feat(workflows): add --dry-run flag to specify workflow run

src/specify_cli/__init__.py

@@ -39,6 +39,7 @@
 from rich.panel import Panel
 from rich.align import Align
 from rich.table import Table
+from rich.markup import escape as _rich_escape_markup
 from .shared_infra import (
     install_shared_infra as _install_shared_infra_impl,
     refresh_shared_templates as _refresh_shared_templates_impl,
@@ -810,6 +811,18 @@ def workflow_run(
         "--json",
         help="Emit the run outcome as a single JSON object instead of formatted text.",
     ),
+    dry_run: bool = typer.Option(
+        False,
+        "--dry-run",
+        help=(
+            "Preview the workflow without dispatching built-in command, "
+            "prompt, and gate steps. Those steps emit a synthetic preview "
+            "message instead of executing; the run is persisted for "
+            "inspection but cannot be resumed as a real run. Note: other "
+            "step types (e.g. init, shell) are NOT short-circuited and "
+            "may still perform their normal work during dry-run."
+        ),
+    ),
 ):
     """Run a workflow from an installed ID or local YAML path."""
     from .workflows import load_custom_steps
@@ -857,20 +870,52 @@ def workflow_run(
     # Parse inputs
     inputs = _parse_input_values(input_values)
 
+    if dry_run and not json_output:
+        console.print(
+            "\n[bold yellow]DRY RUN:[/bold yellow] previewing built-in "
+            "command, prompt, and gate steps without dispatching. "
+            "Other step types (e.g. shell, init) may still execute."
+        )
+
     if not json_output:
         console.print(f"\n[bold cyan]Running workflow:[/bold cyan] {definition.name} ({definition.id})")
         console.print(f"[dim]Version: {definition.version}[/dim]\n")
 
     try:
         with _stdout_to_stderr_when(json_output):
-            state = engine.execute(definition, inputs)
+            state = engine.execute(definition, inputs, dry_run=dry_run)
     except ValueError as exc:
+        if dry_run and not json_output:
+            _print_dry_run_previews(getattr(exc, "partial_state", None))
+        if json_output:
+            partial = getattr(exc, "partial_state", None)
+            if partial:
+                _emit_workflow_json(_workflow_run_payload(partial))
+            raise typer.Exit(
+                _run_outcome_exit_code(
+                    partial.status.value if partial else "failed"
+                )
+            )
         console.print(f"[red]Error:[/red] {exc}")
         raise typer.Exit(1)
     except Exception as exc:
+        if dry_run and not json_output:
+            _print_dry_run_previews(getattr(exc, "partial_state", None))
+        if json_output:
+            partial = getattr(exc, "partial_state", None)
+            if partial:
+                _emit_workflow_json(_workflow_run_payload(partial))
+            raise typer.Exit(
+                _run_outcome_exit_code(
+                    partial.status.value if partial else "failed"
+                )
+            )
         console.print(f"[red]Workflow failed:[/red] {exc}")
         raise typer.Exit(1)
 
+    if dry_run and not json_output:
+        _print_dry_run_previews(state)
+
     if json_output:
         _emit_workflow_json(_workflow_run_payload(state))
         raise typer.Exit(_run_outcome_exit_code(state.status.value))
@@ -891,6 +936,49 @@ def workflow_run(
     raise typer.Exit(_run_outcome_exit_code(state.status.value))
 
 
+def _print_dry_run_previews(state: Any) -> None:
+    """Print the dry-run preview message emitted by each step.
+
+    Called by ``workflow run`` after a successful dry-run and from
+    exception handlers so a mid-run failure still surfaces the
+    previews resolved by earlier steps. Skipped silently when
+    ``state`` is ``None`` (e.g. the engine raised before any step
+    ran) or when the run did not include a dry-run step.
+    """
+    if state is None:
+        return
+    step_results = getattr(state, "step_results", None) or {}
+    if not step_results:
+        return
+    # Only print the header when at least one step actually produced
+    # a dry-run preview — an empty section is confusing.
+    has_dry_run = any(
+        isinstance(r, dict) and (r.get("output") or {}).get("dry_run")
+        for r in step_results.values()
+    )
+    if not has_dry_run:
+        return
+    console.print("\n[bold yellow]DRY RUN previews:[/bold yellow]")
+    for step_id, result in step_results.items():
+        if not isinstance(result, dict):
+            continue
+        output = result.get("output") or {}
+        if not output.get("dry_run"):
+            continue
+        step_id_display = _escape_markup(str(step_id))
+        preview = output.get("dry_run_message") or output.get("message") or ""
+        preview_escaped = _escape_markup(preview)
+        console.print(f"  [cyan][{step_id_display}][/cyan] {preview_escaped}")
+
+
+def _escape_markup(text: str) -> str:
+    """Escape Rich markup characters so user-controlled text can be
+    printed safely. Delegates to ``rich.markup.escape`` for canonical
+    handling of ``[``, ``]``, ``{``, ``}``, and other special chars.
+    """
+    return _rich_escape_markup(text)
+
+
 @workflow_app.command("resume")
 def workflow_resume(
     run_id: str = typer.Argument(..., help="Run ID to resume"),
@@ -919,15 +1007,43 @@ def workflow_resume(
         with _stdout_to_stderr_when(json_output):
             state = engine.resume(run_id, inputs or None)
     except FileNotFoundError:
+        if json_output:
+            _emit_workflow_json({"error": "Run not found", "run_id": run_id})
+            raise typer.Exit(1)
         console.print(f"[red]Error:[/red] Run not found: {run_id}")
         raise typer.Exit(1)
     except ValueError as exc:
+        partial = getattr(exc, "partial_state", None)
+        if getattr(partial, "dry_run", False) and not json_output:
+            _print_dry_run_previews(partial)
+        if json_output:
+            if partial:
+                _emit_workflow_json(_workflow_run_payload(partial))
+            raise typer.Exit(
+                _run_outcome_exit_code(
+                    partial.status.value if partial else "failed"
+                )
+            )
         console.print(f"[red]Error:[/red] {exc}")
         raise typer.Exit(1)
     except Exception as exc:
+        partial = getattr(exc, "partial_state", None)
+        if getattr(partial, "dry_run", False) and not json_output:
+            _print_dry_run_previews(partial)
+        if json_output:
+            if partial:
+                _emit_workflow_json(_workflow_run_payload(partial))
+            raise typer.Exit(
+                _run_outcome_exit_code(
+                    partial.status.value if partial else "failed"
+                )
+            )
         console.print(f"[red]Resume failed:[/red] {exc}")
         raise typer.Exit(1)
 
+    if getattr(state, "dry_run", False) and not json_output:
+        _print_dry_run_previews(state)
+
     if json_output:
         _emit_workflow_json(_workflow_run_payload(state))
         raise typer.Exit(_run_outcome_exit_code(state.status.value))

src/specify_cli/integrations/copilot/__init__.py

@@ -173,18 +173,19 @@ def build_exec_args(
     def build_command_invocation(self, command_name: str, args: str = "") -> str:
         """Build the native invocation for a Copilot command.
 
-        Default mode: agents are not slash-commands — return args as prompt.
-        Skills mode: ``/speckit-<stem>`` slash-command dispatch.
+        Default mode: ``speckit.<stem> <args>`` (agent name + args).
+        Skills mode: ``/speckit-<stem> <args>`` (slash-command dispatch).
         """
+        stem = command_name
+        if stem.startswith("speckit."):
+            stem = stem[len("speckit."):]
         if self._skills_mode:
-            stem = command_name
-            if stem.startswith("speckit."):
-                stem = stem[len("speckit."):]
             invocation = "/speckit-" + stem.replace(".", "-")
-            if args:
-                invocation = f"{invocation} {args}"
-            return invocation
-        return args or ""
+        else:
+            invocation = f"speckit.{stem}"
+        if args:
+            invocation = f"{invocation} {args}"
+        return invocation
 
     def dispatch_command(
         self,

src/specify_cli/workflows/base.py

@@ -74,6 +74,21 @@ class StepContext:
     #: Current run ID.
     run_id: str | None = None
 
+    #: When ``True``, the built-in step implementations
+    #: (``command`` / ``prompt`` / ``gate``) short-circuit and return a
+    #: synthetic ``StepResult`` carrying a preview of what would have
+    #: been dispatched — no subprocess, no CLI call, no network I/O for
+    #: those step types. Custom steps and built-in steps that have not
+    #: been updated to honor ``dry_run`` may still perform their normal
+    #: side effects; the flag is opt-in per step. Step implementations
+    #: publish the preview on ``output["dry_run_message"]`` (consumed
+    #: by the CLI's preview loop). ``output["message"]`` preserves the
+    #: step's original value (e.g. the gate prompt or command name) so
+    #: ``{{ steps.<id>.output.message }}`` remains stable across dry-run
+    #: and real execution. Downstream templates that need the preview
+    #: text should reference ``output.dry_run_message``.
+    dry_run: bool = False
+
 
 @dataclass
 class StepResult:

src/specify_cli/workflows/engine.py

@@ -334,6 +334,11 @@ def __init__(
         self.created_at = datetime.now(timezone.utc).isoformat()
         self.updated_at = self.created_at
         self.log_entries: list[dict[str, Any]] = []
+        #: Whether the run was started in dry-run mode. Persisted via
+        #: :meth:`save` so :meth:`load` (and the resumed run's
+        #: ``StepContext``) can keep the run in preview mode across
+        #: process restarts.
+        self.dry_run: bool = False
 
     @property
     def runs_dir(self) -> Path:
@@ -352,6 +357,7 @@ def save(self) -> None:
             "current_step_index": self.current_step_index,
             "current_step_id": self.current_step_id,
             "step_results": self.step_results,
+            "dry_run": self.dry_run,
             "created_at": self.created_at,
             "updated_at": self.updated_at,
         }
@@ -398,6 +404,7 @@ def load(cls, run_id: str, project_root: Path) -> RunState:
         state.step_results = state_data.get("step_results", {})
         state.created_at = state_data.get("created_at", "")
         state.updated_at = state_data.get("updated_at", "")
+        state.dry_run = state_data.get("dry_run", False)
 
         inputs_path = runs_dir / "inputs.json"
         if inputs_path.exists():
@@ -478,6 +485,7 @@ def execute(
         definition: WorkflowDefinition,
         inputs: dict[str, Any] | None = None,
         run_id: str | None = None,
+        dry_run: bool = False,
     ) -> RunState:
         """Execute a workflow definition.
 
@@ -489,6 +497,21 @@ def execute(
             User-provided input values.
         run_id:
             Optional run ID (uses SPECKIT_WORKFLOW_RUN_ID when set, otherwise auto-generated).
+        dry_run:
+            Preview-only mode. When ``True``, the built-in ``command``,
+            ``prompt`` and ``gate`` step implementations skip
+            side-effecting work (AI invocations, interactive prompts,
+            subprocess dispatches) and emit a synthetic
+            ``dry_run_message`` instead. Other built-in steps (``init``,
+            ``shell``, custom user-registered steps) currently still
+            execute their normal logic during a dry run; the flag is
+            opt-in per step. ``dry_run`` propagates into each step's
+            ``StepContext`` and is persisted on the resulting
+            ``RunState`` so ``resume()`` keeps the run in preview mode
+            across restarts. Step ``output`` shape is unchanged;
+            downstream ``switch``/``do-while`` gates coerce any
+            dry-run-only fields (e.g. ``output.choice``) so the preview
+            branch is deterministic.
 
         Returns
         -------
@@ -507,6 +530,7 @@ def execute(
             workflow_id=definition.id,
             project_root=self.project_root,
         )
+        state.dry_run = dry_run
 
         # Persist a copy of the workflow definition so resume can
         # reload it even if the original source is no longer available
@@ -531,6 +555,7 @@ def execute(
             default_options=definition.default_options,
             project_root=str(self.project_root),
             run_id=state.run_id,
+            dry_run=dry_run,
         )
 
         # Execute steps
@@ -545,6 +570,10 @@ def execute(
             state.status = RunStatus.FAILED
             state.append_log({"event": "workflow_failed", "error": str(exc)})
             state.save()
+            # Attach the partially-populated state so the CLI can render
+            # any dry-run previews resolved by earlier steps when the
+            # engine raises mid-run (e.g. template resolution failure).
+            exc.partial_state = state  # type: ignore[attr-defined]
             raise
 
         if state.status == RunStatus.RUNNING:
@@ -587,7 +616,8 @@ def resume(
             merged = {**state.inputs, **inputs}
             state.inputs = self._resolve_inputs(definition, merged)
 
-        # Restore context
+        # Restore context — including the persisted ``dry_run`` flag so an
+        # interrupted dry-run stays a dry-run after a process restart.
         context = StepContext(
             inputs=state.inputs,
             steps=state.step_results,
@@ -596,6 +626,7 @@ def resume(
             default_options=definition.default_options,
             project_root=str(self.project_root),
             run_id=state.run_id,
+            dry_run=state.dry_run,
         )
 
         from . import STEP_REGISTRY
@@ -622,6 +653,10 @@ def resume(
             state.status = RunStatus.FAILED
             state.append_log({"event": "resume_failed", "error": str(exc)})
             state.save()
+            # Same preview surface as ``execute()`` — when the engine
+            # raises mid-resume the CLI wants the partially-resolved
+            # dry-run previews for debugging.
+            exc.partial_state = state  # type: ignore[attr-defined]
             raise
 
         if state.status == RunStatus.RUNNING: