fix(blocks): one block definition service for delete, rename and purge on every path

new src/scene/block_service.rs (references, delete, rename, purge candidates, name validation, one error type and message). The command-line RENAME, palette Remove, plugin API, control/MCP block_delete and PURGE all use it. Layout, xref, dynamic-block, anonymous and open-in-editor records are protected; PURGE removes an anonymous block only when nothing references it. PROTOCOL CHANGE: control/MCP block_delete refuses a referenced block unless force=true (erases referencing INSERTs in one undo step). New REST route DELETE /api/v1/blocks/{name}?force=true. MCP tool digest re-pinned. Undo labels are Delete block X, Rename block X to Y and Purge.

docs/automation/API-SPEC.md

@@ -316,10 +316,10 @@ registry with write rules), `properties`, `measure` (length/area/bounds),
 | Op | Fields | Semantics |
 |---|---|---|
 | `block_define` | `name`, `base:[x,y,z]`, `handles`, optional `insert_at`, optional `"replace":true` | The sources move into the new definition (flattened at `base` = block origin) and one `Insert` is placed at `insert_at` (default `base`), so the drawing looks unchanged. `"replace":true` drops a same-named definition — children, markers and inserts — inside the same undo step before creating the new one (idempotent re-import). Result `{"block":name,"insert":"<handle>"}`. Names are unique, `*` is reserved. |
-| `block_delete` | `name` | Removes the definition completely: child entities, block markers, every `Insert` referencing it and the table record. One undo step. Result `erased`. Unknown → `block_missing`; `*`-records → `block_protected`. |
+| `block_delete` | `name`, optional `"force":true` | Removes the definition completely: child entities, block markers and the table record. One undo step (`Delete block <name>`). A referenced block is refused (`block_referenced`); `"force":true` erases the referencing INSERTs in the same step and reports `result.references`. Result `erased`. Unknown → `block_missing`; layout/anonymous/xref/dynamic records → `block_protected`; open BEDIT session → `block_in_edit`; invalid/taken names → `block_invalid_name` / `block_exists`. |
 | `wblock` | `path`, `handles` *or* `block`; optional `"template":"<file>"` (the export inherits that file's tables/styles), optional `"normalize":true` (the export is shifted so its overall bounds minimum lands on the origin) | Writes a standalone DWG/DXF (extension decides). The source document is untouched. Result `{path, entities, normalized}`. |
 
-REST: `POST /blocks`, `DELETE /blocks/{name}`, `POST /wblock`.
+REST: `POST /blocks`, `DELETE /blocks/{name}` (add `?force=true` to erase the referencing INSERTs instead of being refused), `POST /wblock`.
 
 ### 6.6 Layouts and plotting
 

docs/automation/README.md

@@ -701,9 +701,15 @@ definition — its children, markers and inserts — inside the same undo step
 before creating the new one: that is SPM's barcode re-import flow, so
 `block_define` never fails with "already exists" on a re-import.
 `block_delete` removes a definition completely (children, Block/BlockEnd
-markers, every Insert referencing it and the table record) and reports
-`result.erased`; unknown names are `block_missing`, `*`-prefixed layout
-records are `block_protected`. Definitions survive save/open round trips
+markers and the table record). A definition anything still points at — an
+INSERT, a dimension-style arrow block, a multi-leader's block content — is
+refused with `block_referenced` and the shared message text; add
+`"force":true` to erase the referencing INSERTs in the same undo step and get
+`result.references` with the number that were overridden. `result.erased`
+counts every entity the step removed. Unknown names are `block_missing`,
+`*`-prefixed layout records, anonymous and xref definitions are
+`block_protected`, and a block with an open BEDIT session is `block_in_edit`.
+Definitions survive save/open round trips
 and are consumable by `wblock` (by block name) and `INSERT` creation via
 `entities_create`.
 

src/app/commands/styleprops.rs

@@ -358,62 +358,6 @@ impl OpenCADStudio {
                         .map(|s| s.to_uppercase())
                         .collect();
 
-                    // Live blocks are reachable from layouts and style roots
-                    // through the shared graph. Dangling layouts do not count.
-                    let live_blocks: rustc_hash::FxHashSet<String> = {
-                        let doc = &self.tabs[i].scene.document;
-                        let is_real_layout = |br: &codec::BlockRecord| -> bool {
-                            let up = br.name.to_ascii_uppercase();
-                            up.starts_with("*MODEL_SPACE")
-                                || up.starts_with("*PAPER_SPACE")
-                                || matches!(
-                                    doc.objects.get(&br.layout),
-                                    Some(codec::objects::ObjectType::Layout(_))
-                                )
-                        };
-                        let children = |name: &str| -> Vec<String> {
-                            let mut out = Vec::new();
-                            let Some(br) = doc.block_records.get(name) else {
-                                return out;
-                            };
-                            for &h in &br.entity_handles {
-                                let Some(entity) = doc.get_entity(h) else {
-                                    continue;
-                                };
-                                out.extend(
-                                    crate::scene::render_graph::entity_block_uses(doc, entity, 1.0)
-                                        .into_iter()
-                                        .filter(|block_use| !block_use.block.is_null())
-                                        .map(|block_use| block_use.insert.block_name),
-                                );
-                            }
-                            out
-                        };
-                        let mut live = rustc_hash::FxHashSet::default();
-                        let mut stack: Vec<String> = doc
-                            .block_records
-                            .iter()
-                            .filter(|&br| is_real_layout(br))
-                            .map(|br| br.name.clone())
-                            .collect();
-                        stack.extend(
-                            crate::scene::render_graph::document_block_uses(doc)
-                                .into_iter()
-                                .map(|block_use| block_use.insert.block_name),
-                        );
-                        while let Some(n) = stack.pop() {
-                            if !live.insert(n.clone()) {
-                                continue;
-                            }
-                            for c in children(&n) {
-                                if !live.contains(&c) {
-                                    stack.push(c);
-                                }
-                            }
-                        }
-                        live
-                    };
-
                     // Build removal lists (still immutable)
                     let layer_remove: Vec<String> = if do_layers {
                         self.tabs[i]
@@ -466,26 +410,21 @@ impl OpenCADStudio {
                         vec![]
                     };
 
-                    // Remove unreachable blocks but retain live xrefs and space containers.
+                    // Remove blocks nothing references any more. The shared
+                    // service decides what qualifies — layout/xref/dynamic
+                    // records and open BEDIT sessions are protected, and so is
+                    // every reference kind — so a purge and a delete give the
+                    // same answer.
                     let block_remove: Vec<String> = if do_blocks {
-                        self.tabs[i]
-                            .scene
-                            .document
-                            .block_records
+                        let open_edits: Vec<codec::Handle> = self.tabs[i]
+                            .block_edits
                             .iter()
-                            .filter(|br| {
-                                let up = br.name.to_ascii_uppercase();
-                                // Never PURGE an xref *definition* — that is a
-                                // detach, not a purge. Orphaned dependencies from
-                                // a past detach still use the reachability test.
-                                !br.flags.is_xref
-                                    && !br.flags.is_xref_overlay
-                                    && !up.starts_with("*MODEL_SPACE")
-                                    && !up.starts_with("*PAPER_SPACE")
-                                    && !live_blocks.contains(&br.name)
-                            })
-                            .map(|br| br.name.clone())
-                            .collect()
+                            .map(|session| session.br_handle)
+                            .collect();
+                        crate::scene::block_service::purge_candidates(
+                            &self.tabs[i].scene.document,
+                            &open_edits,
+                        )
                     } else {
                         vec![]
                     };
@@ -501,7 +440,7 @@ impl OpenCADStudio {
                     // Snapshot the pre-purge document once, before the first
                     // removal, so a single UNDO restores everything.
                     if !snapshot_pushed {
-                        self.push_undo_snapshot(i, "PURGE");
+                        self.push_undo_snapshot(i, "Purge");
                         snapshot_pushed = true;
                     }
 
@@ -523,26 +462,11 @@ impl OpenCADStudio {
                         .count();
                     let mut blocks_gone = 0usize;
                     for name in &block_remove {
-                        // Drop the block definition's member entities (and the
-                        // BLOCK/ENDBLK delimiters) before the record so no orphaned
-                        // geometry survives in the document entity list.
-                        let handles: Vec<_> =
-                            if let Some(br) = self.tabs[i].scene.document.block_records.get(name) {
-                                let mut h = br.entity_handles.clone();
-                                h.push(br.block_entity_handle);
-                                h.push(br.block_end_handle);
-                                h
-                            } else {
-                                Vec::new()
-                            };
-                        for h in handles {
-                            self.tabs[i].scene.document.remove_entity(h);
-                        }
-                        if self.tabs[i]
-                            .scene
-                            .document
-                            .block_records
-                            .remove(name)
+                        // The service erases the definition, its member
+                        // entities, both BLOCK/ENDBLK delimiters and any stale
+                        // draw-order table, so a purge and a delete leave the
+                        // same document behind.
+                        if crate::scene::block_service::erase(&mut self.tabs[i].scene, name)
                             .is_some()
                         {
                             blocks_gone += 1;
@@ -586,7 +510,7 @@ impl OpenCADStudio {
                         // re-assignment needed (a block purge already snapshotted;
                         // a snapshot here only matters when nothing else changed).
                         if !snapshot_pushed {
-                            self.push_undo_snapshot(i, "PURGE");
+                            self.push_undo_snapshot(i, "Purge");
                         }
                         for h in &orphans {
                             self.tabs[i].scene.document.objects.remove(h);
@@ -3392,7 +3316,13 @@ impl OpenCADStudio {
                 } else {
                     // Snapshot BEFORE mutating (undo must restore the old
                     // name); dropped again if nothing was renamed.
-                    self.push_undo_snapshot(i, "RENAME");
+                    let block = type_str == "BLOCK";
+                    let label = if block {
+                        format!("Rename block {old_name} to {new_name}")
+                    } else {
+                        "RENAME".to_string()
+                    };
+                    self.push_undo_snapshot(i, label);
                     let known = matches!(
                         type_str.as_str(),
                         "LAYER"
@@ -3405,11 +3335,31 @@ impl OpenCADStudio {
                             | "UCS"
                             | "VIEW"
                     );
-                    let ok = if type_str == "BLOCK" {
+                    // The block path's refusal text comes from the shared
+                    // service, so the command line, the palette, the plugin
+                    // API and the control op all word it the same way.
+                    let mut block_error: Option<String> = None;
+                    let ok = if block {
+                        let open_edits: Vec<codec::Handle> = self.tabs[i]
+                            .block_edits
+                            .iter()
+                            .map(|session| session.br_handle)
+                            .collect();
                         // Re-keys the record, syncs the Block marker and every
-                        // INSERT reference; refuses anonymous/xref sources and
-                        // invalid/taken names.
-                        self.tabs[i].scene.rename_block(&old_name, &new_name)
+                        // INSERT reference; refuses anonymous/xref sources,
+                        // protected records and invalid/taken names.
+                        match crate::scene::block_service::rename(
+                            &mut self.tabs[i].scene,
+                            &old_name,
+                            &new_name,
+                            &open_edits,
+                        ) {
+                            Ok(_) => true,
+                            Err(error) => {
+                                block_error = Some(error.to_string());
+                                false
+                            }
+                        }
                     } else if type_str == "LAYER" {
                         self.tabs[i].rename_layer(&old_name, &new_name)
                     } else if known {
@@ -3444,13 +3394,10 @@ impl OpenCADStudio {
                         );
                     } else {
                         self.discard_last_undo_entry(i);
-                        if !known {
+                        if let Some(message) = block_error {
+                            self.command_line.push_error(&message);
+                        } else if !known {
                             self.command_line.push_error(crate::tf!("RENAME: unknown type '{}'. Use LAYER BLOCK STYLE DIMSTYLE LINETYPE UCS VIEW", type_str).as_ref());
-                        } else if type_str == "BLOCK" {
-                            self.command_line.push_error(crate::tf!(
-                                "RENAME: could not rename block '{}' — missing/anonymous/xref, or '{}' is invalid or taken.",
-                                old_name, new_name
-                            ).as_ref());
                         } else {
                             self.command_line.push_error(crate::tf!(
                                 "RENAME: could not rename '{}' in {} — not found or protected, or '{}' is invalid or taken.",

src/app/control/entities.rs

@@ -899,33 +899,37 @@ impl OpenCADStudio {
         Ok(Task::none())
     }
 
-    /// `block_delete` — remove a block definition together with its child
-    /// entities, the Block/BlockEnd markers and every Insert referencing it.
+    /// `block_delete` — remove a block definition. A definition something
+    /// still points at is refused unless the request carries `"force": true`,
+    /// which erases the referencing INSERTs in the same undo step.
     pub(super) fn control_block_delete(&mut self, req: &Value) -> Result<Task<Message>, Value> {
         let name = string(req, "name")?.to_owned();
-        if name.starts_with('*') {
-            return Err(failure(
-                "block_protected",
-                "Layout block records cannot be deleted",
-            ));
-        }
+        let force = req["force"].as_bool().unwrap_or(false);
         let i = self.active_tab;
-        if self.tabs[i]
-            .scene
-            .document
-            .block_records
-            .get(&name)
-            .is_none()
-        {
-            return Err(failure(
-                "block_missing",
-                format!("Block '{name}' does not exist"),
-            ));
-        }
-        self.push_undo_snapshot(i, "BLOCKDELETE");
-        let erased = erase_block_definition(&mut self.tabs[i].scene, &name);
+        let open_edits: Vec<codec::Handle> = self.tabs[i]
+            .block_edits
+            .iter()
+            .map(|session| session.br_handle)
+            .collect();
+        self.push_undo_snapshot(i, format!("Delete block {name}"));
+        let options = crate::scene::block_service::DeleteOptions {
+            force,
+            open_edits: &open_edits,
+        };
+        let outcome =
+            match crate::scene::block_service::delete(&mut self.tabs[i].scene, &name, options) {
+                Ok(outcome) => outcome,
+                Err(error) => {
+                    self.discard_last_undo_entry(i);
+                    return Err(failure(block_error_code(&error), error.to_string()));
+                }
+            };
         self.post_ref_op(i);
-        self.set_control_result(json!({ "block": name, "erased": erased }));
+        self.set_control_result(json!({
+            "block": outcome.name,
+            "erased": outcome.erased,
+            "references": outcome.references.len(),
+        }));
         Ok(Task::none())
     }
 
@@ -988,6 +992,21 @@ pub(crate) fn erase_block_definition(scene: &mut crate::scene::Scene, name: &str
     victims.len()
 }
 
+/// The automation error code for each [`BlockServiceError`], so a headless
+/// client branches on a stable machine-readable code while the text stays the
+/// one the shared formatter produced.
+fn block_error_code(error: &crate::scene::block_service::BlockServiceError) -> &'static str {
+    use crate::scene::block_service::BlockServiceError as E;
+    match error {
+        E::NotFound(_) => "block_missing",
+        E::InvalidName(_) => "block_invalid_name",
+        E::NameExists(_) => "block_exists",
+        E::Referenced { .. } => "block_referenced",
+        E::InEditSession(_) => "block_in_edit",
+        E::Protected(_) => "block_protected",
+    }
+}
+
 /// `data:[{code,value},…]` → typed XData values; an absent or empty list
 /// means "remove this application's record".
 fn parse_xdata_values(req: &Value) -> Parsed<Option<Vec<codec::xdata::XDataValue>>> {

src/app/control/mod.rs

@@ -1631,7 +1631,6 @@ mod actions;
 pub(crate) mod vision;
 pub(crate) use actions::property_json;
 mod entities;
-pub(crate) use entities::erase_block_definition;
 #[cfg(not(target_arch = "wasm32"))]
 pub(crate) mod http_bridge;
 mod interactive;

src/app/control/p1_tests.rs

@@ -551,11 +551,29 @@ fn block_delete_and_define_replace_manage_definitions() {
     assert_eq!(count_type(&mut app, "Line"), 0, "old children erased");
     assert_eq!(count_type(&mut app, "Circle"), 0, "old children erased");
 
+    // A definition the insert still points at is refused; "force":true erases
+    // the referencing inserts in the same undo step.
+    let r = app.automation_op(&format!(
+        r#"{{"protocol":1,"op":"block_delete","request_id":"bl1b","document_id":{doc},"name":"MARK"}}"#
+    ));
+    assert_eq!(r["ok"], false);
+    assert_eq!(r["code"], "block_referenced");
+    assert_eq!(
+        count_type(&mut app, "Insert"),
+        1,
+        "the insert survived the refusal"
+    );
+
     // Delete removes the insert, the markers, the children and the record.
     let r = app.automation_op(&format!(
-        r#"{{"protocol":1,"op":"block_delete","request_id":"bl2","document_id":{doc},"name":"MARK"}}"#
+        r#"{{"protocol":1,"op":"block_delete","request_id":"bl2","document_id":{doc},"name":"MARK","force":true}}"#
     ));
     assert_eq!(r["ok"], true, "{}", r["error"]);
+    assert_eq!(
+        r["result"]["references"].as_u64().unwrap(),
+        1,
+        "the forced delete reports what it overrode"
+    );
     assert!(
         r["result"]["erased"].as_u64().unwrap() >= 3,
         "insert + markers + child"

src/app/plugin_host.rs

@@ -2337,80 +2337,77 @@ impl<'a> HostSession<'a> {
                 Ok(handle)
             }
             TableOperation::BlockRename { from, to } => {
-                let (from, handle) = editable_block(self.document(), from.trim())?;
-                let to = validated_symbol_name(&to, "a block name")?;
-                if to.starts_with('*') {
-                    return Err("a block name cannot start with '*'".to_owned());
+                let from = from.trim().to_owned();
+                let to = to.trim().to_owned();
+                let open_edits = self.open_block_edits();
+                let handle = self
+                    .document()
+                    .block_records
+                    .get(&from)
+                    .map(|record| record.handle)
+                    .unwrap_or(Handle::NULL);
+                self.push_undo(&format!("Rename block {from} to {to}"));
+                match crate::scene::block_service::rename(
+                    &mut self.app.tabs[self.tab].scene,
+                    &from,
+                    &to,
+                    &open_edits,
+                ) {
+                    Ok(_) => {
+                        self.finish_block_change();
+                        Ok(handle)
+                    }
+                    Err(error) => {
+                        self.app.discard_last_undo_entry(self.tab);
+                        Err(error.to_string())
+                    }
                 }
-                if from.eq_ignore_ascii_case(&to) {
-                    return Err("the new block name matches the current one (a case-only change is not supported)".to_owned());
-                }
-                if self.document().block_records.get(&to).is_some() {
-                    return Err(format!("block {to:?} already exists"));
-                }
-                self.push_undo("Rename block");
-                if !self.app.tabs[self.tab].scene.rename_block(&from, &to) {
-                    return Err("the block could not be renamed".to_owned());
-                }
-                self.finish_block_change();
-                Ok(handle)
             }
             TableOperation::BlockDelete { name } => {
-                let (name, handle) = editable_block(self.document(), name.trim())?;
-                let doc = self.document();
-                let referenced = doc.entities().any(|entity| match entity {
-                    E::Insert(insert) => insert.block_name.eq_ignore_ascii_case(&name),
-                    E::MultiLeader(leader) => {
-                        leader.block_content_handle == Some(handle)
-                            || leader.context.block_content_handle == Some(handle)
+                let name = name.trim().to_owned();
+                // The external API has no force flag, so a referenced block is
+                // always refused here — same rule as the palette.
+                let open_edits = self.open_block_edits();
+                let handle = self
+                    .document()
+                    .block_records
+                    .get(&name)
+                    .map(|record| record.handle)
+                    .unwrap_or(Handle::NULL);
+                self.push_undo(&format!("Delete block {name}"));
+                match crate::scene::block_service::delete(
+                    &mut self.app.tabs[self.tab].scene,
+                    &name,
+                    crate::scene::block_service::DeleteOptions {
+                        force: false,
+                        open_edits: &open_edits,
+                    },
+                ) {
+                    Ok(_) => {
+                        self.finish_block_change();
+                        Ok(handle)
+                    }
+                    Err(error) => {
+                        self.app.discard_last_undo_entry(self.tab);
+                        Err(error.to_string())
                     }
-                    _ => false,
-                }) || doc.dim_styles.iter().any(|style| {
-                    [style.dimblk, style.dimblk1, style.dimblk2, style.dimldrblk].contains(&handle)
-                });
-                if referenced {
-                    return Err(format!(
-                        "block {name:?} is still inserted or used by a style or leader"
-                    ));
                 }
-                let members: Vec<Handle> = {
-                    let record = doc.block_records.get(&name).expect("checked above");
-                    let mut members = record.entity_handles.clone();
-                    members.push(record.block_entity_handle);
-                    members.push(record.block_end_handle);
-                    members
-                };
-                self.push_undo("Delete block");
-                let doc = self.document_mut();
-                for member in members {
-                    doc.remove_entity(member);
-                }
-                doc.block_records.remove(&name);
-                let orphans: Vec<Handle> = {
-                    let live: std::collections::HashSet<Handle> =
-                        doc.block_records.iter().map(|r| r.handle).collect();
-                    doc.objects
-                        .iter()
-                        .filter_map(|(h, object)| match object {
-                            codec::objects::ObjectType::SortEntitiesTable(table)
-                                if !live.contains(&table.block_owner_handle) =>
-                            {
-                                Some(*h)
-                            }
-                            _ => None,
-                        })
-                        .collect()
-                };
-                for orphan in orphans {
-                    doc.objects.remove(&orphan);
-                }
-                self.finish_block_change();
-                Ok(handle)
             }
             _ => Err("unsupported table operation".to_owned()),
         }
     }
 
+    /// Block records this document has open in a BEDIT session. Nested
+    /// sessions all count, so the whole stack is handed to the block service,
+    /// which refuses delete/rename and skips PURGE for every one of them.
+    fn open_block_edits(&self) -> Vec<Handle> {
+        self.app.tabs[self.tab]
+            .block_edits
+            .iter()
+            .map(|session| session.br_handle)
+            .collect()
+    }
+
     fn finish_block_change(&mut self) {
         self.app.tabs[self.tab].dirty = true;
         self.app.tabs[self.tab].scene.invalidate_dependency_index();

src/app/update/blocks_palette.rs

@@ -491,20 +491,31 @@ impl OpenCADStudio {
                 Tab::Current => {
                     let name = item.name();
                     let i = self.active_tab;
-                    let referenced = self.tabs[i].scene.document.entities().any(|e| {
-                        matches!(e, codec::EntityType::Insert(ins) if ins.block_name.eq_ignore_ascii_case(&name))
-                    });
-                    if referenced {
-                        self.command_line.push_error(&crate::tf!(
-                            "Block \"{name}\" is referenced in the drawing and cannot be removed."
-                        ));
-                    } else {
-                        self.push_undo_snapshot(i, "PURGE");
-                        crate::app::control::erase_block_definition(&mut self.tabs[i].scene, &name);
-                        self.tabs[i].dirty = true;
-                        self.command_line
-                            .push_output(&crate::tf!("Block \"{name}\" removed."));
-                        self.refresh_block_palette();
+                    let open_edits: Vec<codec::Handle> = self.tabs[i]
+                        .block_edits
+                        .iter()
+                        .map(|session| session.br_handle)
+                        .collect();
+                    self.push_undo_snapshot(i, format!("Delete block {name}"));
+                    let outcome = crate::scene::block_service::delete(
+                        &mut self.tabs[i].scene,
+                        &name,
+                        crate::scene::block_service::DeleteOptions {
+                            force: false,
+                            open_edits: &open_edits,
+                        },
+                    );
+                    match outcome {
+                        Ok(_) => {
+                            self.tabs[i].dirty = true;
+                            self.command_line
+                                .push_output(&crate::tf!("Block \"{name}\" removed."));
+                            self.refresh_block_palette();
+                        }
+                        Err(error) => {
+                            self.discard_last_undo_entry(i);
+                            self.command_line.push_error(&error.to_string());
+                        }
                     }
                 }
                 Tab::Recent | Tab::Favorites => {

src/app/update/mod.rs

@@ -93,6 +93,8 @@ fn reorder_insertion_index(from: usize, to: usize, after: bool, len: usize) -> O
     (insertion != from).then_some(insertion)
 }
 
+#[cfg(test)]
+mod block_ops_tests;
 mod blocks_palette;
 mod command;
 mod context_menu;

src/mcp.rs

@@ -28,8 +28,10 @@ const MODERN_PROTOCOL_VERSION: &str = "2026-07-28";
 /// The `tool_schema_digest_is_pinned` test fails whenever the MCP tool surface
 /// changes, so schema drift (new params, renamed tools) is always a conscious,
 /// reviewed edit — and clients can detect a stale bridge by comparing digests.
+///
+/// `block_delete` gained its optional `force` parameter.
 #[cfg(test)]
-const TOOL_SCHEMA_DIGEST: &str = "e7bd01696f57143d7139aeb75d53389450b1102b603f2ba4ace8122cc692070e";
+const TOOL_SCHEMA_DIGEST: &str = "c16572f139198d90807ede156370879106672ed97566c16ab6ae001c996059e8";
 const MAX_REQUEST: usize = 1_048_576;
 const MAX_RESPONSE: u64 = 16 * 1024 * 1024;
 const CACHE_TTL_MS: u64 = 3_600_000;

src/mcp_ops.rs

@@ -534,11 +534,18 @@ pub static BLOCK_DEFINE: OpDef = OpDef {
 
 pub static BLOCK_DELETE: OpDef = OpDef {
     name: "block_delete",
-    doc: "Delete a block definition and all its child entities and inserts.",
+    doc: "Delete a block definition and all its child entities. A referenced block is refused; force erases the referencing inserts.",
     batchable: true,
-    params: &[req("name", Ty::Str, "Block name to delete.")],
+    params: &[
+        req("name", Ty::Str, "Block name to delete."),
+        opt(
+            "force",
+            Ty::Bool,
+            "Erase the referencing inserts instead of refusing a referenced block. Result reports how many references were overridden.",
+        ),
+    ],
     rules: &[],
-    example: r#"{"op":"block_delete","name":"DOOR"}"#,
+    example: r#"{"op":"block_delete","name":"DOOR","force":true}"#,
 };
 
 pub static XDATA_SET: OpDef = OpDef {

src/rest.rs

@@ -676,11 +676,22 @@ pub(crate) fn plan(method: &str, rest: &[&str], request: &HttpRequest) -> Plan {
             fields: body,
             created: 201,
         },
-        ("DELETE", ["blocks", name]) => Plan::Mutate {
-            op: "block_delete".into(),
-            fields: json!({"name": name}),
-            created: 200,
-        },
+        ("DELETE", ["blocks", name]) => {
+            // `?force=true` mirrors the control op: it erases the referencing
+            // inserts instead of refusing a referenced definition.
+            let mut fields = json!({"name": name});
+            if request
+                .param("force")
+                .is_some_and(|value| value == "true" || value == "1")
+            {
+                fields["force"] = json!(true);
+            }
+            Plan::Mutate {
+                op: "block_delete".into(),
+                fields,
+                created: 200,
+            }
+        }
         ("POST", ["file-identity"]) => Plan::Mutate {
             op: "file_identity".into(),
             fields: body,
@@ -1440,13 +1451,21 @@ mod tests {
             &mut counter,
         );
         assert_eq!(status, 201, "{body}");
+        // A definition the insert still points at is refused without force.
         let (status, body) = route(
             &mut app,
             &request("DELETE", "/api/v1/blocks/MARK", ""),
             &mut document_id,
             &mut counter,
         );
+        assert_eq!(status, 400, "{body}");
+        assert_eq!(body["code"], "block_referenced", "{body}");
+        // `?force=true` erases the referencing insert in the same step.
+        let mut forced = request("DELETE", "/api/v1/blocks/MARK", "");
+        forced.query = vec![("force".into(), "true".into())];
+        let (status, body) = route(&mut app, &forced, &mut document_id, &mut counter);
         assert_eq!(status, 200, "{body}");
+        assert_eq!(body["result"]["references"], 1, "{body}");
         assert!(body["result"]["erased"].as_u64().unwrap() >= 1);
         let (status, body) = route(
             &mut app,

src/scene/mod.rs

@@ -6,6 +6,7 @@
 //   view    — camera, transforms, viewport, render pipeline driver
 //   cache   — block-definition and property caches
 pub mod annotative;
+pub mod block_service;
 pub mod cache;
 pub mod convert;
 pub mod creation_style;

src/scene/render_graph.rs

@@ -1027,44 +1027,6 @@ pub fn entity_block_uses(
     uses
 }
 
-/// Blocks referenced by document-level styles rather than a concrete entity.
-pub fn document_block_uses(document: &CadDocument) -> Vec<BlockUse> {
-    let mut uses = Vec::new();
-    for style in document.dim_styles.iter() {
-        for handle in [style.dimblk, style.dimblk1, style.dimblk2, style.dimldrblk] {
-            push_dependency_use(&mut uses, document, handle, BlockRole::ArrowHead);
-        }
-        for name in [&style.dimblk_name, &style.dimblk1_name, &style.dimblk2_name] {
-            if let Some(record) = block_record_by_name(document, name) {
-                push_dependency_use(&mut uses, document, record.handle, BlockRole::ArrowHead);
-            }
-        }
-    }
-    for object in document.objects.values() {
-        let codec::objects::ObjectType::MultiLeaderStyle(style) = object else {
-            continue;
-        };
-        if let Some(handle) = style.arrowhead_handle {
-            push_dependency_use(&mut uses, document, handle, BlockRole::ArrowHead);
-        }
-        if let Some(handle) = style.block_content_handle {
-            push_dependency_use(&mut uses, document, handle, BlockRole::MultiLeaderContent);
-        }
-    }
-    for line_type in document.line_types.iter() {
-        for symbol in crate::scene::convert::dgn_linestyle::symbol_blocks(document, &line_type.name)
-        {
-            push_dependency_use(
-                &mut uses,
-                document,
-                symbol.block,
-                BlockRole::LineStyleSymbol,
-            );
-        }
-    }
-    uses
-}
-
 const MAX_MINSERT_INSTANCES: usize = 20_000;
 
 pub fn array_offsets(insert: &Insert) -> Vec<[f64; 3]> {