Redesign graph viewer navigation

docs/CONTRACT.md

@@ -23,7 +23,7 @@ approved contract and measured cross-project evidence; it is not an unimplemente
 - Result envelope: `schemas/result.schema.json`, version 1.
 - Changeset schema: `schemas/changeset.schema.json`, version 1.
 - Index schema: version 1, disposable and reproducible.
-- Core, CLI, and MCP server: version 0.8.2.
+- Core, CLI, and MCP server: version 0.9.0.
 
 Schema files describe the generic interchange contract. Runtime validation remains responsible for
 path confinement, source hashing, relationship resolution, dependency cycles, project limits, stale
@@ -101,25 +101,35 @@ The HTTP listener binds to `127.0.0.1` on an operating-system-selected port. A c
 random token is part of every accepted URL path. Only `GET` and `HEAD` are supported. Responses use
 no-store caching, a restrictive content-security policy, frame denial, MIME sniffing protection,
 and no-referrer policy. The built-in template uses only same-origin JSON endpoints for graph
-overview, bounded search, exact node content, bounded incoming-and-outgoing neighborhoods, and one
+overview, bounded search, exact descriptor-category filtering, exact node content, bounded
-lease heartbeat. The heartbeat changes no project or index state. There is no write endpoint,
+incoming-and-outgoing neighborhoods, and one lease heartbeat. Descriptor filtering accepts only
-arbitrary query endpoint, static filesystem handler, external asset, or project-selection control.
+family, authority, status, or tag plus one exact value. The heartbeat changes no project or index
+state. There is no write endpoint, arbitrary query endpoint, static filesystem handler, external
+asset, or project-selection control.
 
-The `graph-browser@6` template provides mouse-wheel zoom centered on the pointer, left-button drag
+The `graph-browser@7` template provides mouse-wheel zoom centered on the pointer, left-button drag
 pan, explicit zoom-in and zoom-out buttons, a reset-view button, and a live zoom percentage. A
 four-pixel drag threshold defers pointer capture and preserves node activation for ordinary clicks.
 Loading another root node fits the viewport to the returned neighborhood, including a useful
 minimum scale for a single-node result. The current root begins selected, and activating another
 graph node moves the visible selection ring to it. Space centers the viewport on the selected node
 without changing zoom. Reset restores the fitted neighborhood view. Empty-canvas guidance is hidden
-whenever a neighborhood is rendered.
+whenever a neighborhood is rendered. The page is fixed to the browser viewport. Search and exact
+filter results fill the left panel, neighborhood traversal fills the right panel, and only the
+center SVG canvas pans or zooms.
 
-Activating a graph node opens a modal inspector containing that node's complete validated metadata
+Left-clicking or pressing Enter on a graph node opens a compact descriptor card containing the
-and content. Inspection does not replace the current neighborhood or reset the viewport. The modal
+validated metadata and content previously shown in the details panel. Its family, authority,
-supports keyboard activation, Escape, explicit close controls, and backdrop dismissal. Loading the
+status, and tag pills are buttons that replace the left result list with exact matching nodes.
-inspected node as the new root requires the separate Explore neighborhood action. Both side panels
+Right-clicking or pressing Shift+Enter opens the complete inspector. Inspection does not replace
-support pointer and keyboard resizing. The unblurred modal supports native resizing and constrained
+the current neighborhood or reset the viewport. Both dialogs support Escape, explicit close
-title-bar dragging.
+controls, and backdrop dismissal. Loading the inspected node as the new root requires the separate
+Explore neighborhood action. Both side panels support pointer and keyboard resizing. The unblurred
+full inspector supports native resizing and constrained title-bar dragging.
+
+The header exposes a Nodes/Flow segmented selector. Both positions intentionally retain the node
+graph in this contract version. Flow traversal and layout semantics remain unclaimed until relation
+direction and eligibility are defined.
 
 The browser derives presentation roles only from the returned bounded graph. The current root is
 the primary focus. Nodes reachable through outgoing edges are children. Remaining incoming and

docs/MCP_CONTRACT.md

@@ -61,22 +61,25 @@ only through the explicit local CLI integration command.
 
 ## Visualization boundary
 
-`docforge_visualize` starts the fixed built-in `graph-browser@6` template against the currently
+`docforge_visualize` starts the fixed built-in `graph-browser@7` template against the currently
 validated derived index. It may focus one stable node, run one bounded lexical query, or open the
 project overview. The tool returns a loopback URL and exact snapshot identity.
 
 The tool cannot select a project, database, template, host, port, filesystem path, or SQL
 expression. Its HTTP surface is token-bound, read-only, same-origin, and limited to overview,
-search/filter, node-neighborhood JSON, and a read-only browser-lease heartbeat. The browser exposes
+search, exact family/authority/status/tag filtering, node-neighborhood JSON, and a read-only
-an exact validated index snapshot. It rejects index replacement or alteration and requires another
+browser-lease heartbeat. The browser exposes an exact validated index snapshot. It rejects index
-MCP invocation to refresh.
+replacement or alteration and requires another MCP invocation to refresh.
 Viewport interaction is entirely client-side: fitted neighborhood framing, wheel zoom, left-button
 drag pan, explicit zoom buttons, reset, and Space-to-center selection never request or mutate
-project data. Graph-node activation visibly selects the node, fetches exact node data from the same
+project data. Left activation visibly selects the node and opens a compact descriptor card.
-bounded read endpoint, and opens a client-side modal inspector. Replacing the current root requires
+Right-click opens the full inspector. Descriptor-pill activation fills the fixed left panel with an
-the modal's explicit Explore neighborhood action. The open browser renews a bounded lease in a
+exact bounded category result set. The fixed right panel contains neighborhood navigation.
-detached local worker, so standard-input transaction completion does not close the listener. The
+Replacing the current root requires an explicit Explore neighborhood action. The Nodes/Flow
-worker tracks the longer-lived MCP client host and closes when that owner exits.
+selector retains the same graph until a later contract defines flow semantics. The open browser
+renews a bounded lease in a detached local worker, so standard-input transaction completion does
+not close the listener. The worker tracks the longer-lived MCP client host and closes when that
+owner exits.
 Explicit service shutdown closes its tracked worker, and abandoned pages expire.
 
 ## Excluded tools

docs/NEW_PROJECT_QUICKSTART.md

@@ -16,11 +16,12 @@ The DocForge repository contains the complete generic CLI and stdio MCP server.
 
 - Project identity, validation, exact-node retrieval, lexical search, and filtering.
 - Backlinks, dependency traversal, impact traversal, and bounded context profiles.
-- `docforge_visualize`, which starts the token-protected, loopback-only `graph-browser@6` viewer.
+- `docforge_visualize`, which starts the token-protected, loopback-only `graph-browser@7` viewer.
   The viewer supports search, family filtering, exact-node inspection, bounded neighborhoods,
-  modal inspection without losing the current neighborhood, explicit neighborhood exploration,
+  exact descriptor-pill filtering, compact left-click descriptors, full right-click inspection,
-  fitted single- and multi-node framing, visible node selection, Space-to-center, mouse-wheel zoom,
+  fixed search and neighborhood side panels, explicit neighborhood exploration, fitted single- and
-  left-button drag panning, zoom controls, and viewport reset.
+  multi-node framing, visible node selection, Space-to-center, mouse-wheel zoom, left-button drag
+  panning, zoom controls, viewport reset, and a reserved Nodes/Flow selector.
 - Isolated documentation changesets, proposal validation, diffs, and escaped HTML previews when a
   proposal writer and render view are configured.
 

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "docforge"
-version = "0.8.2"
+version = "0.9.0"
 description = "Project-scoped documentation indexing and context service"
 readme = "README.md"
 requires-python = ">=3.12"

src/docforge/visualization.py

@@ -23,7 +23,7 @@ from typing import cast
 from .errors import DocForgeError
 from .index import APPLICATION_ID, INDEX_SCHEMA_VERSION, ProjectIndex, re_tokenize
 
-VISUALIZATION_TEMPLATE = "graph-browser@6"
+VISUALIZATION_TEMPLATE = "graph-browser@7"
 DEFAULT_EDGE_LIMIT = 100
 MAX_EDGE_LIMIT = 400
 DEFAULT_INITIAL_GRACE_SECONDS = 120.0
@@ -167,6 +167,42 @@ class VisualizationIndexSnapshot:
             snapshot=True,
         )
 
+    def filter_nodes(
+        self,
+        *,
+        category: str,
+        value: str,
+        limit: int,
+    ) -> dict[str, object]:
+        bounded = self._bounded_limit(limit)
+        if category not in {"family", "authority", "status", "tag"}:
+            raise DocForgeError("invalid_filter", "Descriptor filter category is unsupported")
+        if not value or len(value) > self.max_query_chars:
+            raise DocForgeError("invalid_filter", "Descriptor filter value is invalid")
+        if category == "tag":
+            clause = "EXISTS (SELECT 1 FROM json_each(tags_json) WHERE value = ?)"
+        else:
+            clause = f"{category} = ?"
+        with self._connection() as connection:
+            total = connection.execute(
+                f"SELECT COUNT(*) FROM nodes WHERE {clause}",
+                (value,),
+            ).fetchone()[0]
+            rows = connection.execute(
+                f"SELECT * FROM nodes WHERE {clause} ORDER BY node_id LIMIT ?",
+                (value, bounded),
+            ).fetchall()
+        results = [_node_dict(row, include_content=False) for row in rows]
+        return self._result(
+            category=category,
+            value=value,
+            count=len(results),
+            total=total,
+            truncated=total > len(results),
+            results=results,
+            snapshot=True,
+        )
+
     def node(self, node_id: str, *, depth: int, limit: int) -> dict[str, object]:
         if type(depth) is not int or depth < 1 or depth > self.max_depth:
             raise DocForgeError("invalid_depth", "Traversal depth is outside the configured limit")
@@ -539,6 +575,8 @@ class VisualizationRunner:
                 )
             elif parsed.path == f"{prefix}/api/search":
                 payload = self._search(reader, params)
+            elif parsed.path == f"{prefix}/api/filter":
+                payload = self._filter(reader, params)
             elif parsed.path == f"{prefix}/api/node":
                 payload = self._node(reader, params)
             else:
@@ -558,6 +596,7 @@ class VisualizationRunner:
                 "stale_adapter_source": HTTPStatus.CONFLICT,
                 "visualization_stale": HTTPStatus.CONFLICT,
                 "invalid_query": HTTPStatus.BAD_REQUEST,
+                "invalid_filter": HTTPStatus.BAD_REQUEST,
                 "invalid_depth": HTTPStatus.BAD_REQUEST,
                 "invalid_limit": HTTPStatus.BAD_REQUEST,
             }.get(error.code, HTTPStatus.SERVICE_UNAVAILABLE)
@@ -607,6 +646,16 @@ class VisualizationRunner:
             )
         return reader.node(node_id, depth=depth, limit=limit)
 
+    def _filter(
+        self,
+        reader: VisualizationIndexSnapshot,
+        params: dict[str, list[str]],
+    ) -> dict[str, object]:
+        category = _one(params, "category").strip()
+        value = _one(params, "value").strip()
+        limit = _integer(_one(params, "limit") or "50")
+        return reader.filter_nodes(category=category, value=value, limit=limit)
+
     def _current_reader(self) -> VisualizationIndexSnapshot:
         with self._lock:
             reader = self._reader
@@ -864,6 +913,7 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>DocForge graph</title>
+  <link rel="icon" href="data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22/%3E">
   <style>
     :root {
       color-scheme: dark;
@@ -887,23 +937,43 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       font: 14px/1.45 Inter, ui-sans-serif, system-ui, sans-serif;
     }
     * { box-sizing: border-box; }
-    body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); }
+    html, body { height: 100%; overflow: hidden; }
+    body { margin: 0; background: var(--bg); color: var(--text); }
     button, input, select { font: inherit; }
     button { cursor: pointer; }
     code, pre { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
-    .app { display: grid; grid-template-rows: auto 1fr; min-height: 100vh; }
+    .app { display: grid; grid-template-rows: auto minmax(0, 1fr); height: 100dvh; }
     header {
-      display: flex; gap: 18px; align-items: center; padding: 14px 18px;
+      display: flex; gap: 14px; align-items: center; padding: 10px 14px;
       border-bottom: 1px solid var(--line); background: rgba(8, 18, 30, .96);
     }
     header h1 { margin: 0; font-size: 17px; }
+    .view-switch {
+      position: relative; display: grid; grid-template-columns: repeat(2, 58px);
+      flex: 0 0 auto; padding: 3px; border: 1px solid var(--line); border-radius: 9px;
+      background: #08131f; isolation: isolate;
+    }
+    .view-switch::before {
+      content: ""; position: absolute; z-index: -1; top: 3px; left: 3px;
+      width: 58px; height: calc(100% - 6px); border-radius: 6px;
+      background: #1b536b; box-shadow: 0 0 14px rgba(81, 215, 255, .18);
+      transition: transform .18s ease;
+    }
+    .view-switch[data-mode="flow"]::before { transform: translateX(58px); }
+    .view-switch button {
+      min-height: 30px; border: 0; border-radius: 6px; padding: 4px 8px;
+      background: transparent; color: var(--muted); font-size: 12px; font-weight: 700;
+    }
+    .view-switch button[aria-pressed="true"] { color: var(--text); }
+    .view-switch button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
     .stats { display: flex; gap: 14px; color: var(--muted); }
     .status { margin-left: auto; color: var(--muted); }
     .layout {
-      min-height: 0; display: grid;
+      min-height: 0; overflow: hidden; display: grid;
       grid-template-columns: var(--left-width) 7px minmax(360px, 1fr) 7px var(--right-width);
     }
-    aside { min-height: 0; overflow: auto; padding: 16px; background: var(--panel); }
+    aside { min-height: 0; overflow: hidden; padding: 16px; background: var(--panel); }
+    .left, .right { display: flex; flex-direction: column; }
     .panel-resizer {
       position: relative; z-index: 4; min-height: 0; background: #0a1521;
       cursor: col-resize; touch-action: none;
@@ -915,7 +985,7 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
     .panel-resizer:hover::after, .panel-resizer:focus-visible::after,
     .panel-resizer.resizing::after { background: var(--accent); }
     .panel-resizer:focus-visible { outline: 1px solid var(--accent); outline-offset: -1px; }
-    form { display: grid; gap: 8px; }
+    form { display: grid; flex: 0 0 auto; gap: 8px; }
     input, select {
       width: 100%; border: 1px solid var(--line); border-radius: 8px;
       padding: 9px 10px; background: var(--panel-2); color: var(--text);
@@ -925,7 +995,22 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       border: 1px solid #277fa0; border-radius: 8px; padding: 8px 12px;
       background: #12384a; color: var(--text);
     }
-    .results { display: grid; gap: 7px; margin-top: 14px; }
+    .results-context {
+      display: flex; align-items: center; justify-content: space-between; gap: 8px;
+      min-height: 30px; margin-top: 12px; color: var(--muted); font-size: 11px;
+    }
+    .results-context strong {
+      overflow: hidden; color: var(--text); text-overflow: ellipsis; white-space: nowrap;
+    }
+    #clear-result-filter {
+      flex: 0 0 auto; border: 1px solid var(--line); border-radius: 6px; padding: 3px 7px;
+      background: var(--panel-2); color: var(--muted); font-size: 11px;
+    }
+    #clear-result-filter[hidden] { display: none; }
+    .results {
+      display: grid; align-content: start; gap: 7px; min-height: 0;
+      margin-top: 8px; overflow: auto; padding-right: 2px;
+    }
     .section-label {
       display: flex; align-items: center; justify-content: space-between; gap: 8px;
       margin: 18px 0 8px; color: var(--muted); font-size: 11px;
@@ -935,7 +1020,12 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       min-width: 24px; border: 1px solid var(--line); border-radius: 999px;
       padding: 1px 6px; text-align: center; letter-spacing: 0;
     }
-    .neighborhood { margin-top: 18px; padding-top: 2px; border-top: 1px solid var(--line); }
+    .neighborhood {
+      display: flex; flex: 1; flex-direction: column; min-height: 0;
+    }
+    .neighborhood[hidden] { display: none; }
+    .neighborhood-title { margin: 0; font-size: 15px; }
+    #neighborhood-sections { min-height: 0; overflow: auto; padding-right: 2px; }
     .node-list { display: grid; gap: 6px; }
     .node-list-item {
       width: 100%; display: grid; grid-template-columns: 8px minmax(0, 1fr);
@@ -957,7 +1047,8 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
     }
     .node-list-copy span { color: var(--muted); font-size: 11px; }
     .legend {
-      display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 14px;
+      display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 12px;
+      padding-bottom: 4px;
     }
     .legend span {
       display: flex; align-items: center; gap: 5px; color: var(--muted); font-size: 10px;
@@ -973,8 +1064,8 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
     .result:hover, .result:focus { border-color: var(--accent); }
     .result strong, .result span { display: block; overflow: hidden; text-overflow: ellipsis; }
     .result span { color: var(--muted); font-size: 12px; white-space: nowrap; }
-    .canvas { position: relative; min-height: 0; overflow: hidden; }
+    .canvas { position: relative; min-width: 0; min-height: 0; overflow: hidden; }
-    svg { width: 100%; height: 100%; min-height: 620px; background:
+    svg { width: 100%; height: 100%; background:
       radial-gradient(circle at center, #10243a 0, #07101a 64%);
       cursor: grab; touch-action: none; user-select: none;
     }
@@ -1046,6 +1137,10 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       display: inline-block; margin: 4px 5px 0 0; border: 1px solid var(--line);
       border-radius: 999px; padding: 3px 7px; color: var(--muted); font-size: 11px;
     }
+    .badge-button { background: #0d2031; }
+    .badge-button:hover, .badge-button:focus-visible {
+      border-color: var(--accent); color: var(--text); outline: none;
+    }
     .meta { display: grid; gap: 8px; margin: 14px 0; }
     .meta div { display: grid; grid-template-columns: 82px 1fr; gap: 8px; }
     .meta dt { color: var(--muted); }
@@ -1083,28 +1178,43 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
     }
     .dialog-body { min-height: 0; overflow: auto; padding: 18px; }
     .dialog-body pre { max-height: none; }
+    dialog.compact-dialog {
+      width: min(520px, calc(100vw - 32px)); height: min(620px, calc(100vh - 32px));
+      resize: none;
+    }
+    .compact-dialog .dialog-head { cursor: default; }
+    .compact-dialog .dialog-body { padding: 16px; }
+    .compact-dialog .dialog-body pre { max-height: 230px; }
     .dialog-actions {
       display: flex; justify-content: flex-end; gap: 8px; padding: 12px 16px;
       border-top: 1px solid var(--line); background: var(--panel-2);
     }
     .error { color: #ff9aac; }
     @media (max-width: 980px) {
-      .layout { grid-template-columns: 240px 1fr; }
+      :root { --left-width: 240px; --right-width: 260px; }
-      .panel-resizer { display: none; }
+      .layout {
-      .right { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--line); }
+        grid-template-columns: var(--left-width) 7px minmax(280px, 1fr) 7px var(--right-width);
+      }
+      .stats { display: none; }
+    }
+    @media (max-width: 760px) {
+      :root { --left-width: 220px; --right-width: 240px; }
+      header h1 { font-size: 14px; }
+      .status { display: none; }
+      .layout {
+        grid-template-columns: var(--left-width) 5px minmax(240px, 1fr) 5px var(--right-width);
       }
-    @media (max-width: 700px) {
-      .layout { display: block; }
-      aside { max-height: none; }
-      svg { min-height: 520px; }
-      header { flex-wrap: wrap; }
-      .status { width: 100%; margin-left: 0; }
     }
   </style>
 </head>
 <body>
   <div class="app">
     <header>
+      <div class="view-switch" id="view-switch" data-mode="nodes"
+           role="group" aria-label="Graph view">
+        <button id="view-nodes" type="button" aria-pressed="true">Nodes</button>
+        <button id="view-flow" type="button" aria-pressed="false">Flow</button>
+      </div>
       <h1 id="project-title">DocForge graph</h1>
       <div class="stats">
         <span><strong id="node-count">—</strong> nodes</span>
@@ -1124,15 +1234,11 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
           <label for="family">Family</label>
           <select id="family" name="family"><option value="">All families</option></select>
         </form>
+        <div class="results-context">
+          <strong id="results-label">All nodes</strong>
+          <button id="clear-result-filter" type="button" hidden>Clear filter</button>
+        </div>
         <div class="results" id="results"></div>
-        <div class="neighborhood" id="neighborhood" hidden>
-          <div class="legend" role="group" aria-label="Node role colors">
-            <span class="legend-primary"><i></i>Primary</span>
-            <span class="legend-child"><i></i>Children</span>
-            <span class="legend-edge"><i></i>Edge</span>
-          </div>
-          <div id="neighborhood-sections"></div>
-        </div>
       </aside>
       <div class="panel-resizer" id="left-resizer" role="separator" tabindex="0"
            aria-label="Resize navigation panel" aria-orientation="vertical"
@@ -1155,15 +1261,21 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
           <span>The project-bound listener is unavailable. Invoke docforge_visualize again.</span>
         </div>
         <div class="viewport-hint">
-          Click node to inspect · Space centers selection · mouse wheel zooms · left-drag pans
+          Left-click descriptor · right-click full inspector · Space centers selection
         </div>
       </main>
       <div class="panel-resizer" id="right-resizer" role="separator" tabindex="0"
-           aria-label="Resize details panel" aria-orientation="vertical"
+           aria-label="Resize neighborhood panel" aria-orientation="vertical"
            aria-valuemin="240" aria-valuemax="900" aria-valuenow="350"></div>
-      <aside class="right" aria-label="Node details">
+      <aside class="right" aria-label="Neighborhood navigation">
-        <div id="details">
+        <div class="neighborhood" id="neighborhood" hidden>
-          <p class="summary">Choose a search result to load its neighborhood.</p>
+          <h2 class="neighborhood-title">Neighborhood</h2>
+          <div class="legend" role="group" aria-label="Node role colors">
+            <span class="legend-primary"><i></i>Primary</span>
+            <span class="legend-child"><i></i>Children</span>
+            <span class="legend-edge"><i></i>Edge</span>
+          </div>
+          <div id="neighborhood-sections"></div>
         </div>
       </aside>
     </div>
@@ -1182,6 +1294,20 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       </div>
     </div>
   </dialog>
+  <dialog class="compact-dialog" id="node-card" aria-labelledby="node-card-label">
+    <div class="dialog-shell">
+      <div class="dialog-head">
+        <strong id="node-card-label">Node descriptor</strong>
+        <button class="dialog-close" id="close-node-card" type="button"
+                aria-label="Close node descriptor">×</button>
+      </div>
+      <div class="dialog-body" id="node-card-details"></div>
+      <div class="dialog-actions">
+        <button class="button" id="explore-card-node" type="button">Explore neighborhood</button>
+        <button class="button" id="dismiss-node-card" type="button">Close</button>
+      </div>
+    </div>
+  </dialog>
   <script>
     const base = location.pathname.replace(/\/?$/, "/");
     const defaultViewport = Object.freeze({x: -600, y: -410, width: 1200, height: 820});
@@ -1189,6 +1315,7 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       overview: null,
       graph: null,
       root: null,
+      mode: "nodes",
       depth: 1,
       searchLimit: 1,
       viewport: {...defaultViewport},
@@ -1198,6 +1325,7 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       pointer: null,
       suppressClick: false,
       inspectedNode: null,
+      cardNode: null,
       dialogDrag: null,
       leaseTimer: null,
     };
@@ -1361,6 +1489,10 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
         results.append(button);
       }
     }
+    function setResultsContext(label, filtered = false) {
+      $("results-label").textContent = label;
+      $("clear-result-filter").hidden = !filtered;
+    }
     function analyzeTopology(data) {
       const nodeIds = new Set(data.nodes.map((node) => node.node_id));
       const adjacency = new Map([...nodeIds].map((nodeId) => [nodeId, new Set()]));
@@ -1590,21 +1722,27 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
         group.addEventListener("click", () => {
           if (!state.suppressClick) {
             selectNode(node.node_id);
-            inspectNode(node.node_id);
+            showNodeCard(node.node_id);
           }
         });
+        group.addEventListener("contextmenu", (event) => {
+          event.preventDefault();
+          selectNode(node.node_id);
+          inspectNode(node.node_id);
+        });
         group.addEventListener("keydown", (event) => {
           if (event.key === "Enter") {
             event.preventDefault();
             selectNode(node.node_id);
-            inspectNode(node.node_id);
+            if (event.shiftKey) inspectNode(node.node_id);
+            else showNodeCard(node.node_id);
           }
         });
         nodeLayer.append(group);
       }
       svg.append(edgeLayer, nodeLayer);
     }
-    function renderDetails(details, node, data) {
+    function renderDetails(details, node, data, interactiveBadges = false) {
       details.replaceChildren();
       const heading = document.createElement("div");
       heading.className = "detail-head";
@@ -1612,10 +1750,25 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       title.textContent = node.title;
       heading.append(title);
       const badges = document.createElement("div");
-      for (const value of [node.family, node.authority, node.status, ...node.tags]) {
+      const descriptors = [
-        const badge = document.createElement("span");
+        {category: "family", value: node.family},
+        {category: "authority", value: node.authority},
+        {category: "status", value: node.status},
+        ...node.tags.map((value) => ({category: "tag", value})),
+      ];
+      for (const descriptor of descriptors) {
+        const badge = document.createElement(interactiveBadges ? "button" : "span");
+        if (interactiveBadges) {
+          badge.type = "button";
+          badge.className = "badge badge-button";
+          badge.title = `Show nodes with ${descriptor.category} ${descriptor.value}`;
+          badge.addEventListener("click", () => {
+            filterByDescriptor(descriptor.category, descriptor.value);
+          });
+        } else {
           badge.className = "badge";
-        badge.textContent = value;
+        }
+        badge.textContent = descriptor.value;
         badges.append(badge);
       }
       const summary = document.createElement("p");
@@ -1646,6 +1799,28 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       if (dialog.open) dialog.close();
       else state.inspectedNode = null;
     }
+    function closeNodeCard() {
+      const dialog = $("node-card");
+      if (dialog.open) dialog.close();
+      else state.cardNode = null;
+    }
+    async function showNodeCard(nodeId) {
+      try {
+        selectNode(nodeId);
+        setStatus(`Loading descriptor for ${nodeId}…`);
+        const params = new URLSearchParams({id: nodeId, depth: String(state.depth), limit: "100"});
+        const data = await api(`node?${params}`);
+        state.cardNode = nodeId;
+        renderDetails($("node-card-details"), data.node, data, true);
+        $("node-card-label").textContent = short(data.node.title, 72);
+        const dialog = $("node-card");
+        if (!dialog.open) dialog.showModal();
+        $("close-node-card").focus();
+        setStatus(`Selected ${nodeId}`);
+      } catch (error) {
+        setStatus(error.message, true);
+      }
+    }
     async function inspectNode(nodeId) {
       try {
         selectNode(nodeId);
@@ -1673,24 +1848,54 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
         setStatus("Searching validated index…");
         const data = await api(`search?${params}`);
         renderResults(data.results || []);
+        setResultsContext(
+          $("search").value.trim() || $("family").value
+            ? `${data.count} search results`
+            : "All nodes",
+        );
         setStatus(`${data.count} matching node${data.count === 1 ? "" : "s"}`);
       } catch (error) {
         setStatus(error.message, true);
       }
     }
+    async function filterByDescriptor(category, value) {
+      const params = new URLSearchParams({
+        category,
+        value,
+        limit: String(state.searchLimit),
+      });
+      try {
+        closeNodeCard();
+        setStatus(`Filtering ${category} ${value}…`);
+        const data = await api(`filter?${params}`);
+        $("search").value = "";
+        $("family").value = category === "family" ? value : "";
+        renderResults(data.results || []);
+        setResultsContext(`${category}: ${value} (${data.total})`, true);
+        const suffix = data.truncated ? ` · showing first ${data.count}` : "";
+        setStatus(`${data.total} nodes assigned ${category} ${value}${suffix}`);
+      } catch (error) {
+        setStatus(error.message, true);
+      }
+    }
     async function loadNode(nodeId) {
       try {
         setStatus(`Loading ${nodeId}…`);
         const params = new URLSearchParams({id: nodeId, depth: String(state.depth), limit: "100"});
         const data = await api(`node?${params}`);
         renderGraph(data);
-        renderDetails($("details"), data.node, data);
         setStatus(`${data.nodes.length} nodes · ${data.edges.length} edges in neighborhood`);
         history.replaceState(null, "", `?node=${encodeURIComponent(nodeId)}&depth=${state.depth}`);
       } catch (error) {
         setStatus(error.message, true);
       }
     }
+    function setViewMode(mode) {
+      state.mode = mode;
+      $("view-switch").dataset.mode = mode;
+      $("view-nodes").setAttribute("aria-pressed", String(mode === "nodes"));
+      $("view-flow").setAttribute("aria-pressed", String(mode === "flow"));
+    }
     function clamp(value, minimum, maximum) {
       return Math.min(maximum, Math.max(minimum, value));
     }
@@ -1777,11 +1982,20 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
     }
     $("search-form").addEventListener("submit", (event) => { event.preventDefault(); search(); });
     $("family").addEventListener("change", search);
+    $("clear-result-filter").addEventListener("click", () => {
+      $("search").value = "";
+      $("family").value = "";
+      search();
+    });
+    $("view-nodes").addEventListener("click", () => setViewMode("nodes"));
+    $("view-flow").addEventListener("click", () => setViewMode("flow"));
     $("zoom-in").addEventListener("click", () => zoomAt(.8));
     $("zoom-out").addEventListener("click", () => zoomAt(1.25));
     $("reset-view").addEventListener("click", resetViewport);
     $("close-node-dialog").addEventListener("click", closeNodeDialog);
     $("dismiss-node-dialog").addEventListener("click", closeNodeDialog);
+    $("close-node-card").addEventListener("click", closeNodeCard);
+    $("dismiss-node-card").addEventListener("click", closeNodeCard);
     setupPanelResizer("left");
     setupPanelResizer("right");
     $("node-dialog").querySelector(".dialog-head").addEventListener("pointerdown", beginDialogDrag);
@@ -1793,6 +2007,11 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
       closeNodeDialog();
       if (nodeId) await loadNode(nodeId);
     });
+    $("explore-card-node").addEventListener("click", async () => {
+      const nodeId = state.cardNode;
+      closeNodeCard();
+      if (nodeId) await loadNode(nodeId);
+    });
     $("node-dialog").addEventListener("click", (event) => {
       if (event.target !== $("node-dialog")) return;
       const bounds = $("node-dialog").getBoundingClientRect();
@@ -1808,8 +2027,26 @@ _GRAPH_BROWSER_HTML = r"""<!DOCTYPE html>
         setStatus(`${nodeCount} nodes · ${edgeCount} edges in neighborhood`);
       }
     });
+    $("node-card").addEventListener("click", (event) => {
+      if (event.target !== $("node-card")) return;
+      const bounds = $("node-card").getBoundingClientRect();
+      const inside = event.clientX >= bounds.left && event.clientX <= bounds.right
+        && event.clientY >= bounds.top && event.clientY <= bounds.bottom;
+      if (!inside) closeNodeCard();
+    });
+    $("node-card").addEventListener("close", () => {
+      state.cardNode = null;
+      if (state.graph) {
+        const nodeCount = state.graph.nodes.length;
+        const edgeCount = state.graph.edges.length;
+        setStatus(`${nodeCount} nodes · ${edgeCount} edges in neighborhood`);
+      }
+    });
     document.addEventListener("keydown", (event) => {
-      if (event.code !== "Space" || event.defaultPrevented || $("node-dialog").open) return;
+      if (event.code !== "Space" || event.defaultPrevented
+          || $("node-dialog").open || $("node-card").open) {
+        return;
+      }
       const target = event.target;
       if (target instanceof Element
           && target.closest("input, select, textarea, button, [contenteditable='true']")) {

tests/test_mcp_server.py

@@ -101,7 +101,7 @@ class DocForgeMcpTests(unittest.IsolatedAsyncioTestCase):
             visualization = results[11].structuredContent["visualization"]
             self.assertTrue(visualization["read_only"])
             self.assertTrue(visualization["project_bound"])
-            self.assertEqual("graph-browser@6", visualization["template"])
+            self.assertEqual("graph-browser@7", visualization["template"])
             self.assertEqual("browser_lease", visualization["lifetime"]["policy"])
             self.assertTrue(visualization["url"].startswith("http://127.0.0.1:"))
             context = results[8].structuredContent

tests/test_visualization.py

@@ -42,6 +42,7 @@ class VisualizationTests(unittest.TestCase):
             overview = snapshot.overview()
             first = snapshot.node("guide.workflow", depth=2, limit=2)
             second = snapshot.node("guide.workflow", depth=2, limit=2)
+            filtered = snapshot.filter_nodes(category="tag", value="canonical", limit=2)
 
             self.assertEqual(3, overview["node_count"])
             self.assertEqual(2, overview["edge_count"])
@@ -54,6 +55,10 @@ class VisualizationTests(unittest.TestCase):
             )
             self.assertEqual(first, second)
             self.assertEqual("guide.workflow", first["root"])
+            self.assertEqual(1, filtered["count"])
+            self.assertEqual(1, filtered["total"])
+            self.assertFalse(filtered["truncated"])
+            self.assertEqual("guide.foundation", filtered["results"][0]["node_id"])
             self.assertLessEqual(len(first["edges"]), 2)
             self.assertIn(
                 "guide.workflow",
@@ -62,6 +67,8 @@ class VisualizationTests(unittest.TestCase):
 
             with self.assertRaisesRegex(DocForgeError, "safety boundary"):
                 snapshot.node("guide.workflow", depth=1, limit=401)
+            with self.assertRaisesRegex(DocForgeError, "category is unsupported"):
+                snapshot.filter_nodes(category="relation", value="depends_on", limit=2)
 
     @unittest.skipUnless(shutil.which("node"), "Node.js is required for embedded script validation")
     def test_embedded_browser_javascript_is_valid(self) -> None:
@@ -173,17 +180,25 @@ if (centered.y !== positions.get("child-two").y - 150) fail("center y");
                 self.assertIn('id="zoom-out"', html)
                 self.assertIn('id="reset-view"', html)
                 self.assertIn('id="node-dialog"', html)
+                self.assertIn('id="node-card"', html)
                 self.assertIn('id="explore-node"', html)
+                self.assertIn('id="explore-card-node"', html)
                 self.assertIn('id="left-resizer"', html)
                 self.assertIn('id="right-resizer"', html)
+                self.assertIn('id="view-nodes"', html)
+                self.assertIn('id="view-flow"', html)
                 self.assertIn('id="neighborhood-sections"', html)
+                self.assertNotIn('id="details"', html)
                 self.assertIn(".empty[hidden] { display: none; }", html)
+                self.assertIn("html, body { height: 100%; overflow: hidden; }", html)
                 self.assertIn("Space centers selection", html)
                 self.assertIn("resize: both", html)
                 self.assertNotIn("backdrop-filter", html)
                 self.assertIn('addEventListener("wheel"', html)
                 self.assertIn('addEventListener("pointermove"', html)
                 self.assertIn("inspectNode(node.node_id)", html)
+                self.assertIn("showNodeCard(node.node_id)", html)
+                self.assertIn('addEventListener("contextmenu"', html)
                 self.assertIn("dialog.showModal()", html)
                 self.assertIn("await loadNode(nodeId)", html)
                 self.assertIn("beginDialogDrag", html)
@@ -194,6 +209,9 @@ if (centered.y !== positions.get("child-two").y - 150) fail("center y");
                 self.assertIn("distanceShade", html)
                 self.assertIn("viewportForPositions", html)
                 self.assertIn("centerSelectedNode", html)
+                self.assertIn("filterByDescriptor", html)
+                self.assertIn("api(`filter?${params}`)", html)
+                self.assertIn('setViewMode("flow")', html)
                 self.assertIn('event.code !== "Space"', html)
                 self.assertIn('class: "selection-ring"', html)
                 self.assertIn("renewViewerLease", html)
@@ -205,7 +223,7 @@ if (centered.y !== positions.get("child-two").y - 150) fail("center y");
                 )[0]
                 self.assertNotIn("setPointerCapture", pointerdown)
                 self.assertIn("setPointerCapture", pointermove)
-                self.assertIn("left-drag pans", html)
+                self.assertIn("right-click full inspector", html)
                 self.assertIn("default-src 'none'", headers["Content-Security-Policy"])
                 self.assertEqual("no-store", headers["Cache-Control"])
                 self.assertEqual("DENY", headers["X-Frame-Options"])
@@ -231,6 +249,19 @@ if (centered.y !== positions.get("child-two").y - 150) fail("center y");
                 self.assertEqual("alpha-docs", search["project_id"])
                 self.assertGreaterEqual(search["count"], 1)
 
+                filter_query = urllib.parse.urlencode(
+                    {"category": "tag", "value": "canonical", "limit": overview["max_results"]}
+                )
+                with urllib.request.urlopen(
+                    f"{base}api/filter?{filter_query}", timeout=2
+                ) as response:
+                    filtered = json.load(response)
+                self.assertEqual("alpha-docs", filtered["project_id"])
+                self.assertEqual("tag", filtered["category"])
+                self.assertEqual("canonical", filtered["value"])
+                self.assertEqual(1, filtered["total"])
+                self.assertEqual("guide.foundation", filtered["results"][0]["node_id"])
+
                 node_query = urllib.parse.urlencode(
                     {"id": "guide.workflow", "depth": 1, "limit": 20}
                 )

uv.lock

@@ -206,7 +206,7 @@ wheels = [
 
 [[package]]
 name = "docforge"
-version = "0.8.2"
+version = "0.9.0"
 source = { editable = "." }
 dependencies = [
     { name = "markdown-it-py" },