty"`
-	TimeoutSeconds  int               `json:"timeout_seconds,omitempty"`
+	TimeoutSeconds  *int              `json:"timeout_seconds,omitempty"`
 	ServiceTier     string            `json:"service_tier,omitempty"`
 	ReasoningEffort string            `json:"reasoning_effort,omitempty"`
 	APIKeyEnv       string            `json:"api_key_env,omitempty"`
@@ -70,16 +70,16 @@ type metadataDTO struct {
 }
 
 type modelParamsDTO struct {
-	Endpoint        string            `json:"endpoint"`
+	Endpoint        string         `json:"endpoint"`
-	Model           string            `json:"model"`
+	Model           string         `json:"model"`
-	Temperature     float64           `json:"temperature"`
+	Temperature     float64        `json:"temperature"`
-	MaxTokens       int               `json:"max_tokens"`
+	MaxTokens       int            `json:"max_tokens"`
-	TopP            float64           `json:"top_p"`
+	TopP            float64        `json:"top_p"`
-	TimeoutSeconds  int               `json:"timeout_seconds"`
+	TimeoutSeconds  int            `json:"timeout_seconds"`
-	ServiceTier     string            `json:"service_tier,omitempty"`
+	ServiceTier     string         `json:"service_tier,omitempty"`
-	ReasoningEffort string            `json:"reasoning_effort,omitempty"`
+	ReasoningEffort string         `json:"reasoning_effort,omitempty"`
-	APIKeyEnv       string            `json:"api_key_env,omitempty"`
+	APIKeyEnv       string         `json:"api_key_env,omitempty"`
-	ExtraParams     map[string]string `json:"extra_params,omitempty"`
+	ExtraParams     map[string]any `json:"extra_params,omitempty"`
 }
 
 type tokenUsageDTO struct {

internal/adapter/http/handler.go

@@ -61,9 +61,9 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	var model *domain.ExecutionTarget
+	var model *domain.ExecutionTargetOverride
 	if req.Model != nil {
-		model = executionTargetFromModelOverrideDTO(req.Model)
+		model = executionTargetOverrideFromModelOverrideDTO(req.Model)
 	}
 
 	res, err := h.runner.Run(r.Context(), domain.RunRequest{
@@ -123,11 +123,11 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, resp)
 }
 
-func executionTargetFromModelOverrideDTO(dto *modelOverrideRequestDTO) *domain.ExecutionTarget {
+func executionTargetOverrideFromModelOverrideDTO(dto *modelOverrideRequestDTO) *domain.ExecutionTargetOverride {
 	if dto == nil {
 		return nil
 	}
-	return &domain.ExecutionTarget{
+	return &domain.ExecutionTargetOverride{
 		Endpoint:        dto.Endpoint,
 		Model:           dto.Model,
 		Temperature:     dto.Temperature,
@@ -137,7 +137,7 @@ func executionTargetFromModelOverrideDTO(dto *modelOverrideRequestDTO) *domain.E
 		ServiceTier:     dto.ServiceTier,
 		ReasoningEffort: dto.ReasoningEffort,
 		APIKeyEnv:       dto.APIKeyEnv,
-		ExtraParams:     dto.ExtraParams,
+		ExtraParams:     stringMapToAnyMap(dto.ExtraParams),
 	}
 }
 
@@ -156,6 +156,17 @@ func modelParamsDTOFromExecutionTarget(target domain.ExecutionTarget) modelParam
 	}
 }
 
+func stringMapToAnyMap(src map[string]string) map[string]any {
+	if len(src) == 0 {
+		return nil
+	}
+	out := make(map[string]any, len(src))
+	for k, v := range src {
+		out[k] = v
+	}
+	return out
+}
+
 func mapValidation(v domain.ValidationResult) validationDTO {
 	return validationDTO{
 		Status:         string(v.Status),

internal/adapter/http/handler_test.go

@@ -147,7 +147,7 @@ func TestHandlerPostRunsSuccessWithExplicitProfileID(t *testing.T) {
 	if r.last.Execution == nil || r.last.Execution.Model != "gpt-x" {
 		t.Fatalf("expected model override, got %#v", r.last.Execution)
 	}
-	if r.last.Execution.TimeoutSeconds != 120 {
+	if r.last.Execution.TimeoutSeconds == nil || *r.last.Execution.TimeoutSeconds != 120 {
 		t.Fatalf("expected timeout_seconds override 120, got %#v", r.last.Execution)
 	}
 	if r.last.Execution.ServiceTier != "flex" {
@@ -228,20 +228,92 @@ func TestHandlerModelOverrideMapsAllSupportedExecutionFields(t *testing.T) {
 	got := r.last.Execution
 	if got.Endpoint != "http://override/v1" ||
 		got.Model != "override-model" ||
-		got.Temperature != 0.6 ||
-		got.MaxTokens != 250 ||
-		got.TopP != 0.85 ||
-		got.TimeoutSeconds != 33 ||
 		got.ServiceTier != "flex" ||
 		got.ReasoningEffort != "medium" ||
 		got.APIKeyEnv != "SCRIPTORIUM_API_KEY" {
 		t.Fatalf("unexpected mapped execution target: %+v", got)
 	}
-	if !reflect.DeepEqual(got.ExtraParams, map[string]string{"provider_option": "on"}) {
+	if got.Temperature == nil || *got.Temperature != 0.6 {
+		t.Fatalf("unexpected mapped temperature: %#v", got.Temperature)
+	}
+	if got.MaxTokens == nil || *got.MaxTokens != 250 {
+		t.Fatalf("unexpected mapped max_tokens: %#v", got.MaxTokens)
+	}
+	if got.TopP == nil || *got.TopP != 0.85 {
+		t.Fatalf("unexpected mapped top_p: %#v", got.TopP)
+	}
+	if got.TimeoutSeconds == nil || *got.TimeoutSeconds != 33 {
+		t.Fatalf("unexpected mapped timeout_seconds: %#v", got.TimeoutSeconds)
+	}
+	if !reflect.DeepEqual(got.ExtraParams, map[string]any{"provider_option": "on"}) {
 		t.Fatalf("unexpected mapped extra_params: %#v", got.ExtraParams)
 	}
 }
 
+func TestHandlerModelOverrideExplicitZeroTemperatureMapsAsPresent(t *testing.T) {
+	r := &fakeRunner{result: &domain.RunResult{
+		Artifact:             domain.Artifact{Body: []byte("ok")},
+		Validation:           domain.ValidationResult{Status: domain.ValidationPassed, Mode: domain.ValidationBasic, IsValid: true},
+		EffectiveModelParams: domain.ExecutionTarget{Endpoint: "http://llm/v1", Model: "m1", Temperature: 0},
+	}}
+	h := NewHandler(r)
+
+	req := httptest.NewRequest(http.MethodPost, "/v1/runs", bytes.NewBufferString(`{
+		"prompt_id": "prompt-1",
+		"inputs": {"transcript": {"type": "file", "uri": "./t.md"}},
+		"model": {"temperature": 0}
+	}`))
+	w := httptest.NewRecorder()
+	h.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d body=%s", w.Code, w.Body.String())
+	}
+	if r.last.Execution == nil || r.last.Execution.Temperature == nil {
+		t.Fatalf("expected temperature override to be present, got %#v", r.last.Execution)
+	}
+	if *r.last.Execution.Temperature != 0 {
+		t.Fatalf("expected zero temperature override, got %v", *r.last.Execution.Temperature)
+	}
+}
+
+func TestHandlerModelOverrideOmittedTemperatureMapsAsAbsent(t *testing.T) {
+	r := &fakeRunner{result: &domain.RunResult{
+		Artifact:             domain.Artifact{Body: []byte("ok")},
+		Validation:           domain.ValidationResult{Status: domain.ValidationPassed, Mode: domain.ValidationBasic, IsValid: true},
+		EffectiveModelParams: domain.ExecutionTarget{Endpoint: "http://llm/v1", Model: "m1", Temperature: 0.7},
+	}}
+	h := NewHandler(r)
+
+	req := httptest.NewRequest(http.MethodPost, "/v1/runs", bytes.NewBufferString(`{
+		"prompt_id": "prompt-1",
+		"inputs": {"transcript": {"type": "file", "uri": "./t.md"}},
+		"model": {"model": "override-model"}
+	}`))
+	w := httptest.NewRecorder()
+	h.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d body=%s", w.Code, w.Body.String())
+	}
+	if r.last.Execution == nil {
+		t.Fatal("expected model override")
+	}
+	if r.last.Execution.Temperature != nil {
+		t.Fatalf("expected omitted temperature to remain absent, got %#v", r.last.Execution.Temperature)
+	}
+
+	var resp map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("invalid JSON response: %v", err)
+	}
+	metadata := resp["metadata"].(map[string]any)
+	params := metadata["model_params"].(map[string]any)
+	if params["temperature"] != 0.7 {
+		t.Fatalf("expected effective profile/default temperature in response, got %#v", params["temperature"])
+	}
+}
+
 func TestHandlerResponseMetadataModelParamsIncludesAllSupportedFields(t *testing.T) {
 	r := &fakeRunner{result: &domain.RunResult{
 		Artifact: domain.Artifact{
@@ -262,7 +334,7 @@ func TestHandlerResponseMetadataModelParamsIncludesAllSupportedFields(t *testing
 			ServiceTier:     "priority",
 			ReasoningEffort: "high",
 			APIKeyEnv:       "SCRIPTORIUM_API_KEY",
-			ExtraParams: map[string]string{
+			ExtraParams: map[string]any{
 				"provider_option": "on",
 			},
 		},

internal/domain/domain.go

@@ -65,7 +65,7 @@ type RunRequest struct {
 	ProfileID     string
 	Inputs        map[string]ArtifactRef
 	Vars          map[string]string
-	Execution     *ExecutionTarget
+	Execution     *ExecutionTargetOverride
 	Validation    *OutputContract
 	Metadata      map[string]string
 }
@@ -159,31 +159,45 @@ type PromptMessageTemplate struct {
 
 // ExecutionProfile describes how and where to execute a model.
 type ExecutionProfile struct {
-	ID              string            `yaml:"id"`
+	ID              string         `yaml:"id"`
-	Endpoint        string            `yaml:"endpoint"`
+	Endpoint        string         `yaml:"endpoint"`
-	Model           string            `yaml:"model"`
+	Model           string         `yaml:"model"`
-	Temperature     float64           `yaml:"temperature"`
+	Temperature     float64        `yaml:"temperature"`
-	MaxTokens       int               `yaml:"max_tokens"`
+	MaxTokens       int            `yaml:"max_tokens"`
-	TopP            float64           `yaml:"top_p"`
+	TopP            float64        `yaml:"top_p"`
-	TimeoutSeconds  int               `yaml:"timeout_seconds"`
+	TimeoutSeconds  int            `yaml:"timeout_seconds"`
-	ServiceTier     string            `yaml:"service_tier"`
+	ServiceTier     string         `yaml:"service_tier"`
-	ReasoningEffort string            `yaml:"reasoning_effort"`
+	ReasoningEffort string         `yaml:"reasoning_effort"`
-	APIKeyEnv       string            `yaml:"api_key_env"`
+	APIKeyEnv       string         `yaml:"api_key_env"`
-	ExtraParams     map[string]string `yaml:"extra_params"`
+	ExtraParams     map[string]any `yaml:"extra_params"`
+}
+
+// ExecutionTargetOverride represents per-request runtime setting overrides.
+type ExecutionTargetOverride struct {
+	Endpoint        string         `json:"endpoint,omitempty"`
+	Model           string         `json:"model,omitempty"`
+	Temperature     *float64       `json:"temperature,omitempty"`
+	MaxTokens       *int           `json:"max_tokens,omitempty"`
+	TopP            *float64       `json:"top_p,omitempty"`
+	TimeoutSeconds  *int           `json:"timeout_seconds,omitempty"`
+	ServiceTier     string         `json:"service_tier,omitempty"`
+	ReasoningEffort string         `json:"reasoning_effort,omitempty"`
+	APIKeyEnv       string         `json:"api_key_env,omitempty"`
+	ExtraParams     map[string]any `json:"extra_params,omitempty"`
 }
 
 // ExecutionTarget represents effective model runtime settings for a run.
 type ExecutionTarget struct {
-	Endpoint        string            `yaml:"endpoint" json:"endpoint"`
+	Endpoint        string         `yaml:"endpoint" json:"endpoint"`
-	Model           string            `yaml:"model" json:"model"`
+	Model           string         `yaml:"model" json:"model"`
-	Temperature     float64           `yaml:"temperature" json:"temperature"`
+	Temperature     float64        `yaml:"temperature" json:"temperature"`
-	MaxTokens       int               `yaml:"max_tokens" json:"max_tokens"`
+	MaxTokens       int            `yaml:"max_tokens" json:"max_tokens"`
-	TopP            float64           `yaml:"top_p" json:"top_p"`
+	TopP            float64        `yaml:"top_p" json:"top_p"`
-	TimeoutSeconds  int               `yaml:"timeout_seconds" json:"timeout_seconds"`
+	TimeoutSeconds  int            `yaml:"timeout_seconds" json:"timeout_seconds"`
-	ServiceTier     string            `yaml:"service_tier" json:"service_tier"`
+	ServiceTier     string         `yaml:"service_tier" json:"service_tier"`
-	ReasoningEffort string            `yaml:"reasoning_effort" json:"reasoning_effort"`
+	ReasoningEffort string         `yaml:"reasoning_effort" json:"reasoning_effort"`
-	APIKeyEnv       string            `yaml:"api_key_env" json:"api_key_env"`
+	APIKeyEnv       string         `yaml:"api_key_env" json:"api_key_env"`
-	ExtraParams     map[string]string `yaml:"extra_params" json:"extra_params"`
+	ExtraParams     map[string]any `yaml:"extra_params" json:"extra_params"`
 }
 
 // OutputContract defines the requirements for the output artifact.

internal/llm/openai_compatible_client_test.go

@@ -438,7 +438,7 @@ func TestOpenAICompatibleClientOmitsReasoningEffortAndExtraParams(t *testing.T)
 		Target: domain.ExecutionTarget{
 			Model:           "model",
 			ReasoningEffort: "high",
-			ExtraParams: map[string]string{
+			ExtraParams: map[string]any{
 				"provider_option": "on",
 			},
 		},

internal/usecase/runner.go

@@ -187,7 +187,10 @@ func (r *Runner) Prepare(ctx context.Context, req domain.RunRequest) (*domain.Pr
 		return nil, fmt.Errorf("%w: %w", ErrProfileLoad, err)
 	}
 
-	effectiveModel := resolveExecutionTarget(execProfile, req.Execution)
+	effectiveModel, err := resolveExecutionTarget(execProfile, req.Execution)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %w", ErrInvalidRequest, err)
+	}
 	if strings.TrimSpace(effectiveModel.Endpoint) == "" {
 		return nil, fmt.Errorf("%w: execution endpoint is required", ErrInvalidRequest)
 	}
@@ -355,22 +358,69 @@ func mergeExecutionTarget(base domain.ExecutionTarget, override domain.Execution
 		out.APIKeyEnv = override.APIKeyEnv
 	}
 	if len(override.ExtraParams) > 0 {
-		cp := make(map[string]string, len(override.ExtraParams))
+		out.ExtraParams = copyExtraParams(override.ExtraParams)
-		for k, v := range override.ExtraParams {
-			cp[k] = v
-		}
-		out.ExtraParams = cp
 	}
 	return out
 }
 
-func resolveExecutionTarget(profileValue *domain.ExecutionProfile, override *domain.ExecutionTarget) domain.ExecutionTarget {
+func mergeExecutionTargetOverride(base domain.ExecutionTarget, override domain.ExecutionTargetOverride) (domain.ExecutionTarget, error) {
+	out := base
+	if override.Endpoint != "" {
+		out.Endpoint = override.Endpoint
+	}
+	if override.Model != "" {
+		out.Model = override.Model
+	}
+	if override.Temperature != nil {
+		if *override.Temperature < 0 || *override.Temperature > 2 {
+			return domain.ExecutionTarget{}, errors.New("temperature must be between 0 and 2")
+		}
+		out.Temperature = *override.Temperature
+	}
+	if override.MaxTokens != nil {
+		if *override.MaxTokens < 0 {
+			return domain.ExecutionTarget{}, errors.New("max_tokens must be greater than or equal to 0")
+		}
+		out.MaxTokens = *override.MaxTokens
+	}
+	if override.TopP != nil {
+		if *override.TopP < 0 || *override.TopP > 1 {
+			return domain.ExecutionTarget{}, errors.New("top_p must be between 0 and 1")
+		}
+		out.TopP = *override.TopP
+	}
+	if override.TimeoutSeconds != nil {
+		if *override.TimeoutSeconds < 0 {
+			return domain.ExecutionTarget{}, errors.New("timeout_seconds must be greater than or equal to 0")
+		}
+		out.TimeoutSeconds = *override.TimeoutSeconds
+	}
+	if strings.TrimSpace(override.ServiceTier) != "" {
+		out.ServiceTier = override.ServiceTier
+	}
+	if strings.TrimSpace(override.ReasoningEffort) != "" {
+		out.ReasoningEffort = override.ReasoningEffort
+	}
+	if strings.TrimSpace(override.APIKeyEnv) != "" {
+		out.APIKeyEnv = override.APIKeyEnv
+	}
+	if len(override.ExtraParams) > 0 {
+		out.ExtraParams = copyExtraParams(override.ExtraParams)
+	}
+	return out, nil
+}
+
+func resolveExecutionTarget(profileValue *domain.ExecutionProfile, override *domain.ExecutionTargetOverride) (domain.ExecutionTarget, error) {
 	out := defaults.ExecutionTargetDefault()
 	out = mergeExecutionTarget(out, executionProfileToTarget(profileValue))
 	if override != nil {
-		out = mergeExecutionTarget(out, *override)
+		var err error
+		out, err = mergeExecutionTargetOverride(out, *override)
+		if err != nil {
+			return domain.ExecutionTarget{}, err
+		}
 	}
-	return out
+	return out, nil
 }
 
 func validateAPIKeyEnv(apiKeyEnv string) error {
@@ -388,13 +438,6 @@ func executionProfileToTarget(p *domain.ExecutionProfile) domain.ExecutionTarget
 	if p == nil {
 		return domain.ExecutionTarget{}
 	}
-	cp := map[string]string(nil)
-	if len(p.ExtraParams) > 0 {
-		cp = make(map[string]string, len(p.ExtraParams))
-		for k, v := range p.ExtraParams {
-			cp[k] = v
-		}
-	}
 	return domain.ExecutionTarget{
 		Endpoint:        p.Endpoint,
 		Model:           p.Model,
@@ -405,10 +448,21 @@ func executionProfileToTarget(p *domain.ExecutionProfile) domain.ExecutionTarget
 		ServiceTier:     p.ServiceTier,
 		ReasoningEffort: p.ReasoningEffort,
 		APIKeyEnv:       p.APIKeyEnv,
-		ExtraParams:     cp,
+		ExtraParams:     copyExtraParams(p.ExtraParams),
 	}
 }
 
+func copyExtraParams(src map[string]any) map[string]any {
+	if len(src) == 0 {
+		return nil
+	}
+	cp := make(map[string]any, len(src))
+	for k, v := range src {
+		cp[k] = v
+	}
+	return cp
+}
+
 func resolveOutputContract(def *domain.PromptDefinition, override *domain.OutputContract) domain.OutputContract {
 	contract := def.Validation
 	if contract.Format == "" {

internal/usecase/runner_test.go

@@ -172,7 +172,7 @@ func TestRunnerPrepareWithExplicitProfileSelection(t *testing.T) {
 			"transcript": {Type: domain.ArtifactRefFile, URI: "a://t"},
 			"glossary":   {Type: domain.ArtifactRefFile, URI: "a://g"},
 		},
-		Execution: &domain.ExecutionTarget{Endpoint: "http://override/v1", Model: "m", Temperature: 0.3, TimeoutSeconds: 90},
+		Execution: &domain.ExecutionTargetOverride{Endpoint: "http://override/v1", Model: "m", Temperature: float64Ptr(0.3), TimeoutSeconds: intPtr(90)},
 	})
 	if err != nil {
 		t.Fatalf("expected no error, got %v", err)
@@ -272,11 +272,11 @@ func TestRunnerPrepareRuntimeOverrideBeatsSelectedProfileValue(t *testing.T) {
 		PromptID:  "p",
 		ProfileID: "exec",
 		Inputs:    singleInputRef(),
-		Execution: &domain.ExecutionTarget{
+		Execution: &domain.ExecutionTargetOverride{
 			Endpoint:       "http://override/v1",
 			Model:          "override-model",
-			Temperature:    0.7,
+			Temperature:    float64Ptr(0.7),
-			TimeoutSeconds: 30,
+			TimeoutSeconds: intPtr(30),
 			ServiceTier:    "flex",
 		},
 	})
@@ -294,6 +294,135 @@ func TestRunnerPrepareRuntimeOverrideBeatsSelectedProfileValue(t *testing.T) {
 	}
 }
 
+func TestRunnerPrepareRequestNumericOverridePresence(t *testing.T) {
+	tests := []struct {
+		name            string
+		override        *domain.ExecutionTargetOverride
+		wantTemperature float64
+		wantMaxTokens   int
+		wantTopP        float64
+		wantTimeoutSecs int
+	}{
+		{
+			name:            "omitted preserves profile values",
+			override:        &domain.ExecutionTargetOverride{},
+			wantTemperature: 0.7,
+			wantMaxTokens:   321,
+			wantTopP:        0.8,
+			wantTimeoutSecs: 45,
+		},
+		{
+			name:            "explicit zero temperature",
+			override:        &domain.ExecutionTargetOverride{Temperature: float64Ptr(0)},
+			wantTemperature: 0,
+			wantMaxTokens:   321,
+			wantTopP:        0.8,
+			wantTimeoutSecs: 45,
+		},
+		{
+			name:            "explicit zero max tokens",
+			override:        &domain.ExecutionTargetOverride{MaxTokens: intPtr(0)},
+			wantTemperature: 0.7,
+			wantMaxTokens:   0,
+			wantTopP:        0.8,
+			wantTimeoutSecs: 45,
+		},
+		{
+			name:            "explicit zero top p",
+			override:        &domain.ExecutionTargetOverride{TopP: float64Ptr(0)},
+			wantTemperature: 0.7,
+			wantMaxTokens:   321,
+			wantTopP:        0,
+			wantTimeoutSecs: 45,
+		},
+		{
+			name:            "explicit zero timeout",
+			override:        &domain.ExecutionTargetOverride{TimeoutSeconds: intPtr(0)},
+			wantTemperature: 0.7,
+			wantMaxTokens:   321,
+			wantTopP:        0.8,
+			wantTimeoutSecs: 0,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			runner := NewRunner(
+				&fakePromptRepo{def: promptDef(domain.FormatText, domain.ValidationNone, 0)},
+				&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{
+					"exec": {
+						ID:             "exec",
+						Endpoint:       "http://profile/v1",
+						Model:          "profile-model",
+						Temperature:    0.7,
+						MaxTokens:      321,
+						TopP:           0.8,
+						TimeoutSeconds: 45,
+					},
+				}},
+				defaultArtifactReader(),
+				defaultRenderer(),
+				&fakeLLM{forbid: true},
+				nil,
+			)
+
+			prepared, err := runner.Prepare(context.Background(), domain.RunRequest{
+				PromptID:  "p",
+				ProfileID: "exec",
+				Inputs:    singleInputRef(),
+				Execution: tc.override,
+			})
+			if err != nil {
+				t.Fatalf("expected no error, got %v", err)
+			}
+			got := prepared.EffectiveModelParams
+			if got.Temperature != tc.wantTemperature ||
+				got.MaxTokens != tc.wantMaxTokens ||
+				got.TopP != tc.wantTopP ||
+				got.TimeoutSeconds != tc.wantTimeoutSecs {
+				t.Fatalf("unexpected effective numeric settings: %+v", got)
+			}
+		})
+	}
+}
+
+func TestRunnerPrepareInvalidRequestNumericOverridesFail(t *testing.T) {
+	tests := []struct {
+		name     string
+		override *domain.ExecutionTargetOverride
+	}{
+		{name: "temperature below range", override: &domain.ExecutionTargetOverride{Temperature: float64Ptr(-0.1)}},
+		{name: "temperature above range", override: &domain.ExecutionTargetOverride{Temperature: float64Ptr(2.1)}},
+		{name: "max tokens below range", override: &domain.ExecutionTargetOverride{MaxTokens: intPtr(-1)}},
+		{name: "top p below range", override: &domain.ExecutionTargetOverride{TopP: float64Ptr(-0.1)}},
+		{name: "top p above range", override: &domain.ExecutionTargetOverride{TopP: float64Ptr(1.1)}},
+		{name: "timeout below range", override: &domain.ExecutionTargetOverride{TimeoutSeconds: intPtr(-1)}},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			runner := NewRunner(
+				&fakePromptRepo{def: promptDef(domain.FormatText, domain.ValidationNone, 0)},
+				&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{"exec": defaultExecutionProfile()}},
+				defaultArtifactReader(),
+				defaultRenderer(),
+				&fakeLLM{forbid: true},
+				nil,
+			)
+
+			_, err := runner.Prepare(context.Background(), domain.RunRequest{
+				PromptID:  "p",
+				ProfileID: "exec",
+				Inputs:    singleInputRef(),
+				Execution: tc.override,
+			})
+			if !errors.Is(err, ErrInvalidRequest) {
+				t.Fatalf("expected ErrInvalidRequest, got %v", err)
+			}
+		})
+	}
+}
+
 func TestRunnerPrepareSelectedProfileBeatsBuiltInDefault(t *testing.T) {
 	promptRepo := &fakePromptRepo{def: promptDef(domain.FormatText, domain.ValidationNone, 0)}
 	execRepo := &fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{
@@ -693,7 +822,7 @@ func TestRunnerRunSuccessful(t *testing.T) {
 			"transcript": {Type: domain.ArtifactRefFile, URI: "a://t"},
 			"glossary":   {Type: domain.ArtifactRefFile, URI: "a://g"},
 		},
-		Execution: &domain.ExecutionTarget{Endpoint: "http://override/v1", Model: "m", Temperature: 0.3, TimeoutSeconds: 90},
+		Execution: &domain.ExecutionTargetOverride{Endpoint: "http://override/v1", Model: "m", Temperature: float64Ptr(0.3), TimeoutSeconds: intPtr(90)},
 	})
 	if err != nil {
 		t.Fatalf("expected no error, got %v", err)
@@ -749,7 +878,7 @@ func TestRunnerRunAndPrepareResolveSameProfileAndEffectiveSettings(t *testing.T)
 		Inputs: map[string]domain.ArtifactRef{
 			"transcript": {Type: domain.ArtifactRefFile, URI: "a://t"},
 		},
-		Execution: &domain.ExecutionTarget{Endpoint: "http://override/v1", Model: "m", Temperature: 0.3, TimeoutSeconds: 90},
+		Execution: &domain.ExecutionTargetOverride{Endpoint: "http://override/v1", Model: "m", Temperature: float64Ptr(0.3), TimeoutSeconds: intPtr(90)},
 	}
 
 	prepared, err := runner.Prepare(context.Background(), req)
@@ -877,11 +1006,11 @@ func TestRunnerRunExplicitRuntimeOverrideBeatsSelectedProfileValue(t *testing.T)
 		PromptID:  "p",
 		ProfileID: "exec",
 		Inputs:    singleInputRef(),
-		Execution: &domain.ExecutionTarget{
+		Execution: &domain.ExecutionTargetOverride{
 			Endpoint:       "http://override/v1",
 			Model:          "override-model",
-			Temperature:    0.7,
+			Temperature:    float64Ptr(0.7),
-			TimeoutSeconds: 30,
+			TimeoutSeconds: intPtr(30),
 			ServiceTier:    "flex",
 		},
 	})
@@ -1016,7 +1145,7 @@ func TestRunnerRunRuntimeAPIKeyEnvOverrideWorks(t *testing.T) {
 		PromptID:  "p",
 		ProfileID: "exec",
 		Inputs:    singleInputRef(),
-		Execution: &domain.ExecutionTarget{APIKeyEnv: envName},
+		Execution: &domain.ExecutionTargetOverride{APIKeyEnv: envName},
 	})
 	if err != nil {
 		t.Fatalf("expected no error, got %v", err)
@@ -1041,7 +1170,7 @@ func TestRunnerRunRuntimeAPIKeyEnvOverrideBeatsProfile(t *testing.T) {
 		PromptID:  "p",
 		ProfileID: "exec",
 		Inputs:    singleInputRef(),
-		Execution: &domain.ExecutionTarget{APIKeyEnv: runtimeEnv},
+		Execution: &domain.ExecutionTargetOverride{APIKeyEnv: runtimeEnv},
 	})
 	if err != nil {
 		t.Fatalf("expected no error, got %v", err)
@@ -1182,7 +1311,7 @@ func TestRunnerRunStructuredRepairRemainsBoundedAndUsesEffectiveModelSettings(t
 		PromptID:  "p",
 		ProfileID: "exec",
 		Inputs:    singleInputRef(),
-		Execution: &domain.ExecutionTarget{Endpoint: "http://override/v1", Model: "override-model", TimeoutSeconds: 22},
+		Execution: &domain.ExecutionTargetOverride{Endpoint: "http://override/v1", Model: "override-model", TimeoutSeconds: intPtr(22)},
 	})
 	if err != nil {
 		t.Fatalf("expected no error, got %v", err)
@@ -1269,7 +1398,7 @@ func TestExecutionProfileToTargetPopulatesAllFieldsAndCopiesExtraParams(t *testi
 		ServiceTier:     "priority",
 		ReasoningEffort: "medium",
 		APIKeyEnv:       "SCRIPTORIUM_API_KEY",
-		ExtraParams: map[string]string{
+		ExtraParams: map[string]any{
 			"provider_option": "on",
 		},
 	}
@@ -1308,12 +1437,15 @@ func TestResolveExecutionTargetProfileValuesPopulateAllSupportedFields(t *testin
 		ServiceTier:     "priority",
 		ReasoningEffort: "low",
 		APIKeyEnv:       "PROFILE_KEY",
-		ExtraParams: map[string]string{
+		ExtraParams: map[string]any{
 			"profile_option": "enabled",
 		},
 	}
 
-	target := resolveExecutionTarget(profileValue, nil)
+	target, err := resolveExecutionTarget(profileValue, nil)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
 	if target.Endpoint != profileValue.Endpoint ||
 		target.Model != profileValue.Model ||
 		target.Temperature != profileValue.Temperature ||
@@ -1342,32 +1474,35 @@ func TestResolveExecutionTargetRuntimeOverridesBeatProfileForAllOverrideableFiel
 		ServiceTier:     "priority",
 		ReasoningEffort: "medium",
 		APIKeyEnv:       "PROFILE_KEY",
-		ExtraParams: map[string]string{
+		ExtraParams: map[string]any{
 			"profile_only": "yes",
 		},
 	}
-	override := &domain.ExecutionTarget{
+	override := &domain.ExecutionTargetOverride{
 		Endpoint:        "http://override/v1",
 		Model:           "override-model",
-		Temperature:     0.9,
+		Temperature:     float64Ptr(0.9),
-		MaxTokens:       111,
+		MaxTokens:       intPtr(111),
-		TopP:            0.5,
+		TopP:            float64Ptr(0.5),
-		TimeoutSeconds:  30,
+		TimeoutSeconds:  intPtr(30),
 		ServiceTier:     "flex",
 		ReasoningEffort: "high",
 		APIKeyEnv:       "RUNTIME_KEY",
-		ExtraParams: map[string]string{
+		ExtraParams: map[string]any{
 			"runtime_only": "yes",
 		},
 	}
 
-	target := resolveExecutionTarget(profileValue, override)
+	target, err := resolveExecutionTarget(profileValue, override)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
 	if target.Endpoint != override.Endpoint ||
 		target.Model != override.Model ||
-		target.Temperature != override.Temperature ||
+		target.Temperature != *override.Temperature ||
-		target.MaxTokens != override.MaxTokens ||
+		target.MaxTokens != *override.MaxTokens ||
-		target.TopP != override.TopP ||
+		target.TopP != *override.TopP ||
-		target.TimeoutSeconds != override.TimeoutSeconds ||
+		target.TimeoutSeconds != *override.TimeoutSeconds ||
 		target.ServiceTier != override.ServiceTier ||
 		target.ReasoningEffort != override.ReasoningEffort ||
 		target.APIKeyEnv != override.APIKeyEnv {
@@ -1411,12 +1546,12 @@ func TestMergeExecutionTargetEmptyStringOverridesDoNotErase(t *testing.T) {
 
 func TestMergeExecutionTargetEmptyExtraParamsDoesNotErase(t *testing.T) {
 	base := domain.ExecutionTarget{
-		ExtraParams: map[string]string{
+		ExtraParams: map[string]any{
 			"keep": "value",
 		},
 	}
 	override := domain.ExecutionTarget{
-		ExtraParams: map[string]string{},
+		ExtraParams: map[string]any{},
 	}
 
 	merged := mergeExecutionTarget(base, override)
@@ -1492,6 +1627,14 @@ func singleInputRef() map[string]domain.ArtifactRef {
 	return map[string]domain.ArtifactRef{"transcript": {Type: domain.ArtifactRefFile, URI: "a://ok"}}
 }
 
+func float64Ptr(v float64) *float64 {
+	return &v
+}
+
+func intPtr(v int) *int {
+	return &v
+}
+
 func newMinimalRunner(promptRepo *fakePromptRepo, execRepo *fakeExecutionProfileRepo) *Runner {
 	return NewRunner(
 		promptRepo,