diff --git a/packages/agent-memory-sync/docs/machine-setup.md b/packages/agent-memory-sync/docs/machine-setup.md
index e8cf049..a3970b5 100644
--- a/packages/agent-memory-sync/docs/machine-setup.md
+++ b/packages/agent-memory-sync/docs/machine-setup.md
@@ -19,14 +19,17 @@ This document wires together the pieces already documented individually
   per-machine value (mirroring the profile name) — that made every machine
   write to its own top-level tree in the bare repo and none of them ever
   saw each other's pushes, caught by a live cross-machine E2E test
-  (`pull` reporting `applied=0`). `syncPaths` in every profile is a single
-  `source: "."` directory entry with `destination: "memory"`, so the whole
-  `rootDir` (flat `.md` files, no fixed subdirectory layout) syncs to
-  `pandora/memory/...` in the bare repo, including any file added later. The
-  directory walk skips hidden files/dot-directories (`.DS_Store`, `._*`
-  AppleDouble shadows, `.git`, ...) by design — macOS cruft never becomes a
-  synced file or a recurring inline-conflict-marker diff between machines —
-  and it never follows symlinks under `rootDir` either (silently skipped,
+  (`pull` reporting `applied=0`). The `memory` entry in every profile's
+  `syncPaths` — a `source: "."` directory entry with `destination:
+  "memory"` — covers the whole `rootDir` (flat `.md` files, no fixed
+  subdirectory layout), so it syncs to `pandora/memory/...` in the bare
+  repo, including any file added later (profiles carry further,
+  independent `syncPaths` entries beyond this one — see (e) and (f)
+  below). The directory walk skips hidden files/dot-directories
+  (`.DS_Store`, `._*` AppleDouble shadows, `.git`, ...) by design — macOS
+  cruft never becomes a synced file or a recurring inline-conflict-marker
+  diff between machines — and it never follows symlinks under `rootDir`
+  either (silently skipped,
   not descended into; intentional containment). See `isHiddenEntryName` in
   `src/memory-sync/config.ts` / `src/memory-sync/git-client.ts`.
 - Conflict strategy is `inline-markers` everywhere — concurrent edits that
@@ -298,10 +301,12 @@ is `agent-memory-sync restore`:
 # of guessing why a short one did not resolve.
 agent-memory-sync restore <sha> --config profiles/<name>.json --dry-run
 
-# Roll back a single file — --path is relative to repositorySubdir, and
-# every profile's syncPaths destination is "memory" (see the shared remote
-# tree bullet at the top of this document), so the path is memory/<file>,
-# not just the bare filename:
+# Roll back a single file — --path is relative to repositorySubdir. Only
+# the memory tree's syncPaths destination is "memory" (see the shared
+# remote tree bullet at the top of this document); the other payloads
+# (machine-state, frictions) use their own destinations instead — see
+# (e)/(f) below. So a memory file's path is memory/<file>, not just the
+# bare filename:
 agent-memory-sync restore <sha> --config profiles/<name>.json --path memory/MEMORY.md
 
 # Roll back the entire synced tree (requires --yes)
@@ -337,7 +342,7 @@ one described at the top of this document:
 Unlike the `memory` entry, `source` here is an **absolute path outside
 `rootDir`** — `~/.harness/machine-state`, not anywhere under the Claude Code
 memory directory — pointing at a per-machine toolchain-snapshot directory
-maintained by the (upcoming) harness companion `session-start
+maintained by the (shipped) harness companion `session-start
 toolchain-parity`. `resolveWorkspacePath` in `src/memory-sync/config.ts`
 treats an absolute `source` as-is instead of resolving it against `rootDir`,
 so this entry syncs on its own schedule independent of the memory tree; both
@@ -390,3 +395,52 @@ peer's snapshot is pulled down, so no manual `mkdir` step is required during
 machine setup either — though the harness companion consuming these files
 may still create the directory itself on first run if it expects it to
 exist ahead of any sync.
+
+## f) frictions payload (friction-log exports)
+
+Every committed profile (`profiles/mac-mini.json`, `profiles/macbook.json`,
+`profiles/linux.example.json`) also carries an **independent** `syncPaths`
+entry pointing at `~/.harness/frictions` — the third entry in
+`mac-mini.json`/`macbook.json` (after `memory` and `machine-state`), and
+the second in `linux.example.json` (that template does not yet include a
+`machine-state` entry):
+
+```json
+{ "source": "/Users/<user>/.harness/frictions", "destination": "frictions", "kind": "directory" }
+```
+
+Same convention as the machine-state payload in section e) above: one file
+per machine, named after its own profile (`frictions/mac-mini.json`,
+`frictions/macbook.json`, ...), owner-writes-only, and never any secret —
+the directory is synced into the shared, committed remote, so anything
+dropped there ends up in every peer's git history.
+
+**Producer convention.** Each machine configures `friction-log`'s
+`sync_export.path` setting to `~/.harness/frictions/<its own profile>.json`
+(e.g. `~/.harness/frictions/mac-mini.json`) — `friction-log` writes exactly
+that configured path and never derives a filename of its own, so the
+owner-writes-only convention above is carried entirely by that per-machine
+config, not by anything in this package. The file is also kept current via
+write-through from `friction-log`'s six mutating commands, not only by the
+dedicated `sync-export` verb, so `frictions/<profile>.json` can reflect a
+mutation made through any of those commands, not just an explicit export
+step. This producer (`friction-log`, config-gated) is shipped in
+`agent-dx`, not in this repo; this `syncPaths` entry only carries the
+resulting file, it does not generate it.
+
+The same missing-source tolerance and `mkdir -p`-on-pull behavior described
+above for `machine-state` apply here unchanged, since both are plain
+non-required, absolute-source, directory-kind `syncPaths` entries handled
+by the same code path. The same `watch` caveats from section e) apply too:
+`watch` only pushes and never pulls, so a peer's `frictions/<peer>.json`
+only shows up locally after the next `pull`/`sync`; and `watch` only
+detects this machine's own very first local write into `frictions/` if
+`~/.harness` already existed when `watch` started — on a truly fresh
+machine the first export travels via the periodic sync job or after a
+`watch` restart instead.
+
+**Exposure note.** Friction-log records are free text. Like every other
+payload in this document, anything written into
+`~/.harness/frictions/<profile>.json` is synced into the shared, committed
+remote and therefore counts as published into every peer's git history —
+redact anything sensitive before logging it, not after.
diff --git a/packages/agent-memory-sync/profiles/linux.example.json b/packages/agent-memory-sync/profiles/linux.example.json
index 89362d1..22b85b1 100644
--- a/packages/agent-memory-sync/profiles/linux.example.json
+++ b/packages/agent-memory-sync/profiles/linux.example.json
@@ -81,6 +81,7 @@
   "conflictStrategy": "inline-markers",
   "reachabilityTimeoutMs": 5000,
   "syncPaths": [
-    { "source": ".", "destination": "memory", "kind": "directory" }
+    { "source": ".", "destination": "memory", "kind": "directory" },
+    { "source": "/home/<linux-username>/.harness/frictions", "destination": "frictions", "kind": "directory" }
   ]
 }
diff --git a/packages/agent-memory-sync/profiles/mac-mini.json b/packages/agent-memory-sync/profiles/mac-mini.json
index de12022..891a90f 100644
--- a/packages/agent-memory-sync/profiles/mac-mini.json
+++ b/packages/agent-memory-sync/profiles/mac-mini.json
@@ -117,6 +117,7 @@
   "reachabilityTimeoutMs": 5000,
   "syncPaths": [
     { "source": ".", "destination": "memory", "kind": "directory" },
-    { "source": "/Users/lannguyensi/.harness/machine-state", "destination": "machine-state", "kind": "directory" }
+    { "source": "/Users/lannguyensi/.harness/machine-state", "destination": "machine-state", "kind": "directory" },
+    { "source": "/Users/lannguyensi/.harness/frictions", "destination": "frictions", "kind": "directory" }
   ]
 }
diff --git a/packages/agent-memory-sync/profiles/macbook.json b/packages/agent-memory-sync/profiles/macbook.json
index a8e450f..36d8959 100644
--- a/packages/agent-memory-sync/profiles/macbook.json
+++ b/packages/agent-memory-sync/profiles/macbook.json
@@ -110,6 +110,11 @@
       "source": "/Users/lan/.harness/machine-state",
       "destination": "machine-state",
       "kind": "directory"
+    },
+    {
+      "source": "/Users/lan/.harness/frictions",
+      "destination": "frictions",
+      "kind": "directory"
     }
   ]
 }
\ No newline at end of file
diff --git a/packages/agent-memory-sync/tests/integration/cross-machine-profiles.test.ts b/packages/agent-memory-sync/tests/integration/cross-machine-profiles.test.ts
index 17da935..c06bfc9 100644
--- a/packages/agent-memory-sync/tests/integration/cross-machine-profiles.test.ts
+++ b/packages/agent-memory-sync/tests/integration/cross-machine-profiles.test.ts
@@ -155,4 +155,65 @@ test("profiles/macbook.json, profiles/mac-mini.json, and profiles/linux.example.
         "in src/memory-sync/config.ts); the 'profile' field is local-only and may differ"
     );
   }
+
+  // Pin the frictions syncPaths entry (agent-tasks 343d5a8f) directly
+  // against each committed profile file — deliberately placed in THIS test,
+  // not the live push/pull E2E test above, because this one parses the
+  // profile JSON via settingsByFile and never touches a real machine's home
+  // directory, so it stays green even where the E2E test's EACCES failure
+  // (mac-mini.json's hardcoded /Users/lannguyensi paths on a machine that
+  // isn't the mini) applies. Without this block, reverting the three
+  // profiles' new syncPaths entry left the suite fully green — nothing else
+  // reads the committed profile files for this entry.
+  function findEntriesByDestination(
+    syncPaths: Array<Record<string, unknown>> | undefined,
+    destination: string
+  ): Array<Record<string, unknown>> {
+    return (syncPaths || []).filter((entry) => entry.destination === destination);
+  }
+
+  for (const file of profileFiles) {
+    const frictionsEntries = findEntriesByDestination(settingsByFile[file].syncPaths, "frictions");
+    assert.equal(
+      frictionsEntries.length,
+      1,
+      `profiles/${file} must declare exactly one syncPaths entry with destination 'frictions', found ${frictionsEntries.length}`
+    );
+    const [frictionsEntry] = frictionsEntries;
+    assert.equal(frictionsEntry.kind, "directory", `profiles/${file} frictions entry must be kind 'directory'`);
+    assert.ok(
+      typeof frictionsEntry.source === "string" && path.isAbsolute(frictionsEntry.source as string),
+      `profiles/${file} frictions entry source must be an absolute path, got: ${JSON.stringify(frictionsEntry.source)}`
+    );
+    assert.ok(
+      (frictionsEntry.source as string).endsWith("/.harness/frictions"),
+      `profiles/${file} frictions entry source must end with '/.harness/frictions', got: ${frictionsEntry.source}`
+    );
+    assert.ok(
+      !frictionsEntry.required,
+      `profiles/${file} frictions entry must not be required (missing-source tolerance is the point)`
+    );
+  }
+
+  // Same pin for the pre-existing machine-state entry, closing the identical
+  // #64 coverage gap — macbook.json and mac-mini.json only, since
+  // linux.example.json's template has never carried a machine-state entry.
+  for (const file of ["macbook.json", "mac-mini.json"]) {
+    const machineStateEntries = findEntriesByDestination(settingsByFile[file].syncPaths, "machine-state");
+    assert.equal(
+      machineStateEntries.length,
+      1,
+      `profiles/${file} must declare exactly one syncPaths entry with destination 'machine-state', found ${machineStateEntries.length}`
+    );
+    const [machineStateEntry] = machineStateEntries;
+    assert.equal(machineStateEntry.kind, "directory", `profiles/${file} machine-state entry must be kind 'directory'`);
+    assert.ok(
+      typeof machineStateEntry.source === "string" && path.isAbsolute(machineStateEntry.source as string),
+      `profiles/${file} machine-state entry source must be an absolute path, got: ${JSON.stringify(machineStateEntry.source)}`
+    );
+    assert.ok(
+      (machineStateEntry.source as string).endsWith("/.harness/machine-state"),
+      `profiles/${file} machine-state entry source must end with '/.harness/machine-state', got: ${machineStateEntry.source}`
+    );
+  }
 });
diff --git a/packages/agent-memory-sync/tests/integration/frictions-syncpath.test.ts b/packages/agent-memory-sync/tests/integration/frictions-syncpath.test.ts
new file mode 100644
index 0000000..3f3b2c0
--- /dev/null
+++ b/packages/agent-memory-sync/tests/integration/frictions-syncpath.test.ts
@@ -0,0 +1,140 @@
+// Pins the frictions syncPaths convention (agent-tasks 343d5a8f: "agent-memory-sync:
+// frictions syncPaths-Eintrag in allen Maschinen-Profilen"): a third,
+// independent directory-kind syncPaths entry whose `source` is an ABSOLUTE
+// path OUTSIDE rootDir — mirroring profiles/mac-mini.json, profiles/macbook.json,
+// and profiles/linux.example.json's real frictions entry, which points at
+// ~/.harness/frictions rather than anywhere under the Claude Code memory
+// rootDir. This is the exact PR-#64 machine-state-syncpath pattern (see
+// tests/integration/machine-state-syncpath.test.ts) applied to the frictions
+// payload — same two guarantees, both already true of
+// collectLocalSyncFiles/mapRemotePathToLocalAbsolute in
+// src/memory-sync/config.ts and src/memory-sync/pull.ts WITHOUT any code
+// change:
+//   1. A directory-kind entry with an absolute `source` syncs correctly
+//      end-to-end through push+pull alongside sibling entries —
+//      resolveWorkspacePath (src/memory-sync/config.ts) treats an absolute
+//      candidate as-is instead of resolving it against rootDir.
+//   2. Neither `push` nor `pull` breaks when that absolute source directory
+//      does not exist locally yet: config.ts's collectLocalSyncFiles skips a
+//      non-required syncPaths entry whose source is missing (existsSync
+//      check, `continue`), and pull's writer
+//      (mkdirSync(path.dirname(...), { recursive: true }) in
+//      src/memory-sync/pull.ts) creates that absolute directory the first
+//      time a peer's snapshot is pulled — so a fresh machine's frictions
+//      directory need not pre-exist before its first pull.
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const path = require("node:path");
+const {
+  cloneRemote,
+  createSandbox,
+  fileExists,
+  initBareRemote,
+  readText,
+  runCli,
+  writeProjectConfig,
+  writeText
+} = require("../helpers/cli.ts");
+
+function twoEntryConfig(
+  workspaceRoot: string,
+  remoteDir: string,
+  stateDir: string,
+  frictionsSource: string
+) {
+  return {
+    rootDir: workspaceRoot,
+    remoteUrl: remoteDir,
+    branch: "main",
+    repositorySubdir: "shared",
+    stateDir,
+    conflictStrategy: "inline-markers",
+    syncPaths: [
+      { source: "MEMORY.md", destination: "MEMORY.md", kind: "file" },
+      { source: frictionsSource, destination: "frictions", kind: "directory" }
+    ]
+  };
+}
+
+test("push tolerates a second syncPaths directory entry whose absolute source does not exist locally yet", () => {
+  const root = createSandbox("frictions-missing-source");
+  const remoteDir = initBareRemote(root);
+  const workspaceRoot = path.join(root, "workspace");
+  const stateDir = path.join(root, "state");
+  const configPath = path.join(root, "config.json");
+  // Absolute path outside rootDir/workspaceRoot, deliberately never
+  // created — mirrors a fresh machine that has not written a friction-log
+  // export to ~/.harness/frictions yet.
+  const frictionsSource = path.join(root, "harness-frictions");
+
+  writeText(path.join(workspaceRoot, "MEMORY.md"), "seed\n");
+  writeProjectConfig(configPath, twoEntryConfig(workspaceRoot, remoteDir, stateDir, frictionsSource));
+  assert.equal(fileExists(frictionsSource), false);
+
+  const result = runCli(["run", "default", "--config", configPath, "--mode", "push", "--output", "json"]);
+  const payload = JSON.parse(result.stdout);
+
+  assert.equal(payload.runs[0].status, "applied");
+  assert.ok(
+    payload.runs[0].appliedFiles.some((f: string) => f.endsWith("MEMORY.md")),
+    `expected MEMORY.md in appliedFiles: ${JSON.stringify(payload.runs[0].appliedFiles)}`
+  );
+  assert.ok(
+    !payload.runs[0].appliedFiles.some((f: string) => f.startsWith("frictions/")),
+    `missing source should not have synced anything: ${JSON.stringify(payload.runs[0].appliedFiles)}`
+  );
+
+  const inspection = cloneRemote(remoteDir, root, "inspect-missing-source");
+  assert.equal(fileExists(path.join(inspection, "shared", "frictions")), false);
+});
+
+test(
+  "push and pull round-trip a directory syncPaths entry whose source is absolute and outside rootDir, " +
+    "and pull creates that directory locally if missing (mkdir -p semantics)",
+  () => {
+    const root = createSandbox("frictions-roundtrip");
+    const remoteDir = initBareRemote(root);
+
+    // Machine A already has a friction-log export on disk and pushes it.
+    const workspaceA = path.join(root, "workspace-a");
+    const stateDirA = path.join(root, "state-a");
+    const configPathA = path.join(root, "config-a.json");
+    const frictionsSourceA = path.join(root, "machine-a-harness-frictions");
+
+    writeText(path.join(workspaceA, "MEMORY.md"), "machine a memory\n");
+    writeText(path.join(frictionsSourceA, "mac-mini.json"), '{"frictions":[]}\n');
+    writeProjectConfig(configPathA, twoEntryConfig(workspaceA, remoteDir, stateDirA, frictionsSourceA));
+
+    const pushResult = runCli(["run", "default", "--config", configPathA, "--mode", "push", "--output", "json"]);
+    const pushPayload = JSON.parse(pushResult.stdout);
+    assert.equal(pushPayload.runs[0].status, "applied");
+    assert.ok(
+      pushPayload.runs[0].appliedFiles.includes("frictions/mac-mini.json"),
+      `expected frictions/mac-mini.json in appliedFiles: ${JSON.stringify(pushPayload.runs[0].appliedFiles)}`
+    );
+
+    // Machine B has never written to its frictions source directory — it
+    // (and its rootDir) do not exist on disk at all before the pull below,
+    // matching a brand-new machine's first `run --mode pull`.
+    const workspaceB = path.join(root, "workspace-b");
+    const stateDirB = path.join(root, "state-b");
+    const configPathB = path.join(root, "config-b.json");
+    const frictionsSourceB = path.join(root, "machine-b-harness-frictions");
+
+    writeProjectConfig(configPathB, twoEntryConfig(workspaceB, remoteDir, stateDirB, frictionsSourceB));
+    assert.equal(fileExists(frictionsSourceB), false);
+    assert.equal(fileExists(workspaceB), false);
+
+    const pullResult = runCli(["run", "default", "--config", configPathB, "--mode", "pull", "--output", "json"]);
+    const pullPayload = JSON.parse(pullResult.stdout);
+    assert.equal(pullPayload.runs[0].status, "applied");
+    assert.ok(
+      pullPayload.runs[0].appliedFiles.includes("frictions/mac-mini.json"),
+      `expected frictions/mac-mini.json in pull appliedFiles: ${JSON.stringify(pullPayload.runs[0].appliedFiles)}`
+    );
+
+    assert.equal(fileExists(frictionsSourceB), true);
+    assert.equal(readText(path.join(frictionsSourceB, "mac-mini.json")), '{"frictions":[]}\n');
+    assert.equal(readText(path.join(workspaceB, "MEMORY.md")), "machine a memory\n");
+  }
+);