diff --git a/src/services/execution-plan.service.ts b/src/services/execution-plan.service.ts
index 777f72b..9fa6c72 100644
--- a/src/services/execution-plan.service.ts
+++ b/src/services/execution-plan.service.ts
@@ -4,6 +4,7 @@ import * as path from 'node:path';
 import {
   getFlowsToRunInSequence,
   isFlowFile,
+  isWorkspaceConfigFile,
   processDependencies,
   readDirectory,
   readTestYamlFileAsJson,
@@ -198,16 +199,18 @@ function extractDeviceCloudOverrides(
 /**
  * Generate execution plan for a single flow file
  * @param normalizedInput - Normalized path to the flow file
- * @param configFile - Optional custom config file path
+ * @param resolvedConfigFile - Optional absolute path to a custom config file
  * @returns Execution plan for the single file with dependencies
  */
 async function planSingleFile(
   normalizedInput: string,
-  configFile?: string,
+  resolvedConfigFile?: string,
 ): Promise<IExecutionPlan> {
+  const inputBasename = path.basename(normalizedInput);
   if (
-    normalizedInput.endsWith('config.yaml') ||
-    normalizedInput.endsWith('config.yml')
+    inputBasename === 'config.yaml' ||
+    inputBasename === 'config.yml' ||
+    isWorkspaceConfigFile(normalizedInput)
   ) {
     throw new Error(
       'If using config.yaml, pass the workspace folder path, not the config file or a custom path via --config',
@@ -224,13 +227,14 @@ async function planSingleFile(
   }
 
   let workspaceConfig: IWorkspaceConfig | undefined;
-  if (configFile) {
-    const configFilePath = path.resolve(process.cwd(), configFile);
-    if (!fs.existsSync(configFilePath)) {
-      throw new Error(`Config file does not exist: ${configFilePath}`);
+  if (resolvedConfigFile) {
+    if (!fs.existsSync(resolvedConfigFile)) {
+      throw new Error(`Config file does not exist: ${resolvedConfigFile}`);
     }
 
-    workspaceConfig = readYamlFileAsJson(configFilePath) as IWorkspaceConfig;
+    workspaceConfig = readYamlFileAsJson(
+      resolvedConfigFile,
+    ) as IWorkspaceConfig;
   }
 
   const checkedDependancies = await checkDependencies(normalizedInput);
@@ -249,7 +253,7 @@ async function planSingleFile(
  * @param workspaceConfig - Workspace configuration containing flow globs
  * @param normalizedInput - Normalized path to the workspace directory
  * @param unfilteredFlowFiles - List of all discovered flow files
- * @param configFile - Optional custom config file path
+ * @param resolvedConfigFile - Optional absolute path to a custom config file
  * @param excludeFlows - --exclude-flows patterns to re-apply to glob matches
  * @returns Filtered list of flow file paths matching the globs
  */
@@ -257,9 +261,24 @@ async function applyFlowGlobs(
   workspaceConfig: IWorkspaceConfig,
   normalizedInput: string,
   unfilteredFlowFiles: string[],
-  configFile?: string,
+  resolvedConfigFile?: string,
   excludeFlows?: string[],
 ): Promise<string[]> {
+  // Both branches compare absolute paths, so `--config ./x.yml` and
+  // `--config /abs/x.yml` behave identically, and a same-named file in a
+  // sibling directory is never mistaken for the active config.
+  const activeConfig = resolvedConfigFile
+    ? path.normalize(resolvedConfigFile)
+    : undefined;
+  const isExcludedConfig = (absolutePath: string): boolean => {
+    const base = path.basename(absolutePath);
+    if (base === 'config.yaml' || base === 'config.yml') return true;
+    return (
+      activeConfig !== undefined &&
+      path.normalize(absolutePath) === activeConfig
+    );
+  };
+
   if (workspaceConfig.flows) {
     const globs = workspaceConfig.flows.map((g) => g);
     // fs.globSync lands in Node 22; the CLI's `engines.node` already requires it.
@@ -273,31 +292,19 @@ async function applyFlowGlobs(
       }
     });
 
+    // Resolve before filtering: glob matches are relative to normalizedInput,
+    // so comparing them against the config path only ever worked when the
+    // config happened to sit at the workspace root.
     const globbedFlowFiles = matchedFiles
-      .filter((file: string) => {
-        if (file === 'config.yaml' || file === 'config.yml') return false;
-        if (configFile && file === path.basename(configFile)) return false;
-        if (!file.endsWith('.yaml') && !file.endsWith('.yml')) return false;
-        const pathParts = file.split(path.sep);
-        for (const part of pathParts) {
-          if (part.endsWith('.app')) return false;
-        }
-
-        return true;
-      })
-      .map((file) => path.resolve(normalizedInput, file));
+      .map((file) => path.resolve(normalizedInput, file))
+      .filter((file) => !isExcludedConfig(file) && isFlowFile(file));
 
     // Re-globbing from disk bypasses the earlier --exclude-flows filter, so
     // re-apply it here or excluded flows sneak back in via `flows:` globs.
     return filterFlowFiles(globbedFlowFiles, excludeFlows);
   }
 
-  return unfilteredFlowFiles.filter(
-    (file) =>
-      !file.endsWith('config.yaml') &&
-      !file.endsWith('config.yml') &&
-      (!configFile || !file.endsWith(configFile)),
-  );
+  return unfilteredFlowFiles.filter((file) => !isExcludedConfig(file));
 }
 
 /**
@@ -382,6 +389,9 @@ export async function plan(options: PlanOptions): Promise<IExecutionPlan> {
   } = options;
   const normalizedInput = path.normalize(input);
   const flowMetadata: Record<string, Record<string, unknown>> = {};
+  const resolvedConfigFile = configFile
+    ? path.resolve(process.cwd(), configFile)
+    : undefined;
 
   if (!fs.existsSync(normalizedInput)) {
     throw new Error(
@@ -390,7 +400,7 @@ export async function plan(options: PlanOptions): Promise<IExecutionPlan> {
   }
 
   if (fs.lstatSync(normalizedInput).isFile()) {
-    return planSingleFile(normalizedInput, configFile);
+    return planSingleFile(normalizedInput, resolvedConfigFile);
   }
 
   let unfilteredFlowFiles = await readDirectory(normalizedInput, isFlowFile);
@@ -405,13 +415,14 @@ export async function plan(options: PlanOptions): Promise<IExecutionPlan> {
   unfilteredFlowFiles = filterFlowFiles(unfilteredFlowFiles, excludeFlows);
 
   let workspaceConfig: IWorkspaceConfig;
-  if (configFile) {
-    const configFilePath = path.resolve(process.cwd(), configFile);
-    if (!fs.existsSync(configFilePath)) {
-      throw new Error(`Config file does not exist: ${configFilePath}`);
+  if (resolvedConfigFile) {
+    if (!fs.existsSync(resolvedConfigFile)) {
+      throw new Error(`Config file does not exist: ${resolvedConfigFile}`);
     }
 
-    workspaceConfig = readYamlFileAsJson(configFilePath) as IWorkspaceConfig;
+    workspaceConfig = readYamlFileAsJson(
+      resolvedConfigFile,
+    ) as IWorkspaceConfig;
   } else {
     workspaceConfig = getWorkspaceConfig(normalizedInput, unfilteredFlowFiles);
   }
@@ -420,10 +431,32 @@ export async function plan(options: PlanOptions): Promise<IExecutionPlan> {
     workspaceConfig,
     normalizedInput,
     unfilteredFlowFiles,
-    configFile,
+    resolvedConfigFile,
     excludeFlows,
   );
 
+  // The exclusions above are filename-based: they only catch
+  // `config.yaml`/`config.yml` and the active --config target. Any other
+  // workspace config sharing the folder (a second CI workflow's, say) is still
+  // on the list and would be parsed as a flow, so drop config-shaped files by
+  // shape — see dcd-cli#99.
+  const configShapedFiles = new Set(
+    unfilteredFlowFiles.filter((file) => isWorkspaceConfigFile(file)),
+  );
+  if (configShapedFiles.size > 0) {
+    if (debug) {
+      console.log(
+        `[DEBUG] Skipping ${configShapedFiles.size} workspace config file(s): ${[
+          ...configShapedFiles,
+        ].join(', ')}`,
+      );
+    }
+
+    unfilteredFlowFiles = unfilteredFlowFiles.filter(
+      (file) => !configShapedFiles.has(file),
+    );
+  }
+
   if (unfilteredFlowFiles.length === 0) {
     const error = workspaceConfig.flows
       ? new Error(
diff --git a/src/services/execution-plan.utils.ts b/src/services/execution-plan.utils.ts
index b117759..3b7f24b 100644
--- a/src/services/execution-plan.utils.ts
+++ b/src/services/execution-plan.utils.ts
@@ -60,6 +60,53 @@ export function isFlowFile(filePath: string): boolean {
   return filePath.endsWith('.yaml') || filePath.endsWith('.yml');
 }
 
+/**
+ * Top-level keys that only ever appear in a workspace config (see
+ * IWorkspaceConfig in execution-plan.service.ts). Deliberately excludes keys
+ * Maestro also allows in flow front matter — appId, name, tags, env,
+ * onFlowStart, onFlowComplete, jsEngine.
+ */
+const WORKSPACE_CONFIG_KEYS = new Set([
+  'excludeTags',
+  'executionOrder',
+  'flows',
+  'includeTags',
+  'local',
+  'notifications',
+  'platform',
+]);
+
+/**
+ * True when a YAML file is a workspace config rather than a runnable flow.
+ *
+ * A flow is either `front matter --- steps` or a bare steps array; a
+ * single-document top-level map carrying workspace-config keys is neither, and
+ * left in the flow list it blows up processDependencies with "Expected an array
+ * of steps". Detection is by shape, not filename, so several named configs can
+ * coexist in one folder (dcd-cli#99). Requiring a recognised config key — not
+ * just "single document, top-level map" — keeps a flow that is merely *missing*
+ * its `---` separator loud rather than silently dropped.
+ *
+ * @param filePath - Path to the YAML file to classify
+ * @returns Whether the file is a workspace config rather than a flow
+ */
+export function isWorkspaceConfigFile(filePath: string): boolean {
+  let parsed;
+  try {
+    parsed = readTestYamlFileAsJson(filePath);
+  } catch {
+    // Unparseable — leave it in the flow list so the existing error path reports it.
+    return false;
+  }
+
+  const { config, testSteps } = parsed;
+  if (config !== null) return false; // has `---` front matter → flow
+  if (Array.isArray(testSteps)) return false; // bare steps array → flow
+  if (!testSteps || typeof testSteps !== 'object') return false;
+
+  return Object.keys(testSteps).some((key) => WORKSPACE_CONFIG_KEYS.has(key));
+}
+
 export const readYamlFileAsJson = (filePath: string) => {
   try {
     const normalizedPath = path.normalize(filePath);
diff --git a/test/integration/cloud.integration.test.ts b/test/integration/cloud.integration.test.ts
index 7d052af..8ac4c93 100644
--- a/test/integration/cloud.integration.test.ts
+++ b/test/integration/cloud.integration.test.ts
@@ -287,6 +287,127 @@ appId: com.example.app
     });
   });
 
+  // Regression cover for dcd-cli#99: config files were excluded from flow
+  // discovery by *filename* (literal config.yaml/config.yml plus the exact
+  // --config target), so a second workspace config sharing the folder was
+  // parsed as a flow and blew up with "Expected an array of steps".
+  // These must pass the flow *directory* — the --config tests below pass a
+  // single file, which short-circuits into planSingleFile and never reaches
+  // flow discovery.
+  describe('workspace config discovery', () => {
+    let workspaceDir: string;
+    let buildConfig: string;
+    let updateConfig: string;
+    let globConfig: string;
+
+    before(() => {
+      workspaceDir = fs.mkdtempSync(path.join(os.tmpdir(), 'dcd-test-ws-'));
+
+      fs.writeFileSync(
+        path.join(workspaceDir, 'flow.yaml'),
+        `appId: com.example.app
+---
+- launchApp
+- tapOn: "Login"
+`,
+      );
+
+      // A genuine flow whose name merely ends in "config.yaml". The old
+      // unanchored endsWith() dropped it; it must run.
+      fs.writeFileSync(
+        path.join(workspaceDir, 'smoke-config.yaml'),
+        `appId: com.example.app
+name: smoke-config
+---
+- launchApp
+`,
+      );
+
+      // Two sibling workspace configs with custom names, as a folder serving
+      // several CI workflows would have. Neither is a flow.
+      buildConfig = path.join(workspaceDir, 'config_build.yml');
+      fs.writeFileSync(
+        buildConfig,
+        `flows:
+  - ./**/*.yaml
+includeTags:
+  - build
+`,
+      );
+
+      // Deliberately carries no tag or flow filtering, so when it is the active
+      // --config it can't mask the bug by filtering its sibling away first.
+      updateConfig = path.join(workspaceDir, 'config_update.yml');
+      fs.writeFileSync(
+        updateConfig,
+        `platform:
+  android:
+    disableAnimations: true
+`,
+      );
+
+      globConfig = path.join(workspaceDir, 'config_glob.yml');
+      fs.writeFileSync(
+        globConfig,
+        `flows:
+  - ./**/*.yaml
+  - ./**/*.yml
+`,
+      );
+    });
+
+    after(() => {
+      if (fs.existsSync(workspaceDir)) {
+        fs.rmSync(workspaceDir, { force: true, recursive: true });
+      }
+    });
+
+    it('should ignore sibling config files not named in --config', async () => {
+      const command = `${CLI} cloud ${androidAppFile} "${workspaceDir}" --api-key ${mockApiKey} --api-url ${mockApiUrl} --config "${updateConfig}" --dry-run`;
+
+      const { stdout } = await exec(command, { timeout: 15_000 });
+      expect(stdout).to.include('The following tests would have been run');
+      expect(stdout).to.include('flow.yaml');
+      expect(stdout).to.not.include('config_build.yml');
+      expect(stdout).to.not.include('config_glob.yml');
+      expect(stdout).to.not.include('Expected an array of steps');
+    });
+
+    it('should ignore config-shaped files when no --config is passed', async () => {
+      const command = `${CLI} cloud ${androidAppFile} "${workspaceDir}" --api-key ${mockApiKey} --api-url ${mockApiUrl} --debug --dry-run`;
+
+      const { stdout } = await exec(command, { timeout: 15_000 });
+      expect(stdout).to.include('flow.yaml');
+      expect(stdout).to.include('[DEBUG] Skipping 3 workspace config file(s)');
+      expect(stdout).to.not.include('Expected an array of steps');
+    });
+
+    it('should ignore config-shaped files matched by a flows glob', async () => {
+      const command = `${CLI} cloud ${androidAppFile} "${workspaceDir}" --api-key ${mockApiKey} --api-url ${mockApiUrl} --config "${globConfig}" --dry-run`;
+
+      const { stdout } = await exec(command, { timeout: 15_000 });
+      expect(stdout).to.include('flow.yaml');
+      expect(stdout).to.not.include('config_build.yml');
+      expect(stdout).to.not.include('config_update.yml');
+      expect(stdout).to.not.include('Expected an array of steps');
+    });
+
+    it('should run a flow whose filename merely ends in config.yaml', async () => {
+      const command = `${CLI} cloud ${androidAppFile} "${workspaceDir}" --api-key ${mockApiKey} --api-url ${mockApiUrl} --config "${updateConfig}" --dry-run`;
+
+      const { stdout } = await exec(command, { timeout: 15_000 });
+      expect(stdout).to.include('smoke-config.yaml');
+    });
+
+    it('should reject a custom-named config passed as the flow input', async () => {
+      const command = `${CLI} cloud ${androidAppFile} "${buildConfig}" --api-key ${mockApiKey} --api-url ${mockApiUrl} --dry-run`;
+
+      const { output } = await runExpectingFailure(command);
+      expect(output).to.include('pass the workspace folder path');
+      expect(output).to.not.include('Expected an array of steps');
+    });
+  });
+
   describe('file and binary management', () => {
     it('should support app binary ID instead of file', async () => {
       const command = `${CLI} cloud --app-binary-id test-binary-123 ${testFlowFile} --api-key ${mockApiKey} --api-url ${mockApiUrl} --dry-run`;