diff --git a/site/src/components/RichParameterInput/RichParameterInput.stories.tsx b/site/src/components/RichParameterInput/RichParameterInput.stories.tsx
index dbeac4dbdcb72..3ec838272e7c6 100644
--- a/site/src/components/RichParameterInput/RichParameterInput.stories.tsx
+++ b/site/src/components/RichParameterInput/RichParameterInput.stories.tsx
@@ -99,6 +99,38 @@ export const NumberType: Story = {
 	},
 };
 
+export const NumberTypeWithIncreasingMonotonicity: Story = {
+	args: {
+		value: 4,
+		id: "number_parameter",
+		parameter: createTemplateVersionParameter({
+			name: "number_parameter",
+			type: "number",
+			description: "Numeric parameter",
+			default_value: "",
+			validation_min: 0,
+			validation_max: 10,
+			validation_monotonic: "increasing",
+		}),
+	},
+};
+
+export const NumberTypeWithDecreasingMonotonicity: Story = {
+	args: {
+		value: 4,
+		id: "number_parameter",
+		parameter: createTemplateVersionParameter({
+			name: "number_parameter",
+			type: "number",
+			description: "Numeric parameter",
+			default_value: "",
+			validation_min: 0,
+			validation_max: 10,
+			validation_monotonic: "decreasing",
+		}),
+	},
+};
+
 export const BooleanType: Story = {
 	args: {
 		value: "false",
diff --git a/site/src/components/RichParameterInput/RichParameterInput.tsx b/site/src/components/RichParameterInput/RichParameterInput.tsx
index 92c7b528936a9..9919fca44b592 100644
--- a/site/src/components/RichParameterInput/RichParameterInput.tsx
+++ b/site/src/components/RichParameterInput/RichParameterInput.tsx
@@ -3,6 +3,7 @@ import ErrorOutline from "@mui/icons-material/ErrorOutline";
 import Button from "@mui/material/Button";
 import FormControlLabel from "@mui/material/FormControlLabel";
 import FormHelperText from "@mui/material/FormHelperText";
+import type { InputBaseComponentProps } from "@mui/material/InputBase";
 import Radio from "@mui/material/Radio";
 import RadioGroup from "@mui/material/RadioGroup";
 import TextField, { type TextFieldProps } from "@mui/material/TextField";
@@ -217,6 +218,7 @@ export const RichParameterInput: FC<RichParameterInputProps> = ({
 					onChange={onChange}
 					size={size}
 					parameter={parameter}
+					parameterAutofill={parameterAutofill}
 				/>
 				{!parameter.ephemeral &&
 					autofillSource === "user_history" &&
@@ -250,6 +252,7 @@ const RichParameterField: FC<RichParameterInputProps> = ({
 	disabled,
 	onChange,
 	parameter,
+	parameterAutofill,
 	value,
 	size,
 	...props
@@ -375,6 +378,30 @@ const RichParameterField: FC<RichParameterInputProps> = ({
 		);
 	}
 
+	let inputProps: InputBaseComponentProps = {};
+	if (parameter.type === "number") {
+		switch (parameter.validation_monotonic) {
+			case "increasing":
+				inputProps = {
+					max: parameter.validation_max,
+					min: parameterAutofill?.value,
+				};
+				break;
+			case "decreasing":
+				inputProps = {
+					max: parameterAutofill?.value,
+					min: parameter.validation_min,
+				};
+				break;
+			default:
+				inputProps = {
+					max: parameter.validation_max,
+					min: parameter.validation_min,
+				};
+				break;
+		}
+	}
+
 	// A text field can technically handle all cases!
 	// As other cases become more prominent (like filtering for numbers),
 	// we should break this out into more finely scoped input fields.
@@ -389,6 +416,7 @@ const RichParameterField: FC<RichParameterInputProps> = ({
 			required={parameter.required}
 			placeholder={parameter.default_value}
 			value={value}
+			inputProps={inputProps}
 			onChange={(event) => {
 				onChange(event.target.value);
 			}}
diff --git a/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersForm.tsx b/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersForm.tsx
index db0667ea8eba7..658b998a7b86c 100644
--- a/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersForm.tsx
+++ b/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersForm.tsx
@@ -112,6 +112,9 @@ export const WorkspaceParametersForm: FC<WorkspaceParameterFormProps> = ({
 											);
 										}}
 										parameter={parameter}
+										parameterAutofill={autofillParams?.find(
+											({ name }) => name === parameter.name,
+										)}
 									/>
 								) : null,
 							)}
diff --git a/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersPage.test.tsx b/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersPage.test.tsx
index 4c97a40e33139..667f529d9e96a 100644
--- a/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersPage.test.tsx
+++ b/site/src/pages/WorkspaceSettingsPage/WorkspaceParametersPage/WorkspaceParametersPage.test.tsx
@@ -60,7 +60,7 @@ test("Submit the workspace settings page successfully", async () => {
 		{ exact: false },
 	);
 	await user.clear(parameter2);
-	await user.type(parameter2, "1");
+	await user.type(parameter2, "3");
 	await user.click(
 		within(form).getByRole("button", { name: "Submit and restart" }),
 	);
@@ -70,7 +70,7 @@ test("Submit the workspace settings page successfully", async () => {
 			transition: "start",
 			rich_parameter_values: [
 				{ name: MockTemplateVersionParameter1.name, value: "new-value" },
-				{ name: MockTemplateVersionParameter2.name, value: "1" },
+				{ name: MockTemplateVersionParameter2.name, value: "3" },
 			],
 		});
 	});