diff --git a/src/cli.mjs b/src/cli.mjs
index 745966d7..2248e91e 100755
--- a/src/cli.mjs
+++ b/src/cli.mjs
@@ -5,8 +5,10 @@ import docs from '../util/docs/index.mjs'
 import validate from '../util/validate/index.mjs'
 import openrpc from '../util/openrpc/index.mjs'
 import declarations from '../util/declarations/index.mjs'
+import specification from '../util/specification/index.mjs'
 import nopt from 'nopt'
 import path from 'path'
+import { sign } from 'crypto'
 
 const knownOpts = {
   'task': [String, null],
@@ -15,7 +17,9 @@ const knownOpts = {
   'output': [path],
   'shared-schemas': [path],
   'as-path': Boolean,
-  'static-modules': String
+  'static-modules': String,
+  'base': [path],
+  'sdk': [String, Array]
 }
 const shortHands = {
   't': '--task',
@@ -25,8 +29,11 @@ const shortHands = {
   'o': '--output',
   'ap': '--as-path',
   'sm': '--static-modules',
-  'ss': '--shared-schemas'
+  'ss': '--shared-schemas',
+  'b': '--base',
+  'k': '--sdk'
 }
+
 // Last 2 arguments are the defaults.
 const parsedArgs = nopt(knownOpts, shortHands, process.argv, 2)
 const signOff = () => console.log('\nThis has been a presentation of \x1b[38;5;202mFirebolt\x1b[0m \u{1F525} \u{1F529}\n')
@@ -34,19 +41,23 @@ const signOff = () => console.log('\nThis has been a presentation of \x1b[38;5;2
 const util = parsedArgs.task
 
 if (util === 'sdk') {
-    sdk(parsedArgs).done(signOff)
+  sdk(parsedArgs).done(signOff)
 }
 else if (util === 'docs') {
-    docs(parsedArgs).done(signOff)
+  docs(parsedArgs).done(signOff)
 }
 else if (util === 'validate') {
-    validate(parsedArgs).done(signOff)
+  validate(parsedArgs).done(signOff)
 }
 else if (util === 'openrpc') {
-    openrpc(parsedArgs).done(signOff)
+  openrpc(parsedArgs).done(signOff)
 }
 else if (util === 'declarations') {
-    declarations(parsedArgs).done(signOff)
-} else {
+  declarations(parsedArgs).done(signOff)
+}
+else if (util === 'specification') {
+  specification(parsedArgs).done(signOff) 
+}
+else {
   console.log("Invalid build type")
 }
\ No newline at end of file
diff --git a/util/specification/index.mjs b/util/specification/index.mjs
new file mode 100644
index 00000000..b349ef5f
--- /dev/null
+++ b/util/specification/index.mjs
@@ -0,0 +1,155 @@
+import fs from 'fs'
+
+const run = ({
+    base: base,
+    sdk: sdk,
+    output: output
+  }) => {
+  
+    console.log(base)
+    console.log(sdk)
+    console.log(output)
+
+//    const base = base //JSON.parse(fs.readFileSync('src/json/firebolt-specification-base.json'))
+
+    const sdk_names = {
+        'core': 'node_modules/@firebolt-js/sdk/dist/firebolt-open-rpc.json',
+        'manage': 'node_modules/@firebolt-js/manage/dist/firebolt-open-rpc.json',
+        'discovery': 'node_modules/@firebolt-js/discovery/dist/firebolt-open-rpc.json'
+    }
+
+    const sdks = {
+        methods: []
+    }
+
+    Object.keys(sdk_names).map(name => {
+        const sdk = JSON.parse(fs.readFileSync(sdk_names[name]))
+
+        // make sure there are no duplicate methods across SDKs
+        sdk.methods.forEach(item => {
+            if (!item.name.startsWith('rpc.')) {
+                if (sdks.methods.find(existingItem => existingItem.name === item.name)) {
+                    throw new Error(`Error: '${name}' SDK has a duplicate method '${item.name}.`)
+                }
+            }
+        })
+
+        sdks.methods.push(...sdk.methods.filter(m => !m.name.startsWith('rpc.')))
+    })
+
+    base = JSON.parse(fs.readFileSync(base))
+
+    const getTag = (method, tag) => method.tags ? method.tags.find(t => t.name == tag) || {} : {}
+    const getCapabilities = (method, role) => getTag(method, 'capabilities') ? getTag(method, 'capabilities')['x-' + role] || [] : []
+    const hasAnyCapabilities = method => hasCapabilities(method, 'uses') || hasCapabilities(method, 'provides') || hasCapabilities(method, 'manages')
+    const hasCapabilities = (method, role) => getCapabilities(method, role).length > 0
+    const hasNoCapabilities = method => !hasAnyCapabilities(method)
+    const isValidCapability = capability => base.capabilities.find(c => c.id === capability)
+    const getInvalidCapabilities = method => getCapabilities(method, 'uses').filter(c => !isValidCapability(c)).concat(getCapabilities(method, 'provides').filter(c => !isValidCapability(c))).concat(getCapabilities(method, 'manages').filter(c => !isValidCapability(c)))
+    const hasInvalidCapabilities = method => (getInvalidCapabilities(method).length > 0)
+    const isPrivateCapability = (capability, role) => !(base.capabilities.find(c => c.id === capability) || {use: { public: true}, manage: { public: true }, provide: { public: true }})[role].public
+    const getPrivateCapabilities = (method) => getCapabilities(method, 'uses').filter(c => isPrivateCapability(c, 'use')).concat(getCapabilities(method, 'provides').filter(c => isPrivateCapability(c, 'provide'))).concat(getCapabilities(method, 'manages').filter(c => isPrivateCapability(c, 'manage')))
+    const hasPrivateCapabilities = (method) => (getPrivateCapabilities(method).length > 0)
+
+    let problems
+    let errorCount = 0
+    let warningCount = 0
+
+    problems = sdks.methods.filter(hasNoCapabilities)
+    warningCount += problems.length
+    if (problems.length)
+    console.warn('\nThe following methods have no capabilities tag: \n\t- ' + problems.map(m => m.name).join('\n\t- '))
+
+    problems = sdks.methods.filter(hasInvalidCapabilities)
+    errorCount += problems.length
+    if (problems.length)
+    console.error('\nThe following methods have invalid capabilities: \n\t- ' + problems.map(m => m.name + `: ${getInvalidCapabilities(m).join(', ')}`).join('\n\t- '))
+
+    problems = sdks.methods.filter(hasPrivateCapabilities)
+    errorCount += problems.length
+    if (problems.length)
+    console.error('\nThe following methods have private capabilities: \n\t- ' + problems.map(m => m.name + `: ${getPrivateCapabilities(m).join(', ')}`).join('\n\t- '))
+
+    if (errorCount > 0) {
+        console.warn(`\nFound ${errorCount} problems`)
+    }
+    else {
+        const specification = JSON.parse(JSON.stringify(base))
+        specification.apis = specification.apis || []
+        specification.apis.push(...sdks.methods.filter(hasAnyCapabilities).map( method => {
+            const methodInfo = {
+            "method": method.name,
+            "type": "firebolt"
+            }
+
+            if (hasCapabilities(method, 'uses')) {
+            methodInfo.uses = getCapabilities(method, 'uses')
+            }
+
+            if (hasCapabilities(method, 'provides')) {
+            methodInfo.provides = getCapabilities(method, 'provides')
+            }
+
+            if (hasCapabilities(method, 'manages')) {
+            methodInfo.manages = getCapabilities(method, 'manages')
+            }
+
+            return methodInfo
+        }))
+
+        const orderedCompare = (a, b, order) => order.indexOf(a) - order.indexOf(b)
+        const typeCompare = (a ,b) => {
+            if (a.isExtension && b.isExtension)
+                return 0
+            else if (a.isExtension)
+                return 1
+            else if (b.isExtension)
+                return -1
+            else
+                return 0
+        }
+        
+        const levelCompare = (a ,b) => {
+            const result = orderedCompare(a.level, b.level, ['must', 'should', 'could'])
+            if (result === 0) {
+                return a.id.localeCompare(b.id)
+            }
+            else {
+                return result
+            }
+        }
+        const capabilityCompare = (a, b) => {
+            const result = typeCompare(a, b)
+            
+            if (result === 0) {
+                return levelCompare(a, b)
+            }
+            else {
+                return result
+            }
+        }
+
+        const methodCompare = (a, b) => {
+            const result = orderedCompare(a.type, b.type, ['firebolt', 'w3c', 'extension'])
+
+            if (result === 0)
+                return a.method.localeCompare(b.method)
+            else
+                return result
+        }
+
+        specification.capabilities.sort( capabilityCompare )
+        specification.apis.sort( methodCompare )
+
+        fs.writeFileSync(output, JSON.stringify(specification, null, '\t'))
+        console.log('\nWrote Firebolt Specification:\n' + output)
+    }
+
+    console.log('\n')
+
+    return {
+        done: callback => callback()
+    }
+}
+
+export default run
\ No newline at end of file