diff --git a/README.md b/README.md
index ef67fbc..c602da4 100644
--- a/README.md
+++ b/README.md
@@ -1,16 +1,43 @@
-# Spark Spells GitHub Action
+# Spell Caster
 
-Execute a spell on a persisted, forked network with a shareable link.
+Execute a [Spark spell](https://github.com/marsfoundation/spark-spells) on a forked network with a shareable links.
 
-## Running
+Spell Caster can be run as CLI (for local testing) or configured as GitHub Action.
+
+## Running as CLI
 
 ```bash
 bun install # only first time
-bun src/index.ts SparkEthereum_20240627
+# fill out .env based on .env.example
+
+#bun src/index.ts --root <spark-spells-root-path> <spell-name>
+bun src/index.ts --root ../spark-spell SparkEthereum_20240627
+```
+
+## Running as Github Action
+
+Presents results as GitHub PR comment.
+
+```yml
+      - name: Spell Caster
+        uses: marsfoundation/spell-caster@action
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          TENDERLY_API_KEY: ${{ secrets.TENDERLY_ACCESS_KEY }}
+          TENDERLY_PROJECT: ${{ secrets.TENDERLY_PROJECT }}
+          TENDERLY_ACCOUNT: ${{ secrets.TENDERLY_USER }}
 ```
 
 ## Developing
 
 ```sh
 bun fix # to run linter, tests and typecheck
-```
\ No newline at end of file
+```
+
+### Bun support
+
+GitHub Runners don't support bun as runner environment so we use bun for testing and bundling but not as runtime dependency.
+
+### GH Action
+
+New release of github action (pushed to `action`) branch is done after each commit to `main` branch.
\ No newline at end of file
diff --git a/src/bin/action.ts b/src/bin/action.ts
index 030529d..a735e02 100644
--- a/src/bin/action.ts
+++ b/src/bin/action.ts
@@ -10,7 +10,7 @@ import { getRequiredGithubInput } from '../config/environments/action'
 import { findPendingSpells } from '../spells/findPendingSpells'
 
 async function main(): Promise<void> {
-  const config = getConfig(getRequiredGithubInput)
+  const config = getConfig(getRequiredGithubInput, process.cwd())
 
   const allPendingSpellNames = findPendingSpells(process.cwd())
   core.info(`Pending spells: ${allPendingSpellNames.join(', ')}`)
diff --git a/src/bin/cli.ts b/src/bin/cli.ts
index b6f6439..1bb2f6d 100644
--- a/src/bin/cli.ts
+++ b/src/bin/cli.ts
@@ -1,12 +1,27 @@
 import assert from 'node:assert'
+import { parseArgs } from 'node:util'
 import { forkAndExecuteSpell } from '..'
 import { getConfig } from '../config'
 import { getRequiredShellEnv } from '../config/environments/cli'
+import { ensureAbsolutePath } from '../utils/fs'
+
+async function main() {
+  const args = parseArgs({
+    options: {
+      root: {
+        type: 'string',
+      },
+    },
+    allowPositionals: true,
+    strict: true,
+  })
+  const rootPath = args.values.root
+  const spellName = args.positionals[0]
 
-async function main(spellName?: string) {
   assert(spellName, 'Pass spell name as an argument ex. SparkEthereum_20240627')
+  assert(rootPath, 'Pass root path as an argument ex. --root /path/to/spark-spells')
 
-  const config = getConfig(getRequiredShellEnv)
+  const config = getConfig(getRequiredShellEnv, ensureAbsolutePath(rootPath))
 
   console.log(`Executing spell ${spellName}`)
   const { forkRpc, appUrl } = await forkAndExecuteSpell(spellName, config)
@@ -15,5 +30,4 @@ async function main(spellName?: string) {
   console.log(`Spark App URL: ${appUrl}`)
 }
 
-const arg1 = process.argv[2]
-await main(arg1)
+await main()
diff --git a/src/config/index.ts b/src/config/index.ts
index fe3a225..33ffd0d 100644
--- a/src/config/index.ts
+++ b/src/config/index.ts
@@ -5,6 +5,7 @@ export interface Config {
   tenderly: TenderlyConfig
   networks: Record<string, NetworkConfig>
   deployer: Address
+  spellsRepoPath: string
 }
 
 export interface NetworkConfig {
@@ -19,7 +20,7 @@ export interface TenderlyConfig {
   apiKey: string
 }
 
-export function getConfig(getEnvVariable: (key: string) => string): Config {
+export function getConfig(getEnvVariable: (key: string) => string, spellsRepoPath: string): Config {
   return {
     tenderly: {
       account: getEnvVariable('TENDERLY_ACCOUNT'),
@@ -39,5 +40,6 @@ export function getConfig(getEnvVariable: (key: string) => string): Config {
       },
     },
     deployer: zeroAddress,
+    spellsRepoPath,
   }
 }
diff --git a/src/index.ts b/src/index.ts
index d984ca1..a851d71 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -30,7 +30,12 @@ export async function forkAndExecuteSpell(spellName: string, config: Config): Pr
   })
   const ethereumClient = new EthereumClient(rpc.adminRpcUrl, forkChainId, config.deployer)
 
-  const spellAddress = await deployContract(spellName, rpc.adminRpcUrl, config.deployer)
+  const spellAddress = await deployContract({
+    contractName: spellName,
+    rpc: rpc.adminRpcUrl,
+    from: config.deployer,
+    cwd: config.spellsRepoPath,
+  })
 
   await executeSpell({ spellAddress, network: chain, ethereumClient })
 
diff --git a/src/periphery/forge/index.ts b/src/periphery/forge/index.ts
index 64a9702..2d1c01f 100644
--- a/src/periphery/forge/index.ts
+++ b/src/periphery/forge/index.ts
@@ -1,7 +1,12 @@
 import { $ } from 'dax-sh'
 import { Address } from 'viem'
 
-export async function deployContract(contractName: string, rpc: string, from: Address): Promise<Address> {
-  const result = await $`forge create --rpc-url ${rpc} --from ${from} ${contractName} --unlocked --json`.json()
+export async function deployContract({
+  contractName,
+  rpc,
+  from,
+  cwd,
+}: { contractName: string; rpc: string; from: Address; cwd: string }): Promise<Address> {
+  const result = await $`forge create --rpc-url ${rpc} --from ${from} ${contractName} --unlocked --json`.cwd(cwd).json()
   return result.deployedTo
 }
diff --git a/src/utils/fs.ts b/src/utils/fs.ts
new file mode 100644
index 0000000..0d66567
--- /dev/null
+++ b/src/utils/fs.ts
@@ -0,0 +1,5 @@
+import * as path from 'node:path'
+
+export function ensureAbsolutePath(p: string): string {
+  return path.resolve(p)
+}