diff --git a/packages/dev/mcp/s2/scripts/build-data.mjs b/packages/dev/mcp/s2/scripts/build-data.mjs
index 8145ee77aa6..bec0322c838 100644
--- a/packages/dev/mcp/s2/scripts/build-data.mjs
+++ b/packages/dev/mcp/s2/scripts/build-data.mjs
@@ -1,8 +1,11 @@
 #!/usr/bin/env node
+import {createRequire} from 'module';
 import fg from 'fast-glob';
 import {fileURLToPath, pathToFileURL} from 'url';
 import fs from 'fs';
 import path from 'path';
+// eslint-disable-next-line rulesdir/imports
+import * as ts from 'typescript';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -13,6 +16,7 @@ const ICONS_DIR = path.resolve(REPO_ROOT, 'packages/@react-spectrum/s2/s2wf-icon
 const ILLUSTRATIONS_DIR = path.resolve(REPO_ROOT, 'packages/@react-spectrum/s2/spectrum-illustrations/linear');
 const ICON_ALIASES_JS = path.resolve(REPO_ROOT, 'packages/dev/s2-docs/src/iconAliases.js');
 const ILLUSTRATION_ALIASES_JS = path.resolve(REPO_ROOT, 'packages/dev/s2-docs/src/illustrationAliases.js');
+const STYLE_PROPERTIES_TS = path.resolve(REPO_ROOT, 'packages/dev/s2-docs/src/styleProperties.ts');
 
 function ensureDir(p) {
   fs.mkdirSync(p, {recursive: true});
@@ -24,6 +28,23 @@ function writeJson(file, data) {
   console.log('Wrote', path.relative(REPO_ROOT, file));
 }
 
+async function importTsModule(tsFilePath) {
+  if (!fs.existsSync(tsFilePath)) {
+    throw new Error(`TS module not found: ${tsFilePath}`);
+  }
+  const sourceText = fs.readFileSync(tsFilePath, 'utf8');
+  const result = ts.transpileModule(sourceText, {
+    fileName: tsFilePath,
+    compilerOptions: {
+      target: ts.ScriptTarget.ES2022,
+      module: ts.ModuleKind.ESNext,
+      esModuleInterop: true
+    }
+  });
+  const url = `data:text/javascript;base64,${Buffer.from(result.outputText, 'utf8').toString('base64')}`;
+  return import(url);
+}
+
 function buildIconNames() {
   if (!fs.existsSync(ICONS_DIR)) {
     throw new Error(`Icons directory not found: ${ICONS_DIR}`);
@@ -61,6 +82,107 @@ async function loadAliases(modPath, exportName) {
   return mod[exportName] ?? {};
 }
 
+function buildBaseColorKeysFromSpectrumTokens(tokens) {
+  const keys = new Set();
+
+  // Matches spectrum-theme.ts
+  keys.add('transparent');
+  keys.add('black');
+  keys.add('white');
+
+  const addScale = (scale) => {
+    const re = new RegExp(`^${scale}-\\d+$`);
+    for (const tokenName of Object.keys(tokens)) {
+      if (re.test(tokenName)) {
+        // Match @react-spectrum/s2/style/tokens.ts behavior: strip "-color" in the middle.
+        keys.add(tokenName.replace('-color', ''));
+      }
+    }
+  };
+
+  // Global color scales
+  for (const scale of [
+    'gray', 'blue', 'red', 'orange', 'yellow', 'chartreuse', 'celery', 'green',
+    'seafoam', 'cyan', 'indigo', 'purple', 'fuchsia', 'magenta', 'pink',
+    'turquoise', 'brown', 'silver', 'cinnamon'
+  ]) {
+    addScale(scale);
+  }
+
+  // Semantic color scales
+  for (const scale of ['accent-color', 'informative-color', 'negative-color', 'notice-color', 'positive-color']) {
+    addScale(scale);
+  }
+
+  // Simple transparent scales (names remain unchanged)
+  for (const scale of ['transparent-white', 'transparent-black']) {
+    const re = new RegExp(`^${scale}-\\d+$`);
+    for (const tokenName of Object.keys(tokens)) {
+      if (re.test(tokenName)) {
+        keys.add(tokenName);
+      }
+    }
+  }
+
+  // Overlay scale keys (derived in tokens.ts, we only need the names here)
+  for (const n of [25, 50, 75, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000]) {
+    keys.add(`transparent-overlay-${n}`);
+  }
+
+  // High contrast keywords (matches spectrum-theme.ts)
+  for (const k of ['Background', 'ButtonBorder', 'ButtonFace', 'ButtonText', 'Field', 'Highlight', 'HighlightText', 'GrayText', 'Mark', 'LinkText']) {
+    keys.add(k);
+  }
+
+  return Array.from(keys).sort((a, b) => a.localeCompare(b));
+}
+
+function buildExpandedStyleMacroPropertyValues(styleProperties, spacingTypeValues, baseColorKeys) {
+  const out = {};
+
+  for (const [propertyName, def] of Object.entries(styleProperties)) {
+    const values = [];
+    const seen = new Set();
+
+    const pushUnique = (items) => {
+      for (const v of items) {
+        const s = String(v);
+        if (!seen.has(s)) {
+          seen.add(s);
+          values.push(s);
+        }
+      }
+    };
+
+    // Expand 'baseColors' placeholder into actual color token names.
+    const expandedBase = [];
+    for (const v of def.values ?? []) {
+      if (v === 'baseColors') {
+        expandedBase.push(...baseColorKeys);
+      } else {
+        expandedBase.push(v);
+      }
+    }
+    pushUnique(expandedBase);
+
+    // Expand spacing type placeholders into the actual numeric values shown in docs.
+    const additionalTypes = Array.isArray(def.additionalTypes) ? def.additionalTypes : [];
+    if (additionalTypes.includes('baseSpacing')) {
+      pushUnique(spacingTypeValues?.baseSpacing ?? []);
+    }
+    if (additionalTypes.includes('negativeSpacing')) {
+      pushUnique(spacingTypeValues?.negativeSpacing ?? []);
+    }
+
+    out[propertyName] = {
+      values,
+      additionalTypes
+    };
+  }
+
+  return out;
+}
+
 async function main() {
   const icons = buildIconNames();
   const illustrations = buildIllustrationNames();
@@ -71,6 +193,22 @@ async function main() {
   writeJson(path.join(OUT_DIR, 'illustrations.json'), illustrations);
   writeJson(path.join(OUT_DIR, 'iconAliases.json'), iconAliases);
   writeJson(path.join(OUT_DIR, 'illustrationAliases.json'), illustrationAliases);
+
+  // Style macro property definitions
+  const stylePropsMod = await importTsModule(STYLE_PROPERTIES_TS);
+  const propertyCategories = ['color', 'dimensions', 'text', 'effects', 'layout', 'misc', 'conditions'];
+  const styleProperties = {};
+  for (const category of propertyCategories) {
+    Object.assign(styleProperties, stylePropsMod.getPropertyDefinitions(category));
+  }
+  Object.assign(styleProperties, stylePropsMod.getShorthandDefinitions());
+  writeJson(path.join(OUT_DIR, 'styleProperties.json'), styleProperties);
+
+  const require = createRequire(import.meta.url);
+  const spectrumTokens = require('@adobe/spectrum-tokens/dist/json/variables.json');
+  const baseColorKeys = buildBaseColorKeysFromSpectrumTokens(spectrumTokens);
+  const expanded = buildExpandedStyleMacroPropertyValues(styleProperties, stylePropsMod.spacingTypeValues, baseColorKeys);
+  writeJson(path.join(OUT_DIR, 'styleMacroPropertyValues.json'), expanded);
 }
 
 main().catch((err) => {
diff --git a/packages/dev/mcp/s2/src/index.ts b/packages/dev/mcp/s2/src/index.ts
index e71b5ad9c0c..b8a8418cd76 100644
--- a/packages/dev/mcp/s2/src/index.ts
+++ b/packages/dev/mcp/s2/src/index.ts
@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 /// <reference types="node" />
 import {errorToString} from '../../shared/src/utils.js';
-import {listIconNames, listIllustrationNames, loadIconAliases, loadIllustrationAliases} from './s2-data.js';
+import {listIconNames, listIllustrationNames, loadIconAliases, loadIllustrationAliases, loadStyleMacroPropertyValues} from './s2-data.js';
 import type {McpServer} from '@modelcontextprotocol/sdk/server/mcp.js';
 import {startServer} from '../../shared/src/server.js';
 import {z} from 'zod';
@@ -87,6 +87,39 @@ import {z} from 'zod';
           return {content: [{type: 'text', text: JSON.stringify(Array.from(results).sort((a, b) => a.localeCompare(b)), null, 2)}]};
         }
       );
+
+      server.registerTool(
+        'get_style_macro_property_values',
+        {
+          title: 'Get style macro property values',
+          description: 'Returns the allowed values for a given S2 style macro property (including expanded color/spacing value lists where applicable).',
+          inputSchema: {propertyName: z.string()}
+        },
+        async ({propertyName}) => {
+          const name = String(propertyName ?? '').trim();
+          if (!name) {
+            throw new Error('Provide a non-empty propertyName.');
+          }
+
+          const all = loadStyleMacroPropertyValues();
+          let def = all[name];
+          if (!def) {
+            // fallback to case-insensitive lookup
+            const lower = name.toLowerCase();
+            const matchKey = Object.keys(all).find(k => k.toLowerCase() === lower);
+            if (matchKey) {
+              def = all[matchKey];
+            }
+          }
+
+          if (!def) {
+            const available = Object.keys(all).sort((a, b) => a.localeCompare(b));
+            throw new Error(`Unknown style macro property '${name}'. Available properties: ${available.join(', ')}`);
+          }
+
+          return {content: [{type: 'text', text: JSON.stringify(def, null, 2)}]};
+        }
+      );
     });
   } catch (err) {
     console.error(errorToString(err));
diff --git a/packages/dev/mcp/s2/src/s2-data.ts b/packages/dev/mcp/s2/src/s2-data.ts
index 8b37337cf18..7e3fdcc5a87 100644
--- a/packages/dev/mcp/s2/src/s2-data.ts
+++ b/packages/dev/mcp/s2/src/s2-data.ts
@@ -9,6 +9,7 @@ let iconIdCache: string[] | null = null;
 let illustrationIdCache: string[] | null = null;
 let iconAliasesCache: Record<string, string[]> | null = null;
 let illustrationAliasesCache: Record<string, string[]> | null = null;
+let styleMacroPropertyValuesCache: Record<string, {values: string[], additionalTypes?: string[]}> | null = null;
 
 function readBundledJson(filename: string): any | null {
   try {
@@ -45,3 +46,12 @@ export async function loadIllustrationAliases(): Promise<Record<string, string[]
   const bundled = readBundledJson('illustrationAliases.json');
   return (illustrationAliasesCache = (bundled && typeof bundled === 'object') ? bundled : {});
 }
+
+export function loadStyleMacroPropertyValues(): Record<string, {values: string[], additionalTypes?: string[]}> {
+  if (styleMacroPropertyValuesCache) {return styleMacroPropertyValuesCache;}
+  const bundled = readBundledJson('styleMacroPropertyValues.json');
+  if (!bundled || typeof bundled !== 'object' || Array.isArray(bundled)) {
+    return (styleMacroPropertyValuesCache = {});
+  }
+  return (styleMacroPropertyValuesCache = bundled as any);
+}