diff --git a/assets/usage-check.txt b/assets/usage-check.txt
new file mode 100644
index 0000000..85acd61
--- /dev/null
+++ b/assets/usage-check.txt
@@ -0,0 +1,27 @@
+probitas check - Type-check scenario files
+
+Usage: probitas check [options] [paths...]
+
+Arguments:
+  [paths...]  Scenario files or directories
+              Defaults to current directory
+
+Options:
+  -h, --help             Show help message
+  --include <pattern>    Include pattern for file discovery
+  --exclude <pattern>    Exclude pattern for file discovery
+  --config <path>        Path to probitas config file
+  -v, --verbose          Verbose output
+  -q, --quiet            Suppress output
+  -d, --debug            Debug output
+
+Note:
+  Runs `deno check --no-config` on discovered scenario files.
+  Uses includes/excludes from probitas config (same as run/list).
+
+Examples:
+  probitas check                  # Check all scenario files
+  probitas check api/             # Check scenarios in api directory
+  probitas check --include "e2e/**/*.probitas.ts"
+
+Documentation: https://jsr-probitas.github.io/documents/
diff --git a/assets/usage-fmt.txt b/assets/usage-fmt.txt
new file mode 100644
index 0000000..a3627a3
--- /dev/null
+++ b/assets/usage-fmt.txt
@@ -0,0 +1,27 @@
+probitas fmt - Format scenario files
+
+Usage: probitas fmt [options] [paths...]
+
+Arguments:
+  [paths...]  Scenario files or directories
+              Defaults to current directory
+
+Options:
+  -h, --help             Show help message
+  --include <pattern>    Include pattern for file discovery
+  --exclude <pattern>    Exclude pattern for file discovery
+  --config <path>        Path to probitas config file
+  -v, --verbose          Verbose output
+  -q, --quiet            Suppress output
+  -d, --debug            Debug output
+
+Note:
+  Runs `deno fmt --no-config` on discovered scenario files.
+  Uses includes/excludes from probitas config (same as run/list).
+
+Examples:
+  probitas fmt                    # Format all scenario files
+  probitas fmt api/               # Format scenarios in api directory
+  probitas fmt --include "e2e/**/*.probitas.ts"
+
+Documentation: https://jsr-probitas.github.io/documents/
diff --git a/assets/usage-lint.txt b/assets/usage-lint.txt
new file mode 100644
index 0000000..faaec98
--- /dev/null
+++ b/assets/usage-lint.txt
@@ -0,0 +1,28 @@
+probitas lint - Lint scenario files
+
+Usage: probitas lint [options] [paths...]
+
+Arguments:
+  [paths...]  Scenario files or directories
+              Defaults to current directory
+
+Options:
+  -h, --help             Show help message
+  --include <pattern>    Include pattern for file discovery
+  --exclude <pattern>    Exclude pattern for file discovery
+  --config <path>        Path to probitas config file
+  -v, --verbose          Verbose output
+  -q, --quiet            Suppress output
+  -d, --debug            Debug output
+
+Note:
+  Runs `deno lint --no-config` on discovered scenario files.
+  Uses includes/excludes from probitas config (same as run/list).
+  Automatically excludes rules: no-import-prefix, no-unversioned-import
+
+Examples:
+  probitas lint                   # Lint all scenario files
+  probitas lint api/              # Lint scenarios in api directory
+  probitas lint --include "e2e/**/*.probitas.ts"
+
+Documentation: https://jsr-probitas.github.io/documents/
diff --git a/assets/usage.txt b/assets/usage.txt
index f08e888..3c7bc72 100644
--- a/assets/usage.txt
+++ b/assets/usage.txt
@@ -6,6 +6,9 @@ Commands:
   init     Initialize a new probitas project
   run      Run scenarios
   list     List available scenarios
+  fmt      Format scenario files (runs deno fmt)
+  lint     Lint scenario files (runs deno lint)
+  check    Type-check scenario files (runs deno check)
 
 Options:
   -h, --help     Show help message
diff --git a/src/commands/_deno.ts b/src/commands/_deno.ts
new file mode 100644
index 0000000..e363120
--- /dev/null
+++ b/src/commands/_deno.ts
@@ -0,0 +1,135 @@
+/**
+ * Shared helper for Deno subcommand execution
+ *
+ * Used by fmt, lint, and check commands to run corresponding deno commands
+ * on discovered scenario files.
+ *
+ * @module
+ */
+
+import { parseArgs } from "@std/cli";
+import { resolve } from "@std/path";
+import { configureLogging, getLogger, type LogLevel } from "@probitas/logger";
+import { discoverScenarioFiles } from "@probitas/discover";
+import { EXIT_CODE } from "../constants.ts";
+import { findProbitasConfigFile, loadConfig } from "../config.ts";
+import { createDiscoveryProgress } from "../progress.ts";
+import { readAsset } from "../utils.ts";
+
+const logger = getLogger("probitas", "cli", "deno");
+
+/**
+ * Options for running a Deno subcommand
+ */
+export interface DenoSubcommandOptions {
+  /** Asset file name for help text */
+  usageAsset: string;
+  /** Extra arguments to pass to the deno command */
+  extraArgs?: readonly string[];
+}
+
+/**
+ * Run a Deno subcommand on discovered scenario files
+ *
+ * @param subcommand - Deno subcommand to run (fmt, lint, check)
+ * @param args - Command-line arguments
+ * @param cwd - Current working directory
+ * @param options - Subcommand options
+ * @returns Exit code from the deno command
+ */
+export async function runDenoSubcommand(
+  subcommand: string,
+  args: string[],
+  cwd: string,
+  options: DenoSubcommandOptions,
+): Promise<number> {
+  try {
+    const parsed = parseArgs(args, {
+      string: ["config", "include", "exclude"],
+      boolean: ["help", "quiet", "verbose", "debug"],
+      collect: ["include", "exclude"],
+      alias: {
+        h: "help",
+        v: "verbose",
+        q: "quiet",
+        d: "debug",
+      },
+      default: {
+        include: undefined,
+        exclude: undefined,
+      },
+    });
+
+    if (parsed.help) {
+      const helpText = await readAsset(options.usageAsset);
+      console.log(helpText);
+      return EXIT_CODE.SUCCESS;
+    }
+
+    // Determine log level
+    const logLevel: LogLevel = parsed.debug
+      ? "debug"
+      : parsed.verbose
+      ? "info"
+      : parsed.quiet
+      ? "fatal"
+      : "warning";
+
+    try {
+      await configureLogging(logLevel);
+    } catch {
+      // Ignore - logging may already be configured
+    }
+
+    // Load probitas config (NOT deno.json)
+    const configPath = parsed.config ??
+      await findProbitasConfigFile(cwd, { parentLookup: true });
+    const config = configPath ? await loadConfig(configPath) : {};
+
+    // CLI > config
+    const includes = parsed.include ?? config?.includes;
+    const excludes = parsed.exclude ?? config?.excludes;
+
+    // Discover scenario files
+    const paths = parsed._.map(String).map((p) => resolve(cwd, p));
+    const discoveryProgress = parsed.quiet ? null : createDiscoveryProgress();
+    const scenarioFiles = await discoverScenarioFiles(
+      paths.length ? paths : [cwd],
+      { includes, excludes, onProgress: discoveryProgress?.onProgress },
+    );
+    discoveryProgress?.complete(scenarioFiles.length);
+
+    if (scenarioFiles.length === 0) {
+      console.warn("No scenario files found");
+      return EXIT_CODE.NOT_FOUND;
+    }
+
+    logger.debug(`Running deno ${subcommand}`, {
+      fileCount: scenarioFiles.length,
+    });
+
+    // Run deno command with --no-config
+    const denoArgs = [
+      subcommand,
+      "--no-config",
+      ...(options.extraArgs ?? []),
+      ...scenarioFiles,
+    ];
+
+    const command = new Deno.Command("deno", {
+      args: denoArgs,
+      cwd,
+      stdin: "inherit",
+      stdout: "inherit",
+      stderr: "inherit",
+    });
+
+    const { code } = await command.output();
+    return code;
+  } catch (err: unknown) {
+    logger.error(`deno ${subcommand} failed`, { error: err });
+    const m = err instanceof Error ? err.message : String(err);
+    console.error(`Error: ${m}`);
+    return EXIT_CODE.FAILURE;
+  }
+}
diff --git a/src/commands/check.ts b/src/commands/check.ts
new file mode 100644
index 0000000..209267d
--- /dev/null
+++ b/src/commands/check.ts
@@ -0,0 +1,25 @@
+/**
+ * Type-check command for Probitas CLI
+ *
+ * Runs `deno check --no-config` on discovered scenario files.
+ *
+ * @module
+ */
+
+import { runDenoSubcommand } from "./_deno.ts";
+
+/**
+ * Run the check command
+ *
+ * @param args - Command-line arguments
+ * @param cwd - Current working directory
+ * @returns Exit code
+ */
+export async function checkCommand(
+  args: string[],
+  cwd: string,
+): Promise<number> {
+  return await runDenoSubcommand("check", args, cwd, {
+    usageAsset: "usage-check.txt",
+  });
+}
diff --git a/src/commands/fmt.ts b/src/commands/fmt.ts
new file mode 100644
index 0000000..edc9b78
--- /dev/null
+++ b/src/commands/fmt.ts
@@ -0,0 +1,25 @@
+/**
+ * Format command for Probitas CLI
+ *
+ * Runs `deno fmt --no-config` on discovered scenario files.
+ *
+ * @module
+ */
+
+import { runDenoSubcommand } from "./_deno.ts";
+
+/**
+ * Run the fmt command
+ *
+ * @param args - Command-line arguments
+ * @param cwd - Current working directory
+ * @returns Exit code
+ */
+export async function fmtCommand(
+  args: string[],
+  cwd: string,
+): Promise<number> {
+  return await runDenoSubcommand("fmt", args, cwd, {
+    usageAsset: "usage-fmt.txt",
+  });
+}
diff --git a/src/commands/lint.ts b/src/commands/lint.ts
new file mode 100644
index 0000000..386817e
--- /dev/null
+++ b/src/commands/lint.ts
@@ -0,0 +1,27 @@
+/**
+ * Lint command for Probitas CLI
+ *
+ * Runs `deno lint --no-config` on discovered scenario files.
+ * Automatically excludes rules that conflict with scenario imports.
+ *
+ * @module
+ */
+
+import { runDenoSubcommand } from "./_deno.ts";
+
+/**
+ * Run the lint command
+ *
+ * @param args - Command-line arguments
+ * @param cwd - Current working directory
+ * @returns Exit code
+ */
+export async function lintCommand(
+  args: string[],
+  cwd: string,
+): Promise<number> {
+  return await runDenoSubcommand("lint", args, cwd, {
+    usageAsset: "usage-lint.txt",
+    extraArgs: ["--rules-exclude=no-import-prefix,no-unversioned-import"],
+  });
+}
diff --git a/src/commands/mod.ts b/src/commands/mod.ts
index 6f7a8bd..f433415 100644
--- a/src/commands/mod.ts
+++ b/src/commands/mod.ts
@@ -4,6 +4,9 @@
  * @module
  */
 
+export { checkCommand } from "./check.ts";
+export { fmtCommand } from "./fmt.ts";
 export { initCommand } from "./init.ts";
+export { lintCommand } from "./lint.ts";
 export { listCommand } from "./list.ts";
 export { runCommand } from "./run.ts";
diff --git a/src/main.ts b/src/main.ts
index fbd913d..5d119b8 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -7,7 +7,10 @@
 import { parseArgs } from "@std/cli";
 import { getLogger } from "@probitas/logger";
 import { EXIT_CODE } from "./constants.ts";
+import { checkCommand } from "./commands/check.ts";
+import { fmtCommand } from "./commands/fmt.ts";
 import { initCommand } from "./commands/init.ts";
+import { lintCommand } from "./commands/lint.ts";
 import { listCommand } from "./commands/list.ts";
 import { runCommand } from "./commands/run.ts";
 import { getVersionInfo, readAsset } from "./utils.ts";
@@ -78,6 +81,15 @@ export async function main(args: string[]): Promise<number> {
     case "list":
       return await listCommand(commandArgs, cwd);
 
+    case "fmt":
+      return await fmtCommand(commandArgs, cwd);
+
+    case "lint":
+      return await lintCommand(commandArgs, cwd);
+
+    case "check":
+      return await checkCommand(commandArgs, cwd);
+
     default:
       console.warn(`Unknown command: ${command}`);
       console.warn("Run 'probitas --help' for usage information");