diff --git a/docs/observer/dashboard-core.js b/docs/observer/dashboard-core.js
index cf9cc9f0..305428d9 100644
--- a/docs/observer/dashboard-core.js
+++ b/docs/observer/dashboard-core.js
@@ -39,6 +39,74 @@ export function normalizeEpisode(raw) {
   };
 }
 
+// episode skill name → automation-graph node id (see tools/observer-known-nodes.txt
+// for the routable vocabulary; only skills that have a graph node are listed).
+export const SKILL_TO_NODE = {
+  brainstorming: 'sk_brainstorm',
+  'writing-plans': 'sk_wplans',
+  'executing-plans': 'sk_eplans',
+  'subagent-driven-development': 'sk_subagent',
+  'test-driven-development': 'sk_tdd',
+  'systematic-debugging': 'sk_debug',
+  'verification-before-completion': 'sk_verify',
+  'requesting-code-review': 'sk_coderev',
+  'using-git-worktrees': 'sk_worktree',
+  'finishing-a-development-branch': 'sk_pr',
+  'writing-skills': 'sk_wskills',
+  'discovery-interview': 'discovery_interview',
+  'audit-portal': 'sk_audit_portal',
+  regression: 'sk_regression',
+  'process-modeling': 'process_modeling',
+  'process-analysis': 'process_analysis',
+  ccpm: 'ccpm',
+  'security-review': 'sk_security_review',
+  'claude-md-management': 'claude_md_mgmt',
+};
+
+// mcp__<server>__<tool> → automation-graph node id.
+export const MCP_SERVER_TO_NODE = {
+  github: 'mcp_gh',
+  playwright: 'mcp_pw',
+  'laravel-boost': 'mcp_boost',
+  redis: 'mcp_redis',
+  sentry: 'mcp_sentry',
+  semgrep: 'mcp_semgrep',
+  openapi: 'mcp_openapi',
+  magic: 'mcp_21st',
+  'universal-icons': 'mcp_icons',
+};
+
+// "superpowers:systematic-debugging" → "systematic-debugging"
+function skillBase(name) {
+  const s = String(name || '');
+  return s.includes(':') ? s.split(':').pop() : s;
+}
+
+// Returns { nodeIds: string[], signals: number, attributed: number }.
+// A "signal" is an episode datum that names a routable node (a skill id or an
+// mcp__ tool). Builtin Claude tools are not signals.
+export function attributeNodes(episode) {
+  const ids = new Set();
+  let signals = 0;
+  let attributed = 0;
+  const consider = (nodeId) => {
+    signals++;
+    if (nodeId) {
+      ids.add(nodeId);
+      attributed++;
+    }
+  };
+  if (episode.nodeChosen && episode.nodeChosen !== 'direct') {
+    consider(SKILL_TO_NODE[skillBase(episode.nodeChosen)]);
+  }
+  for (const s of episode.skills) consider(SKILL_TO_NODE[skillBase(s)]);
+  for (const toolName of Object.keys(episode.tools)) {
+    const m = /^mcp__(.+?)__/.exec(toolName);
+    if (m) consider(MCP_SERVER_TO_NODE[m[1]]);
+  }
+  return { nodeIds: [...ids], signals, attributed };
+}
+
 export function parseEpisodes(text) {
   const episodes = [];
   let skipped = 0;
diff --git a/tools/brain-dashboard-core.test.mjs b/tools/brain-dashboard-core.test.mjs
index ab44977f..ceea5150 100644
--- a/tools/brain-dashboard-core.test.mjs
+++ b/tools/brain-dashboard-core.test.mjs
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { parseEpisodes, normalizeEpisode } from '../docs/observer/dashboard-core.js';
+import { parseEpisodes, normalizeEpisode, attributeNodes } from '../docs/observer/dashboard-core.js';
 
 const v1 = {
   task_id: 'a', timestamps: { started_at: '2026-05-19T05:18:16.342Z', ended_at: '2026-05-19T06:05:55.439Z' },
@@ -78,3 +78,35 @@ describe('normalizeEpisode', () => {
     expect(e.skills).toEqual(['superpowers:writing-plans', 'superpowers:test-driven-development']);
   });
 });
+
+describe('attributeNodes', () => {
+  const ep = (over) => normalizeEpisode({ ...v1, ...over });
+
+  it('maps node_chosen skill id to a graph node', () => {
+    const r = attributeNodes(ep({ primary_rationale: { node_chosen: 'superpowers:systematic-debugging', hard_floor: {} } }));
+    expect(r.nodeIds).toContain('sk_debug');
+  });
+
+  it('ignores node_chosen === "direct"', () => {
+    const r = attributeNodes(ep({ primary_rationale: { node_chosen: 'direct', hard_floor: {} } }));
+    expect(r.nodeIds).toEqual([]);
+  });
+
+  it('maps skill_invoked events to graph nodes', () => {
+    const r = attributeNodes(ep({ events: [{ kind: 'skill_invoked', skill: 'superpowers:writing-plans' }] }));
+    expect(r.nodeIds).toContain('sk_wplans');
+  });
+
+  it('maps mcp__<server>__ tool names to MCP graph nodes', () => {
+    const r = attributeNodes(ep({ events: [{ kind: 'tool_summary', counts: { 'mcp__github__get_issue': 2, 'mcp__laravel-boost__database-query': 1, Read: 4 } }] }));
+    expect(r.nodeIds).toContain('mcp_gh');
+    expect(r.nodeIds).toContain('mcp_boost');
+  });
+
+  it('counts signals vs attributed — builtin tools are not signals', () => {
+    const r = attributeNodes(ep({ events: [{ kind: 'tool_summary', counts: { Read: 1, 'mcp__github__x': 1 } }],
+      primary_rationale: { node_chosen: 'superpowers:test-driven-development', hard_floor: {} } }));
+    expect(r.attributed).toBe(2); // tdd skill + github mcp
+    expect(r.signals).toBe(2);    // only the tdd skill and the mcp tool count as signals
+  });
+});