diff --git a/alfred/agent/agent.py b/alfred/agent/agent.py
index b17dc60..31a4252 100644
--- a/alfred/agent/agent.py
+++ b/alfred/agent/agent.py
@@ -10,6 +10,7 @@ from alfred.settings import settings
 
 from .prompt import PromptBuilder
 from .registry import Tool, make_tools
+from .workflows import WorkflowLoader
 
 logger = logging.getLogger(__name__)
 
@@ -33,8 +34,8 @@ class Agent:
         self.settings = settings
         self.llm = llm
         self.tools: dict[str, Tool] = make_tools(settings)
-        self.prompt_builder = PromptBuilder(self.tools)
-        self.settings = settings
+        self.workflow_loader = WorkflowLoader()
+        self.prompt_builder = PromptBuilder(self.tools, self.workflow_loader)
         self.max_tool_iterations = max_tool_iterations
 
     def step(self, user_input: str) -> str:
@@ -168,6 +169,19 @@ class Agent:
                 "available_tools": available,
             }
 
+        # Defensive: reject calls to tools that are not currently in scope.
+        visible = set(self.prompt_builder.visible_tool_names())
+        if tool_name not in visible:
+            return {
+                "error": "tool_out_of_scope",
+                "message": (
+                    f"Tool '{tool_name}' is not available in the current "
+                    "workflow scope. Call end_workflow first or start the "
+                    "appropriate workflow."
+                ),
+                "available_tools": sorted(visible),
+            }
+
         tool = self.tools[tool_name]
 
         # Execute tool
diff --git a/alfred/agent/prompt.py b/alfred/agent/prompt.py
index 4a1d272..aa93bd4 100644
--- a/alfred/agent/prompt.py
+++ b/alfred/agent/prompt.py
@@ -8,15 +8,56 @@ from alfred.infrastructure.persistence.memory import MemoryRegistry
 
 from .expressions import build_expressions_context
 from .registry import Tool
+from .workflows import WorkflowLoader
+
+# Tools that are always available, regardless of workflow scope.
+# Kept small on purpose — the noyau is what the agent uses to either
+# answer trivially or pivot into a workflow.
+CORE_TOOLS: tuple[str, ...] = (
+    "set_language",
+    "set_path_for_folder",
+    "list_folder",
+    "start_workflow",
+    "end_workflow",
+)
 
 
 class PromptBuilder:
     """Builds system prompts for the agent with memory context."""
 
-    def __init__(self, tools: dict[str, Tool]):
+    def __init__(
+        self,
+        tools: dict[str, Tool],
+        workflow_loader: WorkflowLoader | None = None,
+    ):
         self.tools = tools
+        self.workflow_loader = workflow_loader or WorkflowLoader()
         self._memory_registry = MemoryRegistry()
 
+    def _active_workflow(self, memory) -> dict | None:
+        """Return the YAML definition of the active workflow, or None."""
+        current = memory.stm.workflow.current
+        if current is None:
+            return None
+        return self.workflow_loader.get(current.get("type"))
+
+    def visible_tool_names(self) -> list[str]:
+        """
+        Return the names of the tools currently in scope.
+
+        - Idle (no workflow): core noyau only. The LLM enters a workflow
+          via start_workflow to access more tools.
+        - Workflow active: core noyau + the workflow's declared tools.
+        """
+        memory = get_memory()
+        visible = set(CORE_TOOLS)
+        workflow = self._active_workflow(memory)
+        if workflow is not None:
+            for name in workflow.get("tools", []):
+                visible.add(name)
+        # Only return tools that actually exist in the registry.
+        return [name for name in self.tools if name in visible]
+
     def _format_identity(self, memory) -> str:
         """Build Alfred's identity and personality section."""
         username = memory.stm.get_entity("username")
@@ -58,9 +99,12 @@ EXPRESSIONS À UTILISER (une par situation, naturellement intégrées dans ta r
 {expressions_block}"""
 
     def build_tools_spec(self) -> list[dict[str, Any]]:
-        """Build the tool specification for the LLM API."""
+        """Build the tool specification for the LLM API (scope-filtered)."""
+        visible = set(self.visible_tool_names())
         tool_specs = []
         for tool in self.tools.values():
+            if tool.name not in visible:
+                continue
             spec = {
                 "type": "function",
                 "function": {
@@ -73,15 +117,57 @@ EXPRESSIONS À UTILISER (une par situation, naturellement intégrées dans ta r
         return tool_specs
 
     def _format_tools_description(self) -> str:
-        """Format tools with their descriptions and parameters."""
-        if not self.tools:
+        """Format the currently-visible tools with description + params."""
+        visible = set(self.visible_tool_names())
+        visible_tools = [t for t in self.tools.values() if t.name in visible]
+        if not visible_tools:
             return ""
         return "\n".join(
             f"- {tool.name}: {tool.description}\n"
             f"  Parameters: {json.dumps(tool.parameters, ensure_ascii=False)}"
-            for tool in self.tools.values()
+            for tool in visible_tools
         )
 
+    def _format_workflow_scope(self, memory) -> str:
+        """Describe the current workflow scope so the LLM has a plan."""
+        workflow = self._active_workflow(memory)
+        if workflow is None:
+            available = self.workflow_loader.names()
+            if not available:
+                return ""
+            lines = ["WORKFLOW SCOPE: idle (broad catalog narrowed to core noyau)."]
+            lines.append(
+                "  Call start_workflow(workflow_name, params) to enter a scope."
+            )
+            lines.append("  Available workflows:")
+            for name in available:
+                wf = self.workflow_loader.get(name) or {}
+                desc = (wf.get("description") or "").strip().splitlines()
+                summary = desc[0] if desc else ""
+                lines.append(f"    - {name}: {summary}")
+            return "\n".join(lines)
+
+        current = memory.stm.workflow.current or {}
+        lines = [
+            f"WORKFLOW SCOPE: active — {current.get('type')} "
+            f"(stage: {current.get('stage')})",
+        ]
+        target = current.get("target")
+        if target:
+            lines.append(f"  Params: {target}")
+        wf_desc = (workflow.get("description") or "").strip()
+        if wf_desc:
+            lines.append(f"  Goal: {wf_desc}")
+        steps = workflow.get("steps", [])
+        if steps:
+            lines.append("  Steps:")
+            for step in steps:
+                step_id = step.get("id", "?")
+                step_tool = step.get("tool") or ("ask_user" if step.get("ask_user") else "—")
+                lines.append(f"    - {step_id} ({step_tool})")
+        lines.append("  Call end_workflow(reason) when done, cancelled, or off-topic.")
+        return "\n".join(lines)
+
     def _format_episodic_context(self, memory) -> str:
         """Format episodic memory context for the prompt."""
         lines = []
@@ -213,7 +299,10 @@ EXPRESSIONS À UTILISER (une par situation, naturellement intégrées dans ta r
         # Memory schema
         memory_schema = self._format_memory_schema()
 
-        # Available tools
+        # Workflow scope (active workflow plan or list of options)
+        workflow_section = self._format_workflow_scope(memory)
+
+        # Available tools (already filtered by scope)
         tools_desc = self._format_tools_description()
         tools_section = f"\nOUTILS DISPONIBLES:\n{tools_desc}" if tools_desc else ""
 
@@ -233,6 +322,7 @@ RÈGLES:
             stm_context,
             episodic_context,
             memory_schema,
+            workflow_section,
             tools_section,
             rules,
         ]
diff --git a/alfred/agent/registry.py b/alfred/agent/registry.py
index 2365402..e45480b 100644
--- a/alfred/agent/registry.py
+++ b/alfred/agent/registry.py
@@ -129,6 +129,7 @@ def make_tools(settings) -> dict[str, Tool]:
     from .tools import api as api_tools  # noqa: PLC0415
     from .tools import filesystem as fs_tools  # noqa: PLC0415
     from .tools import language as lang_tools  # noqa: PLC0415
+    from .tools import workflow as wf_tools  # noqa: PLC0415
 
     tool_functions = [
         fs_tools.set_path_for_folder,
@@ -150,6 +151,8 @@ def make_tools(settings) -> dict[str, Tool]:
         api_tools.add_torrent_to_qbittorrent,
         api_tools.get_torrent_by_index,
         lang_tools.set_language,
+        wf_tools.start_workflow,
+        wf_tools.end_workflow,
     ]
 
     specs = load_tool_specs()
diff --git a/alfred/agent/tools/specs/end_workflow.yaml b/alfred/agent/tools/specs/end_workflow.yaml
new file mode 100644
index 0000000..3202091
--- /dev/null
+++ b/alfred/agent/tools/specs/end_workflow.yaml
@@ -0,0 +1,48 @@
+name: end_workflow
+
+summary: >
+  Leave the current workflow scope and return to the broad-catalog mode.
+
+description: |
+  Clears the active workflow from STM. After this call the visible tool
+  catalog returns to the core noyau plus start_workflow, so the agent is
+  ready to handle a different request.
+
+when_to_use: |
+  - When all the workflow's steps have completed successfully.
+  - When the user explicitly cancels the current task.
+  - When the user changes subject mid-conversation and the active
+    workflow is no longer relevant.
+  - When an unrecoverable error makes continuing pointless — explain
+    in 'reason'.
+
+when_not_to_use: |
+  - Do not call when there is no active workflow — it will return an
+    error. Just call start_workflow for the new request instead.
+  - Do not call mid-step just to "free up tools"; finish the step
+    or fail it explicitly first.
+
+next_steps: |
+  - After ending, you can either call start_workflow for a new task or
+    answer the user directly from the broad catalog.
+
+parameters:
+  reason:
+    description: Short reason for ending — completed, cancelled, changed_subject, error, ...
+    why_needed: |
+      Recorded in episodic memory for debugging and future audits. A
+      structured short string is more useful than a long sentence.
+    example: completed
+
+returns:
+  ok:
+    description: Workflow ended; catalog is back to the broad noyau.
+    fields:
+      workflow: Name of the workflow that just ended.
+      reason: The reason that was passed in.
+
+  error:
+    description: Could not end — typically because nothing was active.
+    fields:
+      error: Short error code (no_active_workflow).
+      message: Human-readable explanation.
diff --git a/alfred/agent/tools/specs/start_workflow.yaml b/alfred/agent/tools/specs/start_workflow.yaml
new file mode 100644
index 0000000..59298cc
--- /dev/null
+++ b/alfred/agent/tools/specs/start_workflow.yaml
@@ -0,0 +1,64 @@
+name: start_workflow
+
+summary: >
+  Enter a workflow scope — narrows the visible tool catalog and gives the
+  agent a clear multi-step plan to follow.
+
+description: |
+  Activates a named workflow defined in YAML under agent/workflows/.
+  Once active, only the workflow's declared tools (plus the core noyau)
+  are exposed to the LLM, which keeps the decision space small and
+  focused. The returned plan (description + steps) is the script the
+  agent should execute until end_workflow is called.
+
+when_to_use: |
+  Use as the very first action whenever the user request maps to a
+  known workflow (e.g. "organize Breaking Bad" → media.organize_media).
+  Pass any parameters you already know (release name, target media,
+  flags) in 'params' so later steps can read them from STM.
+
+when_not_to_use: |
+  - Do not start a workflow for purely conversational replies or
+    one-shot lookups that need a single tool call.
+  - Do not start a new workflow while one is already active — call
+    end_workflow first.
+
+next_steps: |
+  - On status=ok: follow the returned 'steps' list, calling the tools
+    in order. The visible tool catalog has already been narrowed.
+  - On status=error (unknown_workflow): surface the available list to
+    the user and ask which one they meant.
+  - On status=error (workflow_already_active): either continue the
+    active workflow or call end_workflow first.
+
+parameters:
+  workflow_name:
+    description: Fully-qualified name of the workflow to start (e.g. media.organize_media).
+    why_needed: |
+      Identifies which YAML definition to load. Names use the
+      'domain.action' convention (media.*, mail.*, ...).
+    example: media.organize_media
+
+  params:
+    description: Initial parameters to seed the workflow with (release name, target, flags).
+    why_needed: |
+      Later steps read these from STM instead of asking the user again.
+      Pass whatever you already extracted from the user's message.
+    example: '{"release_name": "Breaking.Bad.S01.1080p.BluRay.x265-GROUP", "keep_seeding": true}'
+
+returns:
+  ok:
+    description: Workflow activated; catalog has been narrowed.
+    fields:
+      workflow: Name of the activated workflow.
+      description: Human-readable description of what the workflow does.
+      steps: Ordered list of steps to execute.
+      tools: Tools that are now visible (in addition to the core noyau).
+
+  error:
+    description: Could not activate the workflow.
+    fields:
+      error: Short error code (unknown_workflow, workflow_already_active).
+      message: Human-readable explanation.
+      available_workflows: List of valid workflow names (only on unknown_workflow).
+      active_workflow: Name of the currently active workflow (only on workflow_already_active).
diff --git a/alfred/agent/tools/workflow.py b/alfred/agent/tools/workflow.py
new file mode 100644
index 0000000..5910c55
--- /dev/null
+++ b/alfred/agent/tools/workflow.py
@@ -0,0 +1,86 @@
+"""Workflow scoping tools — start_workflow / end_workflow meta-tools.
+
+These tools let the agent enter and leave a workflow scope. While a
+workflow is active, the PromptBuilder narrows the visible tool catalog
+to the noyau + the workflow's declared tools, so the LLM doesn't have
+to reason over the full set.
+"""
+
+import logging
+from typing import Any
+
+from alfred.infrastructure.persistence import get_memory
+
+from ..workflows import WorkflowLoader
+
+logger = logging.getLogger(__name__)
+
+_loader_cache: list[WorkflowLoader] = []
+
+
+def _get_loader() -> WorkflowLoader:
+    """Lazily build the module-level WorkflowLoader."""
+    if not _loader_cache:
+        _loader_cache.append(WorkflowLoader())
+    return _loader_cache[0]
+
+
+def start_workflow(workflow_name: str, params: dict) -> dict[str, Any]:
+    """See specs/start_workflow.yaml for full description."""
+    loader = _get_loader()
+    workflow = loader.get(workflow_name)
+    if workflow is None:
+        return {
+            "status": "error",
+            "error": "unknown_workflow",
+            "message": f"Workflow '{workflow_name}' not found",
+            "available_workflows": loader.names(),
+        }
+
+    memory = get_memory()
+    current = memory.stm.workflow.current
+    if current is not None:
+        return {
+            "status": "error",
+            "error": "workflow_already_active",
+            "message": (
+                f"Workflow '{current.get('type')}' is already active. "
+                "Call end_workflow before starting a new one."
+            ),
+            "active_workflow": current.get("type"),
+        }
+
+    memory.stm.start_workflow(workflow_name, params or {})
+    memory.save()
+    logger.info(f"start_workflow: '{workflow_name}' with params={params}")
+
+    return {
+        "status": "ok",
+        "workflow": workflow_name,
+        "description": workflow.get("description", ""),
+        "steps": workflow.get("steps", []),
+        "tools": workflow.get("tools", []),
+    }
+
+
+def end_workflow(reason: str) -> dict[str, Any]:
+    """See specs/end_workflow.yaml for full description."""
+    memory = get_memory()
+    current = memory.stm.workflow.current
+    if current is None:
+        return {
+            "status": "error",
+            "error": "no_active_workflow",
+            "message": "No workflow is currently active.",
+        }
+
+    workflow_name = current.get("type")
+    memory.stm.end_workflow()
+    memory.save()
+    logger.info(f"end_workflow: '{workflow_name}' reason={reason!r}")
+
+    return {
+        "status": "ok",
+        "workflow": workflow_name,
+        "reason": reason,
+    }
diff --git a/alfred/agent/workflows/media.organize_media.yaml b/alfred/agent/workflows/media.organize_media.yaml
index 27f82f2..2be56b7 100644
--- a/alfred/agent/workflows/media.organize_media.yaml
+++ b/alfred/agent/workflows/media.organize_media.yaml
@@ -14,9 +14,14 @@ trigger:
 
 tools:
   - list_folder
+  - analyze_release
+  - probe_media
   - find_media_imdb_id
-  - resolve_destination
-  - move_media
+  - resolve_season_destination
+  - resolve_episode_destination
+  - resolve_movie_destination
+  - resolve_series_destination
+  - move_to_destination
   - manage_subtitles
   - create_seed_links
 
@@ -34,22 +39,31 @@ steps:
     params:
       folder_type: download
 
+  - id: analyze
+    tool: analyze_release
+    description: >
+      Parse the release name to detect media_type (movie / tv_season /
+      tv_episode / tv_complete) and extract season/episode info.
+
   - id: identify_media
     tool: find_media_imdb_id
-    description: Confirm title, type (series/movie), and metadata via TMDB.
+    description: Confirm canonical title and year via TMDB.
 
   - id: resolve_destination
-    tool: resolve_destination
     description: >
-      Compute the correct destination path in the library.
-      Uses the release name + TMDB metadata to build folder and file names.
-      If multiple series folders exist for this title, returns
-      needs_clarification and the user must pick one (re-call with confirmed_folder).
+      Call the resolver that matches media_type from analyze_release:
+        movie       → resolve_movie_destination
+        tv_season   → resolve_season_destination
+        tv_episode  → resolve_episode_destination
+        tv_complete → resolve_series_destination
+      If the resolver returns needs_clarification, ask the user and
+      re-call with confirmed_folder.
 
   - id: move_file
-    tool: move_media
+    tool: move_to_destination
     description: >
-      Move the video file to library_file returned by resolve_destination.
+      Move the video file/folder to the destination returned by the
+      resolver above.
 
   - id: handle_subtitles
     tool: manage_subtitles
@@ -63,7 +77,7 @@ steps:
       question: "Do you want to keep seeding this torrent?"
       answers:
         "yes": { next_step: create_seed_links }
-        "no":  { next_step: update_library }
+        "no":  { next_step: end }
 
   - id: create_seed_links
     tool: create_seed_links
@@ -72,10 +86,6 @@ steps:
       and copy all remaining files from the original download folder
       (subs, nfo, jpg, …) so the torrent stays complete for seeding.
 
-  - id: update_library
-    memory_write: Library
-    description: Add the entry to the LTM library after a successful move.
-
 naming_convention:
   # Resolved by domain entities (Movie, Episode) — not hardcoded here
   tv_show: "{title}/Season {season:02d}/{title}.S{season:02d}E{episode:02d}.{ext}"