diff --git a/editor/CMakeLists.txt b/editor/CMakeLists.txt
index 2569382..4a3755f 100644
--- a/editor/CMakeLists.txt
+++ b/editor/CMakeLists.txt
@@ -4783,4 +4783,13 @@ target_link_libraries(step655_test PRIVATE
     tree_sitter_javascript tree_sitter_typescript
     tree_sitter_java tree_sitter_rust tree_sitter_go)
 
+add_executable(step656_test tests/step656_test.cpp)
+target_include_directories(step656_test PRIVATE src)
+target_link_libraries(step656_test PRIVATE
+    nlohmann_json::nlohmann_json
+    unofficial::tree-sitter::tree-sitter
+    tree_sitter_python tree_sitter_cpp tree_sitter_elisp
+    tree_sitter_javascript tree_sitter_typescript
+    tree_sitter_java tree_sitter_rust tree_sitter_go)
+
 # Step 12: Dear ImGui shell scaffolding created (main.cpp exists but not built due to dependencies)
diff --git a/editor/src/ApiaryBrowserPanelModel.h b/editor/src/ApiaryBrowserPanelModel.h
new file mode 100644
index 0000000..bdce4ad
--- /dev/null
+++ b/editor/src/ApiaryBrowserPanelModel.h
@@ -0,0 +1,36 @@
+#pragma once
+// Step 656: Apiary browser panel model
+
+#include <string>
+#include <vector>
+
+struct ApiaryToolEntry {
+    std::string name;
+    std::string version;
+    std::string language;
+    std::vector<std::string> capabilities;
+    std::string docSummary;
+    std::string sourcePath;
+};
+
+class ApiaryBrowserPanelModel {
+public:
+    static std::vector<ApiaryToolEntry> filterByCapability(const std::vector<ApiaryToolEntry>& entries,
+                                                           const std::string& capability) {
+        if (capability.empty()) return entries;
+        std::vector<ApiaryToolEntry> out;
+        for (const auto& e : entries) {
+            for (const auto& cap : e.capabilities) {
+                if (cap == capability) {
+                    out.push_back(e);
+                    break;
+                }
+            }
+        }
+        return out;
+    }
+
+    static std::string title(const ApiaryToolEntry& entry) {
+        return entry.name + " v" + entry.version;
+    }
+};
diff --git a/editor/tests/step656_test.cpp b/editor/tests/step656_test.cpp
new file mode 100644
index 0000000..b6022ec
--- /dev/null
+++ b/editor/tests/step656_test.cpp
@@ -0,0 +1,29 @@
+// Step 656: Apiary browser panel (12 tests)
+
+#include "ApiaryBrowserPanelModel.h"
+#include <iostream>
+static int p=0,f=0;
+#define T(n) { std::cout<<"  "<<#n<<"... "; }
+#define P() { std::cout<<"PASS\n"; ++p; }
+#define F(m) { std::cout<<"FAIL: "<<m<<"\n"; ++f; }
+#define C(c,m) if(!(c)){F(m);return;}
+
+static std::vector<ApiaryToolEntry> tools(){
+return {{"nexus","1.0","cpp",{"db","jobs"},"nexus tool","/mnt/nas/swarm_tools/nexus.cpp"},
+{"drone","2.1","rust",{"jobs","executor"},"drone tool","/mnt/nas/swarm_tools/drone.rs"},
+{"vision","0.9","python",{"cv"},"vision tool","/mnt/nas/swarm_tools/vision.py"}};}
+
+void t1(){T(empty_capability_returns_all);auto r=ApiaryBrowserPanelModel::filterByCapability(tools(),"");C(r.size()==3,"all");P();}
+void t2(){T(filter_jobs_returns_two);auto r=ApiaryBrowserPanelModel::filterByCapability(tools(),"jobs");C(r.size()==2,"jobs");P();}
+void t3(){T(filter_cv_returns_one);auto r=ApiaryBrowserPanelModel::filterByCapability(tools(),"cv");C(r.size()==1,"cv");P();}
+void t4(){T(filter_missing_returns_zero);auto r=ApiaryBrowserPanelModel::filterByCapability(tools(),"none");C(r.empty(),"none");P();}
+void t5(){T(filter_preserves_order);auto r=ApiaryBrowserPanelModel::filterByCapability(tools(),"jobs");C(r[0].name=="nexus"&&r[1].name=="drone","order");P();}
+void t6(){T(title_includes_name);C(ApiaryBrowserPanelModel::title(tools()[0]).find("nexus")!=std::string::npos,"name");P();}
+void t7(){T(title_includes_version);C(ApiaryBrowserPanelModel::title(tools()[0]).find("1.0")!=std::string::npos,"version");P();}
+void t8(){T(source_path_is_preserved);C(tools()[1].sourcePath.find("drone.rs")!=std::string::npos,"source");P();}
+void t9(){T(language_field_available);C(tools()[2].language=="python","lang");P();}
+void t10(){T(doc_summary_field_available);C(tools()[0].docSummary=="nexus tool","doc");P();}
+void t11(){T(capability_match_is_exact);auto r=ApiaryBrowserPanelModel::filterByCapability(tools(),"job");C(r.empty(),"exact");P();}
+void t12(){T(filter_handles_single_entry);std::vector<ApiaryToolEntry> one={tools()[0]};auto r=ApiaryBrowserPanelModel::filterByCapability(one,"db");C(r.size()==1,"single");P();}
+
+int main(){std::cout<<"Step 656: Apiary browser panel\n";t1();t2();t3();t4();t5();t6();t7();t8();t9();t10();t11();t12();std::cout<<"\nResults: "<<p<<"/"<<(p+f)<<" passed\n";return f?1:0;}
diff --git a/progress.md b/progress.md
index 3c919c8..f5567d2 100644
--- a/progress.md
+++ b/progress.md
@@ -13504,3 +13504,27 @@ counts and per-job display formatting.
 - `editor/src/SwarmStatusPanelModel.h` (`46` <= `600`)
 - `editor/tests/step655_test.cpp` within test-file size guidance (`27` lines)
 - Header-only architecture and naming conventions remain aligned with `ARCHITECTURE.md`
+
+### Step 656: Apiary browser panel
+**Status:** PASS (12/12 tests)
+
+Adds apiary browser panel modeling for tool listing, capability filtering, and
+tool title/source metadata presentation.
+
+**Files added:**
+- `editor/src/ApiaryBrowserPanelModel.h` - apiary panel model
+- `editor/tests/step656_test.cpp` - 12 tests for filtering and metadata behavior
+
+**Files modified:**
+- `editor/CMakeLists.txt` - `step656_test` target
+
+**Verification run:**
+- `cmake -S editor -B editor/build-native` - PASS
+- `cmake --build editor/build-native --target step656_test step655_test` - PASS
+- `./editor/build-native/step656_test` - PASS (12/12)
+- `./editor/build-native/step655_test` - PASS (12/12) regression coverage
+
+**Architecture gate check:**
+- `editor/src/ApiaryBrowserPanelModel.h` (`36` <= `600`)
+- `editor/tests/step656_test.cpp` within test-file size guidance (`29` lines)
+- Header-only architecture and naming conventions remain aligned with `ARCHITECTURE.md`