diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6368346..a94287e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,6 +26,12 @@ jobs:
           # This job executes repository code (cargo build/test); don't persist
           # the token in git config.
           persist-credentials: false
+          # No `submodules:` entry on purpose: this repository has no
+          # submodules. The template it came from vendored `vendor/tinybus` for
+          # the loadable-module half, which was removed along with that half —
+          # there is no `.gitmodules` and no gitlink in the tree. Adding one
+          # back would be a no-op that implies a dependency this crate does not
+          # have.
 
       - uses: dtolnay/rust-toolchain@stable
         with:
diff --git a/README.md b/README.md
index 42438cf..9481c6d 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,7 @@ compiles neither the harness nor the host.
 | `classification` | `ToolScope`, `ToolCategory` — where a tool may run, and which belt it is on |
 | `call` | `ToolCallOptions`, `ToolTimeout` — per-invocation inputs that are not arguments |
 | `context` | `ToolRunContext` — the narrow seam onto a live run |
+| `workspace` | `WorkspaceDescriptor`, `SandboxMode` — the root a tool may touch, and how strictly it is sandboxed |
 | `naming` | `humanize_tool_name`, `context_detail_from_args` — rendering a call for a human |
 
 ## What is deliberately not here
diff --git a/crates/tinytools/src/tool/types.rs b/crates/tinytools/src/tool/types.rs
index ba93e6f..d8e6c46 100644
--- a/crates/tinytools/src/tool/types.rs
+++ b/crates/tinytools/src/tool/types.rs
@@ -25,11 +25,12 @@ use crate::spec::ToolSpec;
 /// That split is the point. A tool never enforces policy on itself — it
 /// describes itself accurately and the host enforces.
 ///
-/// # The defaults are not uniformly safe, and two of them fail OPEN
+/// # The defaults are not uniformly safe — four of them are permissive
 ///
-/// Most defaults are the cautious answer — [`Self::scope`] is `All`,
-/// [`Self::is_concurrency_safe`] is `false`, [`Self::timeout_policy`] inherits
-/// the host's bound. Three are not, and a tool author who assumes otherwise
+/// Two defaults are genuinely cautious: [`Self::is_concurrency_safe`] is
+/// `false`, so nothing is dispatched in parallel unless a tool says it is safe,
+/// and [`Self::timeout_policy`] inherits the host's bound rather than opting
+/// out of it. **Four are permissive**, and a tool author who assumes otherwise
 /// ships a hole:
 ///
 /// - **[`Self::external_effect`] defaults to `false`.** A tool that sends an
@@ -45,8 +46,12 @@ use crate::spec::ToolSpec;
 /// - **[`Self::permission_level`] defaults to
 ///   [`PermissionLevel::ReadOnly`]**, not [`PermissionLevel::None`], because
 ///   most tools genuinely read — but a writing tool must say so.
+/// - **[`Self::scope`] defaults to [`ToolScope::All`]**, the *widest* setting:
+///   the tool is offered to the autonomous agent loop, the CLI and RPC alike. A
+///   tool that should only ever be driven deliberately by a human has to say
+///   [`ToolScope::CliRpcOnly`]; leaving the default hands it to the loop.
 ///
-/// If you are reviewing a `Tool` impl, those three are what to check for
+/// If you are reviewing a `Tool` impl, those four are what to check for
 /// absence. The rest are safe to leave alone.
 #[async_trait]
 pub trait Tool: Send + Sync {