diff --git a/litellm/proxy/agent_session_endpoints/schemas.py b/litellm/proxy/agent_session_endpoints/schemas.py
new file mode 100644
index 00000000000..31e202e8afd
--- /dev/null
+++ b/litellm/proxy/agent_session_endpoints/schemas.py
@@ -0,0 +1,181 @@
+"""
+Pydantic request/response models for the public agent_session_endpoints API.
+
+These models are the canonical wire shape — Epic D (TS SDK) generates types
+from this file via ``model_json_schema``. Keep field names and types stable
+once shipped.
+"""
+
+from typing import Any, Dict, List, Literal, Optional
+
+from pydantic import BaseModel, Field
+
+
+# ---------------------------------------------------------------------------
+# Repo / env_vars (shared building blocks)
+# ---------------------------------------------------------------------------
+
+
+class RepoSpec(BaseModel):
+    """A git repository to clone into the session VM."""
+
+    url: str
+    startingRef: Optional[str] = Field(
+        default=None,
+        description="Branch, tag, or SHA to check out. Defaults to default branch.",
+    )
+
+    model_config = {"extra": "allow"}
+
+
+# ---------------------------------------------------------------------------
+# Agent
+# ---------------------------------------------------------------------------
+
+
+class AgentCreate(BaseModel):
+    name: str
+    model: str
+    system_prompt: Optional[str] = None
+    default_repos: Optional[List[RepoSpec]] = None
+    default_env_vars: Optional[Dict[str, str]] = None
+    tools_config: Optional[Dict[str, Any]] = None
+    metadata: Optional[Dict[str, Any]] = None
+
+
+class AgentUpdate(BaseModel):
+    """All fields optional — PATCH semantics. ``None`` means "leave alone"."""
+
+    name: Optional[str] = None
+    model: Optional[str] = None
+    system_prompt: Optional[str] = None
+    default_repos: Optional[List[RepoSpec]] = None
+    default_env_vars: Optional[Dict[str, str]] = None
+    tools_config: Optional[Dict[str, Any]] = None
+    metadata: Optional[Dict[str, Any]] = None
+
+
+class AgentResponse(BaseModel):
+    id: str
+    name: str
+    model: str
+    system_prompt: Optional[str] = None
+    default_repos: Optional[List[Dict[str, Any]]] = None
+    default_env_vars: Optional[Dict[str, str]] = None
+    tools_config: Optional[Dict[str, Any]] = None
+    metadata: Optional[Dict[str, Any]] = None
+    team_id: Optional[str] = None
+    created_at: Optional[str] = None
+    updated_at: Optional[str] = None
+
+
+# ---------------------------------------------------------------------------
+# Session
+# ---------------------------------------------------------------------------
+
+
+class SessionCreate(BaseModel):
+    agent_id: str
+    repos: Optional[List[RepoSpec]] = None
+    env_vars: Optional[Dict[str, str]] = None
+    max_session_minutes: Optional[int] = Field(
+        default=None,
+        description="Override default 4h max. Capped at 24h.",
+        ge=1,
+        le=24 * 60,
+    )
+
+
+class SessionResponse(BaseModel):
+    id: str
+    agent_id: str
+    status: str
+    vm_id: Optional[str] = None
+    vm_provider: Optional[str] = None
+    repos: List[Dict[str, Any]] = Field(default_factory=list)
+    expires_at: Optional[str] = None
+    last_heartbeat_at: Optional[str] = None
+    created_at: Optional[str] = None
+    updated_at: Optional[str] = None
+    terminated_at: Optional[str] = None
+    daemon_token: Optional[str] = Field(
+        default=None,
+        description="Returned ONLY on initial create. Subsequent reads return None.",
+    )
+
+
+# ---------------------------------------------------------------------------
+# Run
+# ---------------------------------------------------------------------------
+
+
+class RunCreate(BaseModel):
+    prompt: Dict[str, Any] = Field(
+        ...,
+        description='Free-form prompt object. ``{"text": "hi"}`` is the minimum.',
+    )
+
+
+class RunResponse(BaseModel):
+    id: str
+    session_id: str
+    status: str
+    prompt: Dict[str, Any]
+    parent_run_id: Optional[str] = None
+    result: Optional[str] = None
+    git_branches: Optional[List[Dict[str, Any]]] = None
+    created_at: Optional[str] = None
+    updated_at: Optional[str] = None
+    started_at: Optional[str] = None
+    terminated_at: Optional[str] = None
+
+
+# ---------------------------------------------------------------------------
+# Followup
+# ---------------------------------------------------------------------------
+
+
+class FollowupCreate(BaseModel):
+    prompt: Dict[str, Any]
+
+
+class FollowupResponse(BaseModel):
+    run_id: str
+    action: Literal["queued", "new_run"]
+
+
+# ---------------------------------------------------------------------------
+# Internal endpoints (daemon callbacks)
+# ---------------------------------------------------------------------------
+
+
+class DaemonRegisterRequest(BaseModel):
+    vm_id: Optional[str] = None
+    daemon_version: Optional[str] = None
+
+
+class DaemonHeartbeatRequest(BaseModel):
+    vm_id: Optional[str] = None
+
+
+class EventAppend(BaseModel):
+    event_type: str
+    payload: Dict[str, Any]
+
+
+class NextRunResponse(BaseModel):
+    run_id: str
+    prompt: Dict[str, Any]
+
+
+class ConversationMessage(BaseModel):
+    run_id: str
+    seq: int
+    event_type: str
+    payload: Dict[str, Any]
+    created_at: Optional[str] = None
+
+
+class ConversationResponse(BaseModel):
+    session_id: str
+    messages: List[ConversationMessage]