diff --git a/src/data/conversation.ts b/src/data/conversation.ts
index c63e6ba430..c76f6a2ecf 100644
--- a/src/data/conversation.ts
+++ b/src/data/conversation.ts
@@ -1,3 +1,4 @@
+import { ensureArray } from "../common/array/ensure-array";
 import { HomeAssistant } from "../types";
 
 interface IntentTarget {
@@ -58,6 +59,24 @@ export interface Agent {
   supported_languages: "*" | string[];
 }
 
+export interface AssitDebugResult {
+  intent: {
+    name: string;
+  };
+  entities: Record<
+    string,
+    {
+      name: string;
+      value: string;
+      text: string;
+    }
+  >;
+}
+
+export interface AssistDebugResponse {
+  results: (AssitDebugResult | null)[];
+}
+
 export const processConversationInput = (
   hass: HomeAssistant,
   text: string,
@@ -91,3 +110,16 @@ export const prepareConversation = (
     type: "conversation/prepare",
     language,
   });
+
+export const debugAgent = (
+  hass: HomeAssistant,
+  sentences: string[] | string,
+  language: string,
+  device_id?: string
+): Promise<AssistDebugResponse> =>
+  hass.callWS({
+    type: "conversation/agent/homeassistant/debug",
+    sentences: ensureArray(sentences),
+    language,
+    device_id,
+  });
diff --git a/src/panels/developer-tools/assist/developer-tools-assist.ts b/src/panels/developer-tools/assist/developer-tools-assist.ts
new file mode 100644
index 0000000000..89e3890f5c
--- /dev/null
+++ b/src/panels/developer-tools/assist/developer-tools-assist.ts
@@ -0,0 +1,240 @@
+import { dump } from "js-yaml";
+import { CSSResultGroup, LitElement, css, html, nothing } from "lit";
+import { customElement, property, query, state } from "lit/decorators";
+import "../../../components/ha-button";
+import "../../../components/ha-code-editor";
+import "../../../components/ha-language-picker";
+import "../../../components/ha-textarea";
+import "../../../components/ha-absolute-time";
+import type { HaTextArea } from "../../../components/ha-textarea";
+import {
+  AssitDebugResult,
+  debugAgent,
+  listAgents,
+} from "../../../data/conversation";
+import { SubscribeMixin } from "../../../mixins/subscribe-mixin";
+import { haStyle } from "../../../resources/styles";
+import { HomeAssistant } from "../../../types";
+import { formatLanguageCode } from "../../../common/language/format_language";
+import { storage } from "../../../common/decorators/storage";
+
+type SentenceParsingResult = {
+  sentence: string;
+  language: string;
+  result: AssitDebugResult | null;
+  time: Date;
+};
+
+@customElement("developer-tools-assist")
+class HaPanelDevAssist extends SubscribeMixin(LitElement) {
+  @property({ attribute: false }) public hass!: HomeAssistant;
+
+  @property({ type: Boolean }) public narrow!: boolean;
+
+  @state() supportedLanguages?: string[];
+
+  @storage({
+    key: "assist_debug_language",
+    state: true,
+    subscribe: false,
+    storage: "localStorage",
+  })
+  _language?: string;
+
+  @state() _results: SentenceParsingResult[] = [];
+
+  @query("#sentences-input") _sentencesInput!: HaTextArea;
+
+  @state() _validInput = false;
+
+  private _languageChanged(ev) {
+    this._language = ev.detail.value;
+  }
+
+  private _textAreaInput(ev) {
+    const value = ev.target.value;
+    const valid = Boolean(value);
+    if (valid !== this._validInput) {
+      this._validInput = valid;
+    }
+  }
+
+  private async _parse() {
+    const sentences = this._sentencesInput.value
+      .split("\n")
+      .filter((a) => a !== "");
+    const { results } = await debugAgent(this.hass, sentences, this._language!);
+
+    this._sentencesInput.value = "";
+
+    const now = new Date();
+
+    const newResults: SentenceParsingResult[] = [];
+    sentences.forEach((sentence, index) => {
+      const result = results[index];
+
+      newResults.push({
+        sentence,
+        language: this._language!,
+        result,
+        time: now,
+      });
+    });
+    this._results = [...newResults, ...this._results];
+  }
+
+  private async _fetchLanguages() {
+    const { agents } = await listAgents(this.hass);
+    const assistAgent = agents.find((agent) => agent.id === "homeassistant");
+    this.supportedLanguages =
+      assistAgent?.supported_languages === "*"
+        ? undefined
+        : assistAgent?.supported_languages;
+  }
+
+  protected firstUpdated(): void {
+    this._fetchLanguages();
+  }
+
+  protected render() {
+    return html`
+      <div class="content">
+        <ha-card header="Sentences parser" class="form">
+          <div class="card-content">
+            <p class="description">
+              Enter sentences and see how they will be parsed by Home Assistant.
+              Each line will be processed as individual sentence. Intents will
+              not be executed on your instance.
+            </p>
+            ${this.supportedLanguages
+              ? html`
+                  <ha-language-picker
+                    .languages=${this.supportedLanguages}
+                    .hass=${this.hass}
+                    .value=${this._language ?? "en"}
+                    @value-changed=${this._languageChanged}
+                  ></ha-language-picker>
+                `
+              : nothing}
+            <ha-textarea
+              autogrow
+              label="Sentences"
+              id="sentences-input"
+              @input=${this._textAreaInput}
+            ></ha-textarea>
+          </div>
+          <div class="card-actions">
+            <ha-button
+              @click=${this._parse}
+              .disabled=${!this._language || !this._validInput}
+            >
+              Parse sentences
+            </ha-button>
+          </div>
+        </ha-card>
+
+        ${this._results.map((r) => {
+          const { sentence, result, language, time } = r;
+          const matched = result != null;
+
+          return html`
+            <ha-card class="result">
+              <div class="card-content">
+                <div class="sentence">
+                  <p>${sentence}</p>
+                  <p>${matched ? "✅" : "❌"}</p>
+                </div>
+                <div class="info">
+                    <p>
+                      Language: ${formatLanguageCode(
+                        language,
+                        this.hass.locale
+                      )} (${language})
+                    </p>
+                    <p>Execution time: 
+                      <ha-absolute-time .hass=${this.hass} .datetime=${time}>
+                    </ha-absolute-time>
+                  </p>
+                    
+                  </p>
+                </div>
+                ${
+                  result
+                    ? html`
+                        <ha-code-editor
+                          mode="yaml"
+                          .hass=${this.hass}
+                          .value=${dump(result).trimRight()}
+                          read-only
+                          dir="ltr"
+                        ></ha-code-editor>
+                      `
+                    : html`<ha-alert alert-type="error"
+                        >No intent matched</ha-alert
+                      >`
+                }
+              </div>
+            </ha-card>
+          `;
+        })}
+      </div>
+    `;
+  }
+
+  static get styles(): CSSResultGroup {
+    return [
+      haStyle,
+      css`
+        .content {
+          padding: 28px 20px 16px;
+          padding: max(28px, calc(12px + env(safe-area-inset-top)))
+            max(20px, calc(4px + env(safe-area-inset-right)))
+            max(16px, env(safe-area-inset-bottom))
+            max(20px, calc(4px + env(safe-area-inset-left)));
+          max-width: 1040px;
+          margin: 0 auto;
+        }
+        .description {
+          margin: 0;
+          margin-bottom: 16px;
+        }
+        ha-textarea {
+          width: 100%;
+        }
+        .card-actions {
+          text-align: right;
+        }
+        .form {
+          margin-bottom: 16px;
+        }
+        .result {
+          margin-bottom: 16px;
+        }
+        .sentence {
+          font-weight: 500;
+          margin-bottom: 8px;
+          display: flex;
+          flex-direction: row;
+          justify-content: space-between;
+        }
+        .sentence p {
+          margin: 0;
+        }
+        .info p {
+          margin: 0;
+        }
+        ha-code-editor,
+        ha-alert {
+          display: block;
+          margin-top: 16px;
+        }
+      `,
+    ];
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "developer-tools-assist": HaPanelDevAssist;
+  }
+}
diff --git a/src/panels/developer-tools/developer-tools-router.ts b/src/panels/developer-tools/developer-tools-router.ts
index b614f5e817..5b8baf3899 100644
--- a/src/panels/developer-tools/developer-tools-router.ts
+++ b/src/panels/developer-tools/developer-tools-router.ts
@@ -45,6 +45,10 @@ class DeveloperToolsRouter extends HassRouterPage {
         tag: "developer-yaml-config",
         load: () => import("./yaml_configuration/developer-yaml-config"),
       },
+      assist: {
+        tag: "developer-tools-assist",
+        load: () => import("./assist/developer-tools-assist"),
+      },
     },
   };
 
diff --git a/src/panels/developer-tools/ha-panel-developer-tools.ts b/src/panels/developer-tools/ha-panel-developer-tools.ts
index 54c5666e9f..813cc014e7 100644
--- a/src/panels/developer-tools/ha-panel-developer-tools.ts
+++ b/src/panels/developer-tools/ha-panel-developer-tools.ts
@@ -65,6 +65,7 @@ class PanelDeveloperTools extends LitElement {
               "ui.panel.developer-tools.tabs.statistics.title"
             )}
           </paper-tab>
+          <paper-tab page-name="assist">Assist</paper-tab>
         </paper-tabs>
       </div>
       <developer-tools-router