diff --git a/packages/discord/README.md b/packages/discord/README.md
index d716e695..4703fa86 100644
--- a/packages/discord/README.md
+++ b/packages/discord/README.md
@@ -139,7 +139,7 @@ is `src/binding.mjs`.
 | `engine` | `provider`, `model`, `thinking` for pi |
 | `limits` | `turnsPerDay` (200), `turnTimeoutSeconds` (180), `replyChunkChars` (1900), `inboundMaxChars` (4000) |
 | `context.files[]` | files appended to pi's system prompt in order, repository-relative and inside the repository (no absolute paths, `..` or symlinks); the Discord block is added after them |
-| `tools` | optional. `roots[]` of `{name, path, write?, git?}`: absolute directories the seat may read through `list_dir`, `read_file` and `search`; a root with `"write": true` may also be written through `write_file` and `edit_file`; a writable root that is a git work tree may carry `git` `{branch, identity, tokenFile, author, protocol?}` and gains `git_status`, `git_commit`, `git_pull` and `git_push` (`protocol: "vault"` adds `reserve_id`); `maxFileBytes` (262144), `maxCallsPerTurn` (8); `web` (optional) `{searxng, maxFetchBytes}` enables `web_fetch` and `web_search` through the named SearXNG instance (https, or http on loopback; `maxFetchBytes` 1048576); `setspark` (optional) `{baseUrl, keyFile, principal?}` names the SetSpark record service (https origin, or http on loopback; key file absolute, 0600, read per call, never printed) and turns on connector-verified approvals. Absent means no tools and a pi launch with `--no-tools`. A root may not be `/`, the home directory, a symlink, a path with a dot-prefixed segment, or anything inside or above the data root |
+| `tools` | optional. `roots[]` of `{name, path, write?, git?}`: absolute directories the seat may read through `list_dir`, `read_file` and `search`; a root with `"write": true` may also be written through `write_file` and `edit_file`; a writable root that is a git work tree may carry `git` `{branch, identity, tokenFile, author, protocol?}` and gains `git_status`, `git_commit`, `git_pull` and `git_push` (`protocol: "vault"` adds `reserve_id`); `maxFileBytes` (262144), `maxCallsPerTurn` (8); `web` (optional) `{searxng, maxFetchBytes}` enables `web_fetch` and `web_search` through the named SearXNG instance (https, or http on loopback; `maxFetchBytes` 1048576); `setspark` (optional) `{baseUrl, keyFile, principal, timeoutMs?}` names the SetSpark record service (https origin, or http on loopback; key file absolute, 0600, read per call, never printed) and turns on connector-verified approvals. Absent means no tools and a pi launch with `--no-tools`. A root may not be `/`, the home directory, a symlink, a path with a dot-prefixed segment, or anything inside or above the data root |
 
 Unknown keys, missing fields, wrong types, empty allowlists, a user channel
 that is not listed and a bot listed as a user all refuse with exit 2. A
diff --git a/packages/discord/src/binding.mjs b/packages/discord/src/binding.mjs
index 587452fd..c9349b81 100644
--- a/packages/discord/src/binding.mjs
+++ b/packages/discord/src/binding.mjs
@@ -360,5 +360,8 @@ export function resolveToolRoots(binding, { dataRoot }) {
     if (real === data || real.startsWith(data + sep) || data.startsWith(real + sep)) throw new DiscordError(`tool root ${r.name} overlaps the data root: ${r.path}`);
     return { name: r.name, path: real, write: r.write, ...(r.git ? { git: { branch: r.git.branch, identity: r.git.identity, tokenFile: r.git.tokenFile, author: `${r.git.author.name} <${r.git.author.email}>`, ...(r.git.protocol ? { protocol: r.git.protocol } : {}) } } : {}) };
   });
-  return { roots, maxFileBytes: binding.tools.maxFileBytes, maxCallsPerTurn: binding.tools.maxCallsPerTurn, ...(binding.tools.web ? { web: { searxng: binding.tools.web.searxng, maxFetchBytes: binding.tools.web.maxFetchBytes } } : {}) };
+  // setspark carries only the keys loadSetsparkConfig accepts; the extension
+  // re-validates it and adds the response cap itself.
+  const ss = binding.tools.setspark;
+  return { roots, maxFileBytes: binding.tools.maxFileBytes, maxCallsPerTurn: binding.tools.maxCallsPerTurn, ...(binding.tools.web ? { web: { searxng: binding.tools.web.searxng, maxFetchBytes: binding.tools.web.maxFetchBytes } } : {}), ...(ss ? { setspark: { baseUrl: ss.baseUrl, keyFile: ss.keyFile, principal: ss.principal, timeoutMs: ss.timeoutMs } } : {}) };
 }
diff --git a/packages/discord/src/cli.mjs b/packages/discord/src/cli.mjs
index 93d18805..045f4918 100755
--- a/packages/discord/src/cli.mjs
+++ b/packages/discord/src/cli.mjs
@@ -214,7 +214,7 @@ async function run(opts) {
     // The connector's own SetSpark client (bind and approvals) uses the same
     // key as the model's verbs; without a setspark key it has none, and an
     // approval request from the model is refused.
-    const api = toolRoots && toolRoots.setspark ? createSetsparkApi(toolRoots.setspark) : null;
+    const api = binding.tools && binding.tools.setspark ? createSetsparkApi(binding.tools.setspark) : null;
     const connector = createConnector({ binding, journalDir, rest, gateway, engine, api, log: warn });
     let shuttingDown = false;
     let exitCode = 0;
diff --git a/packages/discord/tests/setspark.test.mjs b/packages/discord/tests/setspark.test.mjs
index fc613011..f88dfb23 100644
--- a/packages/discord/tests/setspark.test.mjs
+++ b/packages/discord/tests/setspark.test.mjs
@@ -12,7 +12,7 @@ import {
   loadSetsparkConfig, readKey, idempotencyKey, connectorKey, callApi, renderRefusal, createSetsparkApi, renderRecord,
 } from "../src/setspark.mjs";
 import { loadToolsConfig, createToolSet, enabledToolNames } from "../src/tools.mjs";
-import { validateBinding } from "../src/binding.mjs";
+import { validateBinding, resolveToolRoots } from "../src/binding.mjs";
 import { makeRoot, rawBinding } from "./helpers.mjs";
 
 const KEY_A = "ssk_" + "a".repeat(40);
@@ -120,6 +120,24 @@ test("setspark config: reaches the tools config and the binding as a fixed key",
   assert.throws(() => validateBinding(rawBinding({ tools: { roots: [{ name: "docs", path: docs }], setspark: { baseUrl: "https://api.setspark.io", keyFile: kf, principal: "sage", nope: 1 } } })), /unknown key/);
 });
 
+test("setspark config: the binding's key survives resolveToolRoots and the engine's JSON hand-off to the extension", () => {
+  const root = makeRoot();
+  const docs = join(root, "docs");
+  mkdirSync(docs);
+  const dataRoot = join(root, "data");
+  mkdirSync(dataRoot);
+  const kf = keyFile(root);
+  const b = validateBinding(rawBinding({ tools: { roots: [{ name: "docs", path: docs }], setspark: { baseUrl: "https://api.setspark.io", keyFile: kf, principal: "sage", timeoutMs: 5000 } } }));
+  const resolved = resolveToolRoots(b, { dataRoot });
+  assert.deepEqual(resolved.setspark, { baseUrl: "https://api.setspark.io", keyFile: kf, principal: "sage", timeoutMs: 5000 });
+  for (const name of SETSPARK_TOOL_NAMES) assert.ok(enabledToolNames(resolved).includes(name), `${name} reaches pi's --tools list`);
+  const ext = loadToolsConfig(JSON.parse(JSON.stringify(resolved)));
+  assert.deepEqual(ext.setspark, b.tools.setspark, "the extension rebuilds the same config, response cap included");
+  const plain = resolveToolRoots(validateBinding(rawBinding({ tools: { roots: [{ name: "docs", path: docs }] } })), { dataRoot });
+  assert.equal("setspark" in plain, false);
+  assert.ok(!enabledToolNames(plain).some((n) => SETSPARK_TOOL_NAMES.includes(n)));
+});
+
 test("setspark keys: read per call, one printable token per file, rotation without a restart", async () => {
   const root = makeRoot();
   const c = config(root);