diff --git a/src/github/handlers/index.ts b/src/github/handlers/index.ts
index e84843d..165b274 100644
--- a/src/github/handlers/index.ts
+++ b/src/github/handlers/index.ts
@@ -1,7 +1,6 @@
 import { EmitterWebhookEvent } from "@octokit/webhooks";
 import { GitHubEventHandler } from "../github-event-handler";
 import { getConfig } from "../utils/config";
-import { issueCommentCreated } from "./issue-comment/created";
 import { repositoryDispatch } from "./repository-dispatch";
 import { dispatchWorkflow, getDefaultBranch } from "../utils/workflow-dispatch";
 import { DelegatedComputeInputs } from "../types/plugin";
@@ -17,7 +16,6 @@ function tryCatchWrapper(fn: (event: EmitterWebhookEvent) => unknown) {
 }
 
 export function bindHandlers(eventHandler: GitHubEventHandler) {
-  eventHandler.on("issue_comment.created", issueCommentCreated);
   eventHandler.on("repository_dispatch", repositoryDispatch);
   eventHandler.onAny(tryCatchWrapper((event) => handleEvent(event, eventHandler))); // onAny should also receive GithubContext but the types in octokit/webhooks are weird
 }
@@ -46,8 +44,19 @@ async function handleEvent(event: EmitterWebhookEvent, eventHandler: InstanceTyp
 
   for (const pluginChain of pluginChains) {
     if (pluginChain.skipBotEvents && "sender" in event.payload && event.payload.sender?.type === "Bot") {
+      console.log("Skipping plugin chain because sender is a bot");
       continue;
     }
+    if (
+      context.key === "issue_comment.created" &&
+      pluginChain.command &&
+      "comment" in context.payload &&
+      !context.payload.comment.body.startsWith(pluginChain.command)
+    ) {
+      console.log("Skipping plugin chain because command does not match");
+      continue;
+    }
+
     // invoke the first plugin in the chain
     const { plugin, with: settings } = pluginChain.uses[0];
     console.log(`Calling handler for event ${event.name}`);
diff --git a/src/github/handlers/issue-comment/created.ts b/src/github/handlers/issue-comment/created.ts
deleted file mode 100644
index 5109e72..0000000
--- a/src/github/handlers/issue-comment/created.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { GitHubContext } from "../../github-context";
-
-export async function issueCommentCreated(event: GitHubContext<"issue_comment.created">) {
-  if (event.payload.comment.user.type === "Bot") {
-    console.log("Skipping bot comment");
-    return null;
-  }
-
-  await event.octokit.issues.createComment({
-    owner: event.payload.repository.owner.login,
-    repo: event.payload.repository.name,
-    issue_number: event.payload.issue.number,
-    body: "Hello from the worker!",
-  });
-}
diff --git a/src/github/handlers/repository-dispatch.ts b/src/github/handlers/repository-dispatch.ts
index 6ca1f3b..31c472a 100644
--- a/src/github/handlers/repository-dispatch.ts
+++ b/src/github/handlers/repository-dispatch.ts
@@ -2,7 +2,6 @@ import { GitHubContext } from "../github-context";
 import { dispatchWorkflow, getDefaultBranch } from "../utils/workflow-dispatch";
 import { Value } from "@sinclair/typebox/value";
 import { DelegatedComputeInputs, PluginChainState, expressionRegex, pluginOutputSchema } from "../types/plugin";
-import { PluginChain } from "../types/config";
 
 export async function repositoryDispatch(context: GitHubContext<"repository_dispatch">) {
   console.log("Repository dispatch event received", context.payload.client_payload);
@@ -52,7 +51,7 @@ export async function repositoryDispatch(context: GitHubContext<"repository_disp
   const defaultBranch = await getDefaultBranch(context, nextPlugin.plugin.owner, nextPlugin.plugin.repo);
   const token = await context.eventHandler.getToken(state.eventPayload.installation.id);
   const ref = nextPlugin.plugin.ref ?? defaultBranch;
-  const settings = findAndReplaceExpressions(nextPlugin, state);
+  const settings = findAndReplaceExpressions(nextPlugin.with, state);
   const inputs = new DelegatedComputeInputs(pluginOutput.state_id, state.eventName, state.eventPayload, settings, token, ref);
 
   state.currentPlugin++;
@@ -68,16 +67,14 @@ export async function repositoryDispatch(context: GitHubContext<"repository_disp
   });
 }
 
-function findAndReplaceExpressions(plugin: PluginChain[0], state: PluginChainState): Record<string, unknown> {
-  const settings: Record<string, unknown> = {};
-
-  for (const key in plugin.with) {
-    const value = plugin.with[key];
+function findAndReplaceExpressions(settings: object, state: PluginChainState): Record<string, unknown> {
+  const newSettings: Record<string, unknown> = {};
 
+  for (const [key, value] of Object.entries(settings)) {
     if (typeof value === "string") {
       const matches = value.match(expressionRegex);
       if (!matches) {
-        settings[key] = value;
+        newSettings[key] = value;
         continue;
       }
       const parts = matches[1].split(".");
@@ -88,16 +85,18 @@ function findAndReplaceExpressions(plugin: PluginChain[0], state: PluginChainSta
 
       if (parts[1] === "output") {
         const outputProperty = parts[2];
-        settings[key] = getPluginOutputValue(state, pluginId, outputProperty);
+        newSettings[key] = getPluginOutputValue(state, pluginId, outputProperty);
       } else {
         throw new Error(`Invalid expression: ${value}`);
       }
+    } else if (typeof value === "object" && value !== null) {
+      newSettings[key] = findAndReplaceExpressions(value, state);
     } else {
-      settings[key] = value;
+      newSettings[key] = value;
     }
   }
 
-  return settings;
+  return newSettings;
 }
 
 function getPluginOutputValue(state: PluginChainState, pluginId: string, outputKey: string): unknown {