diff --git a/examples/critic.py b/examples/critic.py
new file mode 100644
index 0000000..145d444
--- /dev/null
+++ b/examples/critic.py
@@ -0,0 +1,39 @@
+import asyncio
+
+from narada import Narada, CriticConfig
+from pydantic import BaseModel, Field
+
+
+class SearchCriticOutput(BaseModel):
+    search_query_used: str = Field(description="The exact search query the agent used")
+    result_count: int = Field(description="The number of results the agent found")
+
+
+async def main() -> None:
+    # Initialize the Narada client.
+    async with Narada() as narada:
+        window = await narada.open_and_initialize_browser_window()
+
+        # Define a critic that verifies the agent completed the task and extracts
+        # additional structured information from the agent's actions.
+        critic = CriticConfig(
+            prompt=(
+                "Verify that the agent successfully searched Google and found results. "
+                "Extract the exact search query the agent used and the number of results found."
+            ),
+            output_schema=SearchCriticOutput,
+        )
+
+        # Run a task with the critic. After the main agent finishes, the critic
+        # evaluates whether the task was completed successfully.
+        response = await window.agent(
+            prompt='Search Google for "Narada AI" and tell me how many results were found.',
+            critic=critic,
+        )
+
+        print("Agent response:", response.text)
+        print("Critic result:", response.critic_result.validation_passed)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/packages/narada-core/src/narada_core/actions/critic.py b/packages/narada-core/src/narada_core/actions/critic.py
new file mode 100644
index 0000000..5a21fff
--- /dev/null
+++ b/packages/narada-core/src/narada_core/actions/critic.py
@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+from typing import Any, Awaitable, Callable
+
+from narada_core.models import Agent, CriticConfig
+from pydantic import BaseModel, create_model
+
+from narada_core.actions.models import AgentUsage, CriticResult, parse_action_trace
+
+_VALIDATION_VAR = "narada_validation_passed"
+
+
+async def run_critic(
+    *,
+    dispatch_request: Callable[..., Awaitable[Any]],
+    original_prompt: str,
+    response_content: dict[str, Any],
+    action_trace_raw: list[Any] | None,
+    critic: CriticConfig,
+    time_zone: str,
+    timeout: int,
+) -> CriticResult:
+    if critic.output_schema is not None:
+        combined_fields: dict[str, Any] = {
+            name: (info.annotation, info)
+            for name, info in critic.output_schema.model_fields.items()
+        }
+    else:
+        combined_fields = {}
+    combined_fields[_VALIDATION_VAR] = (bool, ...)
+    CriticOutputModel = create_model("CriticOutput", **combined_fields)
+
+    critic_dispatch_response = await dispatch_request(
+        prompt=critic.prompt,
+        agent=Agent.PRODUCTIVITY,
+        output_schema=CriticOutputModel,
+        critic_context={
+            "agentPrompt": original_prompt,
+            "agentOutput": response_content["text"],
+            "actionTrace": action_trace_raw or [],
+            "validationVariableName": _VALIDATION_VAR,
+        },
+        mcp_servers=critic.mcp_servers,
+        time_zone=time_zone,
+        timeout=timeout,
+    )
+
+    critic_content = critic_dispatch_response["response"]
+    if critic_content is None:
+        raise ValueError("Critic dispatch returned no response")
+
+    combined_output = critic_content.get("structuredOutput")
+    validation_passed = (
+        bool(getattr(combined_output, _VALIDATION_VAR, False))
+        if combined_output is not None
+        else False
+    )
+
+    structured_output: BaseModel | None = None
+    if critic.output_schema is not None and combined_output is not None:
+        output_dict = combined_output.model_dump()
+        output_dict.pop(_VALIDATION_VAR, None)
+        structured_output = critic.output_schema.model_validate(output_dict)
+
+    critic_action_trace_raw = critic_content.get("actionTrace")
+    critic_action_trace = (
+        parse_action_trace(critic_action_trace_raw)
+        if critic_action_trace_raw is not None
+        else None
+    )
+
+    return CriticResult(
+        validation_passed=validation_passed,
+        text=critic_content["text"],
+        structured_output=structured_output,
+        usage=AgentUsage.model_validate(critic_dispatch_response["usage"]),
+        action_trace=critic_action_trace,
+    )
diff --git a/packages/narada-core/src/narada_core/actions/models.py b/packages/narada-core/src/narada_core/actions/models.py
index 0c456ef..7ff7aaf 100644
--- a/packages/narada-core/src/narada_core/actions/models.py
+++ b/packages/narada-core/src/narada_core/actions/models.py
@@ -12,7 +12,12 @@
     override,
 )
 
-from pydantic import BaseModel, Field, TypeAdapter, ValidationError
+from pydantic import (
+    BaseModel,
+    Field,
+    TypeAdapter,
+    ValidationError,
+)
 
 # There is no `AgentRequest` because the `agent` action delegates to the `dispatch_request` method
 # under the hood.
@@ -275,6 +280,22 @@ class StructuredOutput(BaseModel, Generic[_StructuredOutputT]):
     content: _StructuredOutputT
 
 
+class CriticResult(BaseModel):
+    """Result from a critic agent that evaluated the main agent's output."""
+
+    validation_passed: bool
+    """Whether the critic determined the main agent successfully completed its task."""
+
+    text: str
+    """The critic's evaluation text."""
+
+    structured_output: Any
+    """Parsed instance of the output_schema passed in CriticConfig, or None if no schema was given."""
+
+    usage: AgentUsage
+    action_trace: ActionTrace | None = None
+
+
 class AgentResponse(BaseModel, Generic[_StructuredOutputT]):
     request_id: str
     status: Literal["success", "error", "input-required"]
@@ -286,6 +307,8 @@ class AgentResponse(BaseModel, Generic[_StructuredOutputT]):
     ]
     usage: AgentUsage
     action_trace: ActionTrace | None = None
+    critic_result: CriticResult | None = None
+    """Result from the critic agent, populated when a CriticConfig is passed to agent()."""
 
 
 class AgenticSelectorClickAction(TypedDict):
diff --git a/packages/narada-core/src/narada_core/models.py b/packages/narada-core/src/narada_core/models.py
index 8e03292..007d56b 100644
--- a/packages/narada-core/src/narada_core/models.py
+++ b/packages/narada-core/src/narada_core/models.py
@@ -3,7 +3,7 @@
 from enum import Enum, StrEnum
 from typing import Annotated, Generic, Literal, NotRequired, TypedDict, TypeVar
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, ConfigDict, Field
 
 
 class Agent(Enum):
@@ -65,6 +65,31 @@ class McpServer(BaseModel):
     selectedTools: list[str] | None = None
 
 
+class CriticConfig(BaseModel):
+    """Configuration for a critic agent that evaluates a main agent's output.
+
+    When passed to `agent()`, the critic runs after the main agent completes and
+    evaluates whether the task was successfully performed, setting a boolean
+    variable to indicate pass or fail.
+    """
+
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+
+    prompt: str = (
+        "Using your context about the actions and outcome of the previous agent, "
+        "determine whether its task was completed successfully."
+    )
+    """Instructions for the critic on how to evaluate the main agent's output."""
+
+    output_schema: type[BaseModel] | None = None
+    """Optional Pydantic model defining additional structured fields for the critic to populate
+    alongside the boolean validation variable. The validation variable should not be included
+    here — it is always added automatically."""
+
+    mcp_servers: list[McpServer] | None = None
+    """Optional MCP servers available to the critic agent."""
+
+
 class RemoteDispatchChatHistoryItem(TypedDict):
     role: Literal["user", "assistant"]
     content: str
diff --git a/packages/narada-pyodide/src/narada/__init__.py b/packages/narada-pyodide/src/narada/__init__.py
index 544d452..1dc01d8 100644
--- a/packages/narada-pyodide/src/narada/__init__.py
+++ b/packages/narada-pyodide/src/narada/__init__.py
@@ -2,7 +2,8 @@
     NaradaError,
     NaradaTimeoutError,
 )
-from narada_core.models import Agent, File, Response, ResponseContent
+from narada_core.actions.models import CriticResult
+from narada_core.models import Agent, CriticConfig, File, Response, ResponseContent
 
 from narada.client import Narada
 from narada.utils import download_file, render_html
@@ -17,6 +18,8 @@
     "__version__",
     "Agent",
     "CloudBrowserWindow",
+    "CriticConfig",
+    "CriticResult",
     "download_file",
     "File",
     "LocalBrowserWindow",
diff --git a/packages/narada-pyodide/src/narada/window.py b/packages/narada-pyodide/src/narada/window.py
index 1e12251..00c46ac 100644
--- a/packages/narada-pyodide/src/narada/window.py
+++ b/packages/narada-pyodide/src/narada/window.py
@@ -20,6 +20,7 @@
 from urllib.parse import urlencode
 
 from js import AbortController, setTimeout  # type: ignore
+from narada_core.actions.critic import run_critic
 from narada_core.actions.models import (
     AgenticMouseAction,
     AgenticMouseActionRequest,
@@ -30,6 +31,7 @@
     AgentResponse,
     AgentUsage,
     CloseWindowRequest,
+    CriticResult,
     ExtensionActionRequest,
     ExtensionActionResponse,
     GetFullHtmlRequest,
@@ -61,6 +63,7 @@
 )
 from narada_core.models import (
     Agent,
+    CriticConfig,
     File,
     McpServer,
     RemoteDispatchChatHistoryItem,
@@ -211,6 +214,7 @@ async def dispatch_request(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: dict[str, Any] | None = None,
+        critic_context: dict[str, Any] | None = None,
         callback_url: str | None = None,
         callback_secret: str | None = None,
         callback_headers: dict[str, Any] | None = None,
@@ -234,6 +238,7 @@ async def dispatch_request(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: dict[str, Any] | None = None,
+        critic_context: dict[str, Any] | None = None,
         callback_url: str | None = None,
         callback_secret: str | None = None,
         callback_headers: dict[str, Any] | None = None,
@@ -256,6 +261,7 @@ async def dispatch_request(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: dict[str, Any] | None = None,
+        critic_context: dict[str, Any] | None = None,
         callback_url: str | None = None,
         callback_secret: str | None = None,
         callback_headers: dict[str, Any] | None = None,
@@ -305,6 +311,8 @@ async def dispatch_request(
             body["secretVariables"] = secret_variables
         if input_variables is not None:
             body["inputVariables"] = input_variables
+        if critic_context is not None:
+            body["criticContext"] = critic_context
         if callback_url is not None:
             body["callbackUrl"] = callback_url
         if callback_secret is not None:
@@ -394,6 +402,7 @@ async def agent(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: dict[str, Any] | None = None,
+        critic: CriticConfig | None = None,
         timeout: int = 1000,
     ) -> AgentResponse[dict[str, Any]]: ...
 
@@ -410,6 +419,7 @@ async def agent(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: dict[str, Any] | None = None,
+        critic: CriticConfig | None = None,
         timeout: int = 1000,
     ) -> AgentResponse[_StructuredOutput]: ...
 
@@ -425,6 +435,7 @@ async def agent(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: dict[str, Any] | None = None,
+        critic: CriticConfig | None = None,
         timeout: int = 1000,
     ) -> AgentResponse:
         """Invokes an agent in the Narada extension side panel chat."""
@@ -450,6 +461,18 @@ async def agent(
             else None
         )
 
+        critic_result: CriticResult | None = None
+        if critic is not None:
+            critic_result = await run_critic(
+                dispatch_request=self.dispatch_request,
+                original_prompt=prompt,
+                response_content=response_content,
+                action_trace_raw=action_trace_raw,
+                critic=critic,
+                time_zone=time_zone,
+                timeout=timeout,
+            )
+
         return AgentResponse(
             request_id=remote_dispatch_response["requestId"],
             status=remote_dispatch_response["status"],
@@ -458,6 +481,7 @@ async def agent(
             structured_output=response_content.get("structuredOutput"),
             usage=AgentUsage.model_validate(remote_dispatch_response["usage"]),
             action_trace=action_trace,
+            critic_result=critic_result,
         )
 
     async def agentic_selector(
diff --git a/packages/narada/src/narada/__init__.py b/packages/narada/src/narada/__init__.py
index 3f6e9fe..452ff2c 100644
--- a/packages/narada/src/narada/__init__.py
+++ b/packages/narada/src/narada/__init__.py
@@ -7,7 +7,8 @@
     NaradaUnsupportedBrowserError,
     UserAbortedError,
 )
-from narada_core.models import Agent, File, Response, ResponseContent
+from narada_core.actions.models import CriticResult
+from narada_core.models import Agent, CriticConfig, File, Response, ResponseContent
 
 from narada.client import Narada
 from narada.config import BrowserConfig, ProxyConfig
@@ -20,6 +21,8 @@
     "Agent",
     "BrowserConfig",
     "CloudBrowserWindow",
+    "CriticConfig",
+    "CriticResult",
     "download_file",
     "File",
     "LocalBrowserWindow",
diff --git a/packages/narada/src/narada/window.py b/packages/narada/src/narada/window.py
index 0a96337..8baadf9 100644
--- a/packages/narada/src/narada/window.py
+++ b/packages/narada/src/narada/window.py
@@ -21,6 +21,7 @@
 )
 
 import aiohttp
+from narada_core.actions.critic import run_critic
 from narada_core.actions.models import (
     AgenticMouseAction,
     AgenticMouseActionRequest,
@@ -31,6 +32,7 @@
     AgentResponse,
     AgentUsage,
     CloseWindowRequest,
+    CriticResult,
     ExtensionActionRequest,
     ExtensionActionResponse,
     GetFullHtmlRequest,
@@ -62,6 +64,7 @@
 )
 from narada_core.models import (
     Agent,
+    CriticConfig,
     File,
     McpServer,
     RemoteDispatchChatHistoryItem,
@@ -251,6 +254,7 @@ async def dispatch_request(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: Mapping[str, Any] | None = None,
+        critic_context: dict[str, Any] | None = None,
         callback_url: str | None = None,
         callback_secret: str | None = None,
         callback_headers: Mapping[str, Any] | None = None,
@@ -275,6 +279,7 @@ async def dispatch_request(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: Mapping[str, Any] | None = None,
+        critic_context: dict[str, Any] | None = None,
         callback_url: str | None = None,
         callback_secret: str | None = None,
         callback_headers: Mapping[str, Any] | None = None,
@@ -298,6 +303,7 @@ async def dispatch_request(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: Mapping[str, Any] | None = None,
+        critic_context: dict[str, Any] | None = None,
         callback_url: str | None = None,
         callback_secret: str | None = None,
         callback_headers: Mapping[str, Any] | None = None,
@@ -346,6 +352,8 @@ async def dispatch_request(
             body["inputVariables"] = await self._normalize_input_variables(
                 input_variables=input_variables
             )
+        if critic_context is not None:
+            body["criticContext"] = critic_context
         if callback_url is not None:
             body["callbackUrl"] = callback_url
         if callback_secret is not None:
@@ -416,6 +424,7 @@ async def agent(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: Mapping[str, Any] | None = None,
+        critic: CriticConfig | None = None,
         timeout: int = 1000,
     ) -> AgentResponse[dict[str, Any]]: ...
 
@@ -433,6 +442,7 @@ async def agent(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: Mapping[str, Any] | None = None,
+        critic: CriticConfig | None = None,
         timeout: int = 1000,
     ) -> AgentResponse[_StructuredOutput]: ...
 
@@ -449,6 +459,7 @@ async def agent(
         mcp_servers: list[McpServer] | None = None,
         secret_variables: dict[str, str] | None = None,
         input_variables: Mapping[str, Any] | None = None,
+        critic: CriticConfig | None = None,
         timeout: int = 1000,
     ) -> AgentResponse:
         """Invokes an agent in the Narada extension side panel chat."""
@@ -475,6 +486,18 @@ async def agent(
             else None
         )
 
+        critic_result: CriticResult | None = None
+        if critic is not None:
+            critic_result = await run_critic(
+                dispatch_request=self.dispatch_request,
+                original_prompt=prompt,
+                response_content=response_content,
+                action_trace_raw=action_trace_raw,
+                critic=critic,
+                time_zone=time_zone,
+                timeout=timeout,
+            )
+
         return AgentResponse(
             request_id=remote_dispatch_response["requestId"],
             status=remote_dispatch_response["status"],
@@ -483,6 +506,7 @@ async def agent(
             structured_output=response_content.get("structuredOutput"),
             usage=AgentUsage.model_validate(remote_dispatch_response["usage"]),
             action_trace=action_trace,
+            critic_result=critic_result,
         )
 
     async def agentic_selector(