feat(files): @shade/files 0.3.0 — E2EE filesystem RPC primitive

M-Files-1..6 land the full files-RPC layer + everything 0.3.0 needs to
ship. Apps keep their own UI; this layer ships the typed RPC, the
streams bridge for content I/O, and production hooks (rate limit,
retention, fingerprint gate, metrics).

@shade/files (NEW)
- Standard ops: list/stat/mkdir/delete/move/read/write/getThumbnail with
  Zod-validated wire schemas + clean user-handler types.
- Custom ops: typed via TypeScript declaration merging on CustomOpsMap
  + per-op Zod schemas; client.custom('app.foo', {...}) is fully typed.
- Content I/O: inline (≤ 256 KiB plaintext) base64-in-RPC; streams
  (> 256 KiB) ride @shade/transfer via userMetadata.shadeFilesWriteId
  / shadeFilesReadStreamId correlation. Server-side TransformStream
  bridges accept inbound transfers immediately (engine rejects chunks
  that arrive before accept) and park the readable for the matching
  RPC.
- Directory ops: walk(path, opts) async-iterable depth-first walker;
  uploadDirectory()/downloadDirectory() with bounded concurrency pool
  (default 4, cap 16), aggregated progress, abort.
- Production hooks (callback-based, vendor-neutral): rate-limit (op +
  byte), idempotency cache (LRU + TTL + in-flight de-dupe), path
  policy (traversal + percent-decode hardening), fingerprint gate
  (required/optional/reject), pluggable Ed25519 sig verification with
  ±5 min replay window, onMetric sink (standard names).
- React hooks (subpath @shade/files/react): ShadeFilesProvider,
  useShadeFiles, useFileList, useFileTransfer/Upload/Download.
- Shade.files.serve(handler) + Shade.files.client(peer) high-level
  entrypoint in @shade/sdk; lazy + memoized; one handler per Shade.

Wire format bump
- @shade/proto wire VERSION 0x01 → 0x02. Length prefixes changed from
  u16 to u32. The previous u16 silently truncated payloads above
  64 KiB — a hard correctness ceiling that blocked inline file ops
  up to 256 KiB. Wire-incompatible with 0.2.x peers; new sessions
  only. Cross-platform Kotlin port (android/shade-android) updated to
  match; test-vectors/wire-format.json regenerated.

Concurrency safety
- ShadeSessionManager.encrypt/.decrypt now run under per-peer mutex.
  Concurrent decryptions of the same peer raced ratchet state
  (manifested as sporadic "Failed to decrypt — wrong key or tampered
  data" under load — surfaced once concurrent uploadDirectory pumped
  many writes in flight). Encrypt was already serialized via
  Shade.send's encryptChains; decrypt is now serialized at the
  manager layer too.

@shade/streams extension
- StreamMetadata.userMetadata?: Record<string, string> for
  application-level key/value pairs that round-trip verbatim through
  stream-init plaintext. Used by @shade/files for write/read
  correlation; available to any consumer.

@shade/sdk extension
- Shade.files getter (lazy + memoized).
- BackgroundHooks.onPruneFiles + periodic timer (default 5 min) +
  BackgroundTasks.setHook(name, fn) for runtime hook registration.

Bundles in-flight 0.2.0 work
- packages/shade-streams/, packages/shade-transfer/, related
  shade-sdk streams-bridge + shade-widgets transfer hooks were
  uncommitted prior to this session. Including them keeps the
  workspace consistent at 0.3.0 since @shade/files depends on them.

Tests
- 74 new tests in @shade/files (572 → 646 workspace pass; 0 fail;
  3× stable). Coverage spans unit (inline-threshold + concurrency),
  integration (read-write inline + streams up to 1 MiB, walk +
  upload/download directory, custom-op, metrics, SDK namespace
  end-to-end), and security (tampered-envelope sig verification,
  replay window, fingerprint gate, rate-limit + quota).

Release artifacts
- All packages bumped to 0.3.0 via scripts/bump-version.ts.
- scripts/publish-all.ts PACKAGES updated with shade-files in
  topological order (after shade-transfer, before shade-sdk).
- bun run publish:dry clean (14 packed, 0 failed).
- examples/08-files-browser/ — three-process CLI demo (prekey + Bob
  server + Alice CLI) covering list/stat/mkdir/delete/upload/download.
- docs/files.md — full API + design doc.
- CHANGELOG.md 0.3.0 entry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/shade-files/tests/unit/canonical.test.ts

@@ -0,0 +1,135 @@
+import { describe, test, expect } from 'bun:test';
+import {
+  canonicalRpcBytes,
+  canonicalJsonStringify,
+  hashArgs,
+  bytesToHex,
+  bytesToBase64,
+  base64ToBytes,
+} from '../../src/index.js';
+
+describe('canonicalJsonStringify', () => {
+  test('sorts object keys', () => {
+    expect(canonicalJsonStringify({ b: 1, a: 2 })).toBe('{"a":2,"b":1}');
+  });
+
+  test('skips undefined values', () => {
+    expect(canonicalJsonStringify({ a: 1, b: undefined, c: 2 })).toBe('{"a":1,"c":2}');
+  });
+
+  test('preserves array order', () => {
+    expect(canonicalJsonStringify([3, 1, 2])).toBe('[3,1,2]');
+  });
+
+  test('recursive sorting', () => {
+    const a = canonicalJsonStringify({ outer: { y: 1, x: 2 } });
+    const b = canonicalJsonStringify({ outer: { x: 2, y: 1 } });
+    expect(a).toBe(b);
+    expect(a).toBe('{"outer":{"x":2,"y":1}}');
+  });
+
+  test('handles primitives', () => {
+    expect(canonicalJsonStringify(null)).toBe('null');
+    expect(canonicalJsonStringify(true)).toBe('true');
+    expect(canonicalJsonStringify(42)).toBe('42');
+    expect(canonicalJsonStringify('hi')).toBe('"hi"');
+  });
+
+  test('different argument orders hash identically', () => {
+    const h1 = hashArgs({ b: 1, a: 2 });
+    const h2 = hashArgs({ a: 2, b: 1 });
+    expect(bytesToHex(h1)).toBe(bytesToHex(h2));
+  });
+
+  test('different values hash differently', () => {
+    expect(bytesToHex(hashArgs({ a: 1 }))).not.toBe(bytesToHex(hashArgs({ a: 2 })));
+  });
+});
+
+describe('canonicalRpcBytes', () => {
+  test('deterministic for same input (known vector)', () => {
+    const args = {
+      address: 'alice',
+      signedAt: 1730000000000,
+      kind: 'shade.fs.list/v1',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      argsHash: new Uint8Array(32).fill(0xab),
+    };
+    const a = canonicalRpcBytes(args);
+    const b = canonicalRpcBytes(args);
+    expect(a).toEqual(b);
+  });
+
+  test('changes when address differs', () => {
+    const base = {
+      signedAt: 1,
+      kind: 'shade.fs.list/v1',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      argsHash: new Uint8Array(32),
+    };
+    const a = canonicalRpcBytes({ ...base, address: 'alice' });
+    const b = canonicalRpcBytes({ ...base, address: 'bob' });
+    expect(a).not.toEqual(b);
+  });
+
+  test('changes when signedAt differs', () => {
+    const base = {
+      address: 'alice',
+      kind: 'shade.fs.list/v1',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      argsHash: new Uint8Array(32),
+    };
+    expect(canonicalRpcBytes({ ...base, signedAt: 1 })).not.toEqual(
+      canonicalRpcBytes({ ...base, signedAt: 2 }),
+    );
+  });
+
+  test('changes when kind differs', () => {
+    const base = {
+      address: 'alice',
+      signedAt: 1,
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      argsHash: new Uint8Array(32),
+    };
+    expect(canonicalRpcBytes({ ...base, kind: 'shade.fs.list/v1' })).not.toEqual(
+      canonicalRpcBytes({ ...base, kind: 'shade.fs.stat/v1' }),
+    );
+  });
+
+  test('changes when argsHash differs', () => {
+    const base = {
+      address: 'alice',
+      signedAt: 1,
+      kind: 'shade.fs.list/v1',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+    };
+    expect(
+      canonicalRpcBytes({ ...base, argsHash: new Uint8Array(32) }),
+    ).not.toEqual(
+      canonicalRpcBytes({ ...base, argsHash: new Uint8Array(32).fill(1) }),
+    );
+  });
+});
+
+describe('hashArgs', () => {
+  test('produces 32-byte digest', () => {
+    expect(hashArgs({ a: 1 }).length).toBe(32);
+  });
+
+  test('null input is fine', () => {
+    expect(hashArgs(null).length).toBe(32);
+  });
+});
+
+describe('bytesToHex / base64', () => {
+  test('hex roundtrip', () => {
+    const b = new Uint8Array([0x01, 0xab, 0xff, 0x00]);
+    expect(bytesToHex(b)).toBe('01abff00');
+  });
+
+  test('base64 roundtrip', () => {
+    const b = new Uint8Array([1, 2, 3, 4]);
+    const enc = bytesToBase64(b);
+    expect(base64ToBytes(enc)).toEqual(b);
+  });
+});

packages/shade-files/tests/unit/concurrency.test.ts

@@ -0,0 +1,90 @@
+import { describe, test, expect } from 'bun:test';
+import { runWithConcurrency } from '../../src/client/concurrency.js';
+
+async function* range(n: number): AsyncIterable<number> {
+  for (let i = 0; i < n; i++) yield i;
+}
+
+function delay(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+describe('runWithConcurrency', () => {
+  test('runs all items', async () => {
+    const seen: number[] = [];
+    await runWithConcurrency(range(10), async (i) => {
+      seen.push(i);
+    }, { concurrency: 4 });
+    expect(seen.sort((a, b) => a - b)).toEqual([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
+  });
+
+  test('respects concurrency cap (never exceeds N inflight)', async () => {
+    let inflight = 0;
+    let peak = 0;
+    await runWithConcurrency(range(50), async () => {
+      inflight++;
+      peak = Math.max(peak, inflight);
+      await delay(5);
+      inflight--;
+    }, { concurrency: 4 });
+    expect(peak).toBeLessThanOrEqual(4);
+    expect(peak).toBeGreaterThanOrEqual(2);
+  });
+
+  test('throws on first error by default (fail-fast)', async () => {
+    let processed = 0;
+    await expect(
+      runWithConcurrency(range(20), async (i) => {
+        await delay(1);
+        if (i === 3) throw new Error('boom');
+        processed++;
+      }, { concurrency: 2 }),
+    ).rejects.toThrow('boom');
+    // We don't process all 20; bounded by fail-fast.
+    expect(processed).toBeLessThan(20);
+  });
+
+  test('continueOnError reports each + drains', async () => {
+    const errors: number[] = [];
+    let processed = 0;
+    await runWithConcurrency(range(10), async (i) => {
+      await delay(1);
+      if (i % 3 === 0) throw new Error(`bad-${i}`);
+      processed++;
+    }, {
+      concurrency: 3,
+      continueOnError: true,
+      onError: (item) => errors.push(item),
+    });
+    expect(processed).toBe(6); // i = 1,2,4,5,7,8
+    expect(errors.sort((a, b) => a - b)).toEqual([0, 3, 6, 9]);
+  });
+
+  test('aborts via signal', async () => {
+    const ctrl = new AbortController();
+    let processed = 0;
+    setTimeout(() => ctrl.abort(), 20);
+    await expect(
+      runWithConcurrency(range(100), async () => {
+        await delay(5);
+        processed++;
+      }, { concurrency: 4, signal: ctrl.signal }),
+    ).rejects.toThrow();
+    expect(processed).toBeLessThan(100);
+  });
+
+  test('concurrency=1 is sequential', async () => {
+    const order: number[] = [];
+    await runWithConcurrency(range(5), async (i) => {
+      order.push(i);
+      await delay(1);
+    }, { concurrency: 1 });
+    expect(order).toEqual([0, 1, 2, 3, 4]);
+  });
+
+  test('throws on concurrency < 1', () => {
+    expect(() =>
+      runWithConcurrency(range(0), async () => undefined, { concurrency: 0 }),
+    ).toThrow('concurrency must be ≥ 1');
+  });
+});

packages/shade-files/tests/unit/correlate.test.ts

@@ -0,0 +1,64 @@
+import { describe, test, expect } from 'bun:test';
+import * as fc from 'fast-check';
+import {
+  generateRequestId,
+  generateIdempotencyKey,
+  base64UrlEncode,
+  base64UrlDecode,
+  RequestIdSchema,
+} from '../../src/index.js';
+
+describe('generateRequestId', () => {
+  test('produces 22-char base64url string', () => {
+    const id = generateRequestId();
+    expect(id.length).toBe(22);
+    expect(RequestIdSchema.safeParse(id).success).toBe(true);
+  });
+
+  test('1e5 generated IDs are all unique', () => {
+    const seen = new Set<string>();
+    for (let i = 0; i < 100_000; i++) {
+      const id = generateRequestId();
+      expect(seen.has(id)).toBe(false);
+      seen.add(id);
+    }
+    expect(seen.size).toBe(100_000);
+  });
+
+  test('generateIdempotencyKey returns the same shape', () => {
+    expect(generateIdempotencyKey().length).toBe(22);
+  });
+});
+
+describe('base64url encode/decode', () => {
+  test('roundtrip arbitrary bytes (property-based)', () => {
+    fc.assert(
+      fc.property(fc.uint8Array({ minLength: 0, maxLength: 64 }), (bytes) => {
+        const decoded = base64UrlDecode(base64UrlEncode(bytes));
+        expect(decoded).toEqual(bytes);
+      }),
+      { numRuns: 500 },
+    );
+  });
+
+  test('produces URL-safe alphabet only', () => {
+    fc.assert(
+      fc.property(fc.uint8Array({ minLength: 1, maxLength: 64 }), (bytes) => {
+        const enc = base64UrlEncode(bytes);
+        expect(enc).not.toMatch(/[+/=]/);
+      }),
+      { numRuns: 200 },
+    );
+  });
+
+  test('handles empty input', () => {
+    expect(base64UrlEncode(new Uint8Array(0))).toBe('');
+    expect(base64UrlDecode('')).toEqual(new Uint8Array(0));
+  });
+
+  test('decodes inputs without padding correctly', () => {
+    expect(base64UrlDecode('YQ')).toEqual(new Uint8Array([0x61]));
+    expect(base64UrlDecode('YWI')).toEqual(new Uint8Array([0x61, 0x62]));
+    expect(base64UrlDecode('YWJj')).toEqual(new Uint8Array([0x61, 0x62, 0x63]));
+  });
+});

packages/shade-files/tests/unit/envelope-codec.test.ts

@@ -0,0 +1,149 @@
+import { describe, test, expect } from 'bun:test';
+import {
+  encodeEnvelope,
+  looksLikeFileEnvelope,
+  tryParseEnvelope,
+  classify,
+  KIND_LIST_V1,
+  KIND_ERROR_V1,
+  KIND_CANCEL_V1,
+  responseKindOf,
+} from '../../src/index.js';
+import type { RpcRequest, RpcResponse, RpcError, RpcCancel } from '../../src/index.js';
+
+const ID = 'AbCdEfGhIjKlMnOpQrStUv';
+
+describe('looksLikeFileEnvelope', () => {
+  test('matches plaintext containing shade.fs', () => {
+    expect(looksLikeFileEnvelope('{"kind":"shade.fs.list/v1"}')).toBe(true);
+  });
+  test('rejects unrelated', () => {
+    expect(looksLikeFileEnvelope('hello world')).toBe(false);
+    expect(looksLikeFileEnvelope('{"kind":"shade.stream-init/v1"}')).toBe(false);
+  });
+});
+
+describe('tryParseEnvelope', () => {
+  test('returns null on non-JSON', () => {
+    expect(tryParseEnvelope('not json {{')).toBeNull();
+  });
+
+  test('returns null on JSON that does not match any envelope', () => {
+    expect(tryParseEnvelope('{"kind":"unknown"}')).toBeNull();
+    expect(tryParseEnvelope('{"foo":"bar"}')).toBeNull();
+  });
+
+  test('classifies request', () => {
+    const req: RpcRequest = {
+      kind: KIND_LIST_V1,
+      id: ID,
+      args: { path: '/' },
+      sig: 'abc',
+      signedAt: 1,
+    };
+    const c = tryParseEnvelope(encodeEnvelope(req));
+    expect(c?.kind).toBe('request');
+  });
+
+  test('classifies response', () => {
+    const resp: RpcResponse = {
+      kind: responseKindOf(KIND_LIST_V1),
+      id: ID,
+      result: { entries: [], hasMore: false },
+    };
+    const c = tryParseEnvelope(encodeEnvelope(resp));
+    expect(c?.kind).toBe('response');
+  });
+
+  test('classifies error', () => {
+    const err: RpcError = {
+      kind: KIND_ERROR_V1,
+      id: ID,
+      error: { code: 'NOT_FOUND', message: 'missing' },
+    };
+    const c = tryParseEnvelope(encodeEnvelope(err));
+    expect(c?.kind).toBe('error');
+  });
+
+  test('classifies cancel', () => {
+    const cancel: RpcCancel = {
+      kind: KIND_CANCEL_V1,
+      id: ID,
+      reason: 'user-cancel',
+    };
+    const c = tryParseEnvelope(encodeEnvelope(cancel));
+    expect(c?.kind).toBe('cancel');
+  });
+
+  test('rejects request with missing fields', () => {
+    expect(tryParseEnvelope(JSON.stringify({ kind: KIND_LIST_V1 }))).toBeNull();
+    expect(
+      tryParseEnvelope(
+        JSON.stringify({ kind: KIND_LIST_V1, id: ID, args: {}, sig: 'x' }),
+      ),
+    ).toBeNull(); // missing signedAt
+  });
+
+  test('rejects response shape with non-.response suffix and no signature', () => {
+    // Missing both `.response` suffix (so not a response) AND missing
+    // `sig`/`signedAt` (so not a valid request) → no schema matches.
+    expect(
+      tryParseEnvelope(
+        JSON.stringify({ kind: 'shade.fs.list/v1', id: ID, result: {} }),
+      ),
+    ).toBeNull();
+  });
+
+  test('rejects malformed id length', () => {
+    const req = {
+      kind: KIND_LIST_V1,
+      id: 'short',
+      args: {},
+      sig: 'x',
+      signedAt: 1,
+    };
+    expect(tryParseEnvelope(JSON.stringify(req))).toBeNull();
+  });
+});
+
+describe('classify on already-validated envelopes', () => {
+  test('correct discriminator on each branch', () => {
+    const req: RpcRequest = {
+      kind: KIND_LIST_V1, id: ID, args: {}, sig: 'x', signedAt: 1,
+    };
+    expect(classify(req).kind).toBe('request');
+
+    const resp: RpcResponse = {
+      kind: responseKindOf(KIND_LIST_V1), id: ID, result: {},
+    };
+    expect(classify(resp).kind).toBe('response');
+
+    const err: RpcError = {
+      kind: KIND_ERROR_V1, id: ID, error: { code: 'NOT_FOUND', message: '' },
+    };
+    expect(classify(err).kind).toBe('error');
+
+    const cancel: RpcCancel = { kind: KIND_CANCEL_V1, id: ID };
+    expect(classify(cancel).kind).toBe('cancel');
+  });
+});
+
+describe('encodeEnvelope', () => {
+  test('roundtrips request envelope', () => {
+    const req: RpcRequest = {
+      kind: KIND_LIST_V1,
+      id: ID,
+      args: { path: '/foo' },
+      idempotencyKey: 'IdemKeyAaBbCcDdEeFfGgH',
+      attempt: 1,
+      sig: 'sig',
+      signedAt: 1730000000000,
+    };
+    const c = tryParseEnvelope(encodeEnvelope(req));
+    expect(c?.kind).toBe('request');
+    if (c?.kind === 'request') {
+      expect(c.envelope.idempotencyKey).toBe('IdemKeyAaBbCcDdEeFfGgH');
+      expect(c.envelope.attempt).toBe(1);
+    }
+  });
+});

packages/shade-files/tests/unit/idempotency-cache.test.ts

@@ -0,0 +1,108 @@
+import { describe, test, expect } from 'bun:test';
+import { IdempotencyCache, IdempotencyConflictError } from '../../src/index.js';
+
+describe('IdempotencyCache.begin', () => {
+  test('first call returns fresh', () => {
+    const cache = new IdempotencyCache();
+    const result = cache.begin('alice', 'key1', { path: '/foo' });
+    expect(result.status).toBe('fresh');
+  });
+
+  test('replay returns cached response', () => {
+    const cache = new IdempotencyCache();
+    const a = cache.begin('alice', 'key1', { path: '/foo' });
+    if (a.status !== 'fresh') throw new Error('expected fresh');
+    a.commit({ ok: true });
+
+    const b = cache.begin('alice', 'key1', { path: '/foo' });
+    expect(b.status).toBe('replay');
+    if (b.status === 'replay') {
+      expect(b.response).toEqual({ ok: true });
+    }
+  });
+
+  test('argsHash mismatch throws IdempotencyConflictError', () => {
+    const cache = new IdempotencyCache();
+    const a = cache.begin('alice', 'key1', { path: '/foo' });
+    if (a.status !== 'fresh') throw new Error('expected fresh');
+    a.commit({ ok: true });
+
+    expect(() =>
+      cache.begin('alice', 'key1', { path: '/different' }),
+    ).toThrow(IdempotencyConflictError);
+  });
+
+  test('inflight retry returns wait-promise', async () => {
+    const cache = new IdempotencyCache();
+    const a = cache.begin('alice', 'key1', { x: 1 });
+    if (a.status !== 'fresh') throw new Error('expected fresh');
+
+    const b = cache.begin('alice', 'key1', { x: 1 });
+    expect(b.status).toBe('wait');
+
+    if (b.status === 'wait') {
+      a.commit({ result: 42 });
+      const v = await b.promise;
+      expect(v).toEqual({ result: 42 });
+    }
+  });
+
+  test('different senders are isolated', () => {
+    const cache = new IdempotencyCache();
+    const a = cache.begin('alice', 'k', { x: 1 });
+    if (a.status !== 'fresh') throw new Error('expected fresh');
+    a.commit({ side: 'alice' });
+
+    const b = cache.begin('bob', 'k', { x: 1 });
+    expect(b.status).toBe('fresh');
+  });
+
+  test('abandon removes the entry so retries proceed fresh', () => {
+    const cache = new IdempotencyCache();
+    const a = cache.begin('alice', 'key', { p: 1 });
+    if (a.status !== 'fresh') throw new Error('expected fresh');
+    a.abandon();
+
+    const b = cache.begin('alice', 'key', { p: 1 });
+    expect(b.status).toBe('fresh');
+  });
+});
+
+describe('IdempotencyCache TTL + LRU', () => {
+  test('expired entries are evicted on next access', async () => {
+    const cache = new IdempotencyCache({ ttlMs: 5 });
+    const a = cache.begin('alice', 'k', { x: 1 });
+    if (a.status !== 'fresh') throw new Error('expected fresh');
+    a.commit('done');
+
+    await new Promise((r) => setTimeout(r, 15));
+
+    const b = cache.begin('alice', 'k', { x: 1 });
+    expect(b.status).toBe('fresh'); // expired → fresh again
+  });
+
+  test('LRU caps per-sender entries', () => {
+    const cache = new IdempotencyCache({ maxEntriesPerSender: 3 });
+    for (let i = 0; i < 5; i++) {
+      const r = cache.begin('alice', `key${i}`, { i });
+      if (r.status === 'fresh') r.commit(i);
+    }
+    expect(cache.size()).toBe(3); // first two evicted
+  });
+});
+
+describe('IdempotencyCache.prune', () => {
+  test('removes only TTL-expired entries', async () => {
+    // Two senders so begin() on one doesn't auto-evict the other's expired entry.
+    const cache = new IdempotencyCache({ ttlMs: 5 });
+    const a = cache.begin('alice', 'old', { x: 1 });
+    if (a.status === 'fresh') a.commit(1);
+    await new Promise((r) => setTimeout(r, 15));
+    const b = cache.begin('bob', 'new', { x: 2 });
+    if (b.status === 'fresh') b.commit(2);
+
+    const removed = cache.prune();
+    expect(removed).toBe(1); // alice/old expired; bob/new fresh
+    expect(cache.size()).toBe(1);
+  });
+});

packages/shade-files/tests/unit/inline-threshold.test.ts

@@ -0,0 +1,161 @@
+import { describe, expect, test } from 'bun:test';
+import { decideInline, INLINE_THRESHOLD } from '../../src/client/inline-threshold.js';
+
+const KIB = 1024;
+
+function streamOf(...chunks: Uint8Array[]): ReadableStream<Uint8Array> {
+  let i = 0;
+  return new ReadableStream<Uint8Array>({
+    pull(controller) {
+      if (i < chunks.length) {
+        controller.enqueue(chunks[i]!);
+        i++;
+      } else {
+        controller.close();
+      }
+    },
+  });
+}
+
+async function drainStream(s: ReadableStream<Uint8Array>): Promise<Uint8Array> {
+  const reader = s.getReader();
+  const parts: Uint8Array[] = [];
+  let total = 0;
+  while (true) {
+    const { value, done } = await reader.read();
+    if (done) break;
+    if (value === undefined) continue;
+    parts.push(value);
+    total += value.byteLength;
+  }
+  reader.releaseLock();
+  const out = new Uint8Array(total);
+  let offset = 0;
+  for (const p of parts) {
+    out.set(p, offset);
+    offset += p.byteLength;
+  }
+  return out;
+}
+
+describe('decideInline (Uint8Array)', () => {
+  test('1 KiB → inline', async () => {
+    const bytes = new Uint8Array(KIB).fill(0xab);
+    const decision = await decideInline(bytes);
+    expect(decision.kind).toBe('inline');
+    if (decision.kind === 'inline') {
+      expect(decision.bytes.byteLength).toBe(KIB);
+    }
+  });
+
+  test('exactly 256 KiB → inline (boundary)', async () => {
+    const bytes = new Uint8Array(INLINE_THRESHOLD).fill(0xcd);
+    const decision = await decideInline(bytes);
+    expect(decision.kind).toBe('inline');
+  });
+
+  test('256 KiB + 1 → streams (boundary +1)', async () => {
+    const bytes = new Uint8Array(INLINE_THRESHOLD + 1).fill(0xef);
+    const decision = await decideInline(bytes);
+    expect(decision.kind).toBe('streams');
+    if (decision.kind === 'streams') {
+      expect(decision.size).toBe(INLINE_THRESHOLD + 1);
+      const drained = await drainStream(decision.stream);
+      expect(drained.byteLength).toBe(INLINE_THRESHOLD + 1);
+    }
+  });
+});
+
+describe('decideInline (Blob)', () => {
+  test('small Blob → inline + propagates contentType', async () => {
+    const blob = new Blob([new Uint8Array(100).fill(7)], { type: 'application/octet-stream' });
+    const decision = await decideInline(blob);
+    expect(decision.kind).toBe('inline');
+    if (decision.kind === 'inline') {
+      expect(decision.contentType).toBe('application/octet-stream');
+      expect(decision.bytes.byteLength).toBe(100);
+    }
+  });
+
+  test('large Blob → streams + propagates size + contentType', async () => {
+    const big = new Uint8Array(INLINE_THRESHOLD + KIB).fill(1);
+    const blob = new Blob([big], { type: 'image/png' });
+    const decision = await decideInline(blob);
+    expect(decision.kind).toBe('streams');
+    if (decision.kind === 'streams') {
+      expect(decision.size).toBe(big.byteLength);
+      expect(decision.contentType).toBe('image/png');
+    }
+  });
+
+  test('empty Blob.type → no contentType', async () => {
+    const blob = new Blob([new Uint8Array(10)]);
+    const decision = await decideInline(blob);
+    expect(decision.kind).toBe('inline');
+    if (decision.kind === 'inline') {
+      expect(decision.contentType).toBeUndefined();
+    }
+  });
+});
+
+describe('decideInline (ReadableStream — bare)', () => {
+  test('EOF before threshold → inline', async () => {
+    const stream = streamOf(new Uint8Array(100), new Uint8Array(200));
+    const decision = await decideInline(stream);
+    expect(decision.kind).toBe('inline');
+    if (decision.kind === 'inline') {
+      expect(decision.bytes.byteLength).toBe(300);
+    }
+  });
+
+  test('crosses threshold mid-chunk → streams + remainder available', async () => {
+    // 256 KiB + 1 byte across two chunks
+    const a = new Uint8Array(200 * KIB).fill(0x10);
+    const b = new Uint8Array(100 * KIB).fill(0x20);
+    const stream = streamOf(a, b);
+    const decision = await decideInline(stream);
+    expect(decision.kind).toBe('streams');
+    if (decision.kind === 'streams') {
+      const drained = await drainStream(decision.stream);
+      expect(drained.byteLength).toBe(a.byteLength + b.byteLength);
+      expect(drained[0]).toBe(0x10);
+      expect(drained[drained.length - 1]).toBe(0x20);
+    }
+  });
+
+  test('empty stream → inline (zero bytes)', async () => {
+    const stream = streamOf();
+    const decision = await decideInline(stream);
+    expect(decision.kind).toBe('inline');
+    if (decision.kind === 'inline') {
+      expect(decision.bytes.byteLength).toBe(0);
+    }
+  });
+});
+
+describe('decideInline ({ stream, size })', () => {
+  test('declared size ≤ threshold → inline', async () => {
+    const bytes = new Uint8Array(KIB).fill(9);
+    const decision = await decideInline({ stream: streamOf(bytes), size: KIB, contentType: 'text/plain' });
+    expect(decision.kind).toBe('inline');
+    if (decision.kind === 'inline') {
+      expect(decision.bytes.byteLength).toBe(KIB);
+      expect(decision.contentType).toBe('text/plain');
+    }
+  });
+
+  test('declared size > threshold → streams', async () => {
+    const big = new Uint8Array(500 * KIB).fill(2);
+    const decision = await decideInline({ stream: streamOf(big), size: big.byteLength });
+    expect(decision.kind).toBe('streams');
+    if (decision.kind === 'streams') {
+      expect(decision.size).toBe(big.byteLength);
+    }
+  });
+});
+
+describe('decideInline (errors)', () => {
+  test('unsupported input throws TypeError', async () => {
+    await expect(decideInline(42 as unknown as Uint8Array)).rejects.toThrow(TypeError);
+  });
+});

packages/shade-files/tests/unit/path-policy.test.ts

@@ -0,0 +1,128 @@
+import { describe, test, expect } from 'bun:test';
+import * as fc from 'fast-check';
+import { validatePath } from '../../src/index.js';
+
+describe('validatePath — happy path', () => {
+  test('accepts simple absolute paths', () => {
+    expect(validatePath('/foo')).toEqual({ ok: true, normalized: '/foo' });
+    expect(validatePath('/foo/bar/baz.txt')).toEqual({
+      ok: true,
+      normalized: '/foo/bar/baz.txt',
+    });
+    expect(validatePath('/')).toEqual({ ok: true, normalized: '/' });
+  });
+
+  test('normalizes redundant slashes and dots', () => {
+    expect(validatePath('//foo//bar/./baz/').normalized).toBe('/foo/bar/baz');
+    expect(validatePath('/./foo').normalized).toBe('/foo');
+  });
+
+  test('UTF-8 paths are accepted', () => {
+    expect(validatePath('/Документы/файл.txt').normalized).toBe('/Документы/файл.txt');
+    expect(validatePath('/絵文字 😀/foo').normalized).toBe('/絵文字 😀/foo');
+  });
+});
+
+describe('validatePath — security', () => {
+  test('rejects raw `..` segments', () => {
+    expect(validatePath('/../etc/passwd').ok).toBe(false);
+    expect(validatePath('/foo/../etc').ok).toBe(false);
+    expect(validatePath('/..').ok).toBe(false);
+  });
+
+  test('rejects percent-encoded `..`', () => {
+    expect(validatePath('/%2e%2e/etc').ok).toBe(false);
+    expect(validatePath('/foo/%2E%2E/etc').ok).toBe(false);
+  });
+
+  test('rejects forbidden control bytes', () => {
+    expect(validatePath('/foo\x00bar').ok).toBe(false);
+    expect(validatePath('/foo\r\nbar').ok).toBe(false);
+    expect(validatePath('/foo\x7f').ok).toBe(false);
+    expect(validatePath('/foo\x01').ok).toBe(false);
+  });
+
+  test('rejects backslashes (Windows-style)', () => {
+    expect(validatePath('/foo\\bar').ok).toBe(false);
+  });
+
+  test('rejects relative paths', () => {
+    expect(validatePath('foo').ok).toBe(false);
+    expect(validatePath('./foo').ok).toBe(false);
+    expect(validatePath('').ok).toBe(false);
+  });
+
+  test('rejects over-length paths', () => {
+    expect(validatePath('/' + 'a'.repeat(4096)).ok).toBe(false);
+    expect(validatePath('/foobar', { maxLength: 5 }).ok).toBe(false);
+    expect(validatePath('/abc', { maxLength: 5 }).ok).toBe(true);
+  });
+});
+
+describe('validatePath — rootScope', () => {
+  test('accepts paths inside scope', () => {
+    expect(
+      validatePath('/srv/data/foo', { rootScope: '/srv/data' }).ok,
+    ).toBe(true);
+    expect(validatePath('/srv/data', { rootScope: '/srv/data' }).ok).toBe(true);
+  });
+
+  test('rejects paths outside scope', () => {
+    expect(validatePath('/etc/passwd', { rootScope: '/srv/data' }).ok).toBe(false);
+    expect(validatePath('/srv/dataX', { rootScope: '/srv/data' }).ok).toBe(false);
+    // Boundary check: /srv/database is NOT inside /srv/data
+    expect(validatePath('/srv/database/x', { rootScope: '/srv/data' }).ok).toBe(false);
+  });
+});
+
+describe('validatePath — extra hook', () => {
+  test('extra reject takes precedence', () => {
+    const result = validatePath('/secret/foo', {
+      extra: (p) => (p.includes('secret') ? 'reject' : 'allow'),
+    });
+    expect(result.ok).toBe(false);
+  });
+
+  test('extra allow is the default', () => {
+    expect(
+      validatePath('/foo', {
+        extra: () => 'allow',
+      }).ok,
+    ).toBe(true);
+  });
+});
+
+describe('validatePath — property-based', () => {
+  test('any string with a forbidden control byte is rejected', () => {
+    fc.assert(
+      fc.property(
+        fc.string({ minLength: 1, maxLength: 100 }),
+        fc.constantFrom('\x00', '\x07', '\x0a', '\x0d', '\x7f', '\\'),
+        (prefix, bad) => {
+          const p = `/${prefix}${bad}`;
+          expect(validatePath(p).ok).toBe(false);
+        },
+      ),
+      { numRuns: 200 },
+    );
+  });
+
+  test('any path inside rootScope normalizes within rootScope', () => {
+    fc.assert(
+      fc.property(
+        fc.array(fc.string({ minLength: 1, maxLength: 20 }).filter(
+          (s) => /^[A-Za-z0-9_-]+$/.test(s),
+        ), { minLength: 1, maxLength: 5 }),
+        (segments) => {
+          const root = '/srv';
+          const path = `${root}/${segments.join('/')}`;
+          const r = validatePath(path, { rootScope: root });
+          if (r.ok) {
+            expect(r.normalized.startsWith(root)).toBe(true);
+          }
+        },
+      ),
+      { numRuns: 200 },
+    );
+  });
+});

packages/shade-files/tests/unit/rate-limiter.test.ts

@@ -0,0 +1,91 @@
+import { describe, test, expect } from 'bun:test';
+import {
+  FsRateLimitError,
+  QuotaExceededError,
+  RateLimiter,
+} from '../../src/index.js';
+
+describe('RateLimiter — op bucket', () => {
+  test('allows up to capacity then rejects', () => {
+    const rl = new RateLimiter({ maxOpsPerMinutePerSender: 5, opCost: { default: 1 } });
+    for (let i = 0; i < 5; i++) rl.acquire('alice', 'list');
+    expect(() => rl.acquire('alice', 'list')).toThrow(FsRateLimitError);
+  });
+
+  test('rejection includes retryAfterMs', () => {
+    const rl = new RateLimiter({ maxOpsPerMinutePerSender: 1, opCost: { default: 1 } });
+    rl.acquire('alice', 'list');
+    try {
+      rl.acquire('alice', 'list');
+      throw new Error('expected throw');
+    } catch (err) {
+      expect(err).toBeInstanceOf(FsRateLimitError);
+      const payload = (err as FsRateLimitError).payload;
+      expect(payload.retryAfterMs).toBeGreaterThan(0);
+    }
+  });
+
+  test('different op costs respected', () => {
+    const rl = new RateLimiter({
+      maxOpsPerMinutePerSender: 10,
+      opCost: { write: 5, default: 1 },
+    });
+    rl.acquire('alice', 'write'); // 10 - 5 = 5 left
+    rl.acquire('alice', 'write'); // 5 - 5 = 0 left
+    expect(() => rl.acquire('alice', 'write')).toThrow(FsRateLimitError);
+  });
+
+  test('per-sender isolation', () => {
+    const rl = new RateLimiter({ maxOpsPerMinutePerSender: 1 });
+    rl.acquire('alice', 'list');
+    rl.acquire('bob', 'list'); // bob's bucket independent
+    expect(() => rl.acquire('alice', 'list')).toThrow(FsRateLimitError);
+    expect(() => rl.acquire('bob', 'list')).toThrow(FsRateLimitError);
+  });
+
+  test('release returns tokens', () => {
+    const rl = new RateLimiter({ maxOpsPerMinutePerSender: 1 });
+    rl.acquire('alice', 'list');
+    rl.release('alice', 'list');
+    rl.acquire('alice', 'list'); // should succeed again
+  });
+});
+
+describe('RateLimiter — byte bucket', () => {
+  test('quota exceeded triggers QuotaExceededError', () => {
+    const rl = new RateLimiter({ maxBytesPerHourPerSender: 1000 });
+    rl.acquire('alice', 'write', 600);
+    rl.acquire('alice', 'write', 400);
+    expect(() => rl.acquire('alice', 'write', 1)).toThrow(QuotaExceededError);
+  });
+
+  test('reconcile returns over-reserved bytes', () => {
+    const rl = new RateLimiter({ maxBytesPerHourPerSender: 1000 });
+    rl.acquire('alice', 'write', 800);
+    rl.reconcile('alice', 800, 200); // we only used 200 of the 800 reserved
+    rl.acquire('alice', 'write', 600); // capacity now 400 + 600 = 1000, fits 600
+  });
+
+  test('release returns reserved bytes', () => {
+    const rl = new RateLimiter({ maxBytesPerHourPerSender: 100 });
+    rl.acquire('alice', 'read', 80);
+    rl.release('alice', 'read', 80);
+    rl.acquire('alice', 'read', 80);
+  });
+});
+
+describe('RateLimiter — refill', () => {
+  test('tokens refill over time', async () => {
+    const rl = new RateLimiter({
+      // 6000/min = 100/sec = 0.1/ms; in 50ms we refill 5
+      maxOpsPerMinutePerSender: 6000,
+      opCost: { default: 1 },
+    });
+    // Drain by 5
+    for (let i = 0; i < 5; i++) rl.acquire('alice', 'list');
+    const before = rl.snapshot('alice')!.ops;
+    await new Promise((r) => setTimeout(r, 50));
+    const after = rl.snapshot('alice')!.ops;
+    expect(after).toBeGreaterThan(before);
+  });
+});

packages/shade-files/tests/unit/schemas.test.ts

@@ -0,0 +1,350 @@
+import { describe, test, expect } from 'bun:test';
+import {
+  PathSchema,
+  RequestIdSchema,
+  CursorSchema,
+  Sha256HexSchema,
+  FileEntrySchema,
+  FileKindSchema,
+  ListPageSchema,
+  ListArgsSchema,
+  StatArgsSchema,
+  MkdirArgsSchema,
+  DeleteArgsSchema,
+  MoveArgsSchema,
+  ReadArgsSchema,
+  ReadResultSchema,
+  WriteArgsSchema,
+  GetThumbnailArgsSchema,
+  GetThumbnailResultSchema,
+  CustomArgsSchema,
+  RpcRequestSchema,
+  RpcResponseSchema,
+  RpcErrorSchema,
+  RpcCancelSchema,
+  FileErrorCodeSchema,
+  FileErrorPayloadSchema,
+} from '../../src/index.js';
+
+describe('PathSchema', () => {
+  test('accepts absolute paths', () => {
+    expect(PathSchema.parse('/foo')).toBe('/foo');
+    expect(PathSchema.parse('/foo/bar/baz.txt')).toBe('/foo/bar/baz.txt');
+    expect(PathSchema.parse('/')).toBe('/');
+  });
+  test('rejects relative paths', () => {
+    expect(() => PathSchema.parse('foo')).toThrow();
+    expect(() => PathSchema.parse('./foo')).toThrow();
+  });
+  test('rejects NUL/CR/LF/DEL/backslash', () => {
+    expect(() => PathSchema.parse('/foo\x00bar')).toThrow();
+    expect(() => PathSchema.parse('/foo\r\n')).toThrow();
+    expect(() => PathSchema.parse('/foo\x7f')).toThrow();
+    expect(() => PathSchema.parse('/foo\\bar')).toThrow();
+  });
+  test('rejects empty + over-length', () => {
+    expect(() => PathSchema.parse('')).toThrow();
+    expect(() => PathSchema.parse('/' + 'a'.repeat(4096))).toThrow();
+  });
+  test('accepts UTF-8 in filenames', () => {
+    expect(PathSchema.parse('/Документы/файл.txt')).toBe('/Документы/файл.txt');
+    expect(PathSchema.parse('/πρόβλημα/αρχείο')).toBe('/πρόβλημα/αρχείο');
+  });
+});
+
+describe('RequestIdSchema', () => {
+  test('accepts 22-char base64url', () => {
+    expect(RequestIdSchema.parse('AbCdEfGhIjKlMnOpQrStUv')).toBe('AbCdEfGhIjKlMnOpQrStUv');
+  });
+  test('rejects wrong length', () => {
+    expect(() => RequestIdSchema.parse('AbCd')).toThrow();
+    expect(() => RequestIdSchema.parse('AbCdEfGhIjKlMnOpQrStUvWxYz')).toThrow();
+  });
+  test('rejects non-base64url chars', () => {
+    expect(() => RequestIdSchema.parse('AbCd/EfGh+IjKlMnOpQrST')).toThrow();
+    expect(() => RequestIdSchema.parse('AbCd=EfGhIjKlMnOpQrSTUV')).toThrow();
+  });
+});
+
+describe('CursorSchema', () => {
+  test('accepts up to 2048 chars', () => {
+    expect(CursorSchema.parse('a')).toBe('a');
+    expect(CursorSchema.parse('x'.repeat(2048)).length).toBe(2048);
+  });
+  test('rejects empty + over-length', () => {
+    expect(() => CursorSchema.parse('')).toThrow();
+    expect(() => CursorSchema.parse('x'.repeat(2049))).toThrow();
+  });
+});
+
+describe('Sha256HexSchema', () => {
+  test('accepts 64 hex chars', () => {
+    const h = '0'.repeat(64);
+    expect(Sha256HexSchema.parse(h)).toBe(h);
+  });
+  test('rejects wrong length / non-hex', () => {
+    expect(() => Sha256HexSchema.parse('0'.repeat(63))).toThrow();
+    expect(() => Sha256HexSchema.parse('0'.repeat(65))).toThrow();
+    expect(() => Sha256HexSchema.parse('g'.repeat(64))).toThrow();
+    expect(() => Sha256HexSchema.parse('A'.repeat(64))).toThrow(); // uppercase rejected
+  });
+});
+
+describe('FileKind / FileEntry', () => {
+  test('FileKind accepts file/dir', () => {
+    expect(FileKindSchema.parse('file')).toBe('file');
+    expect(FileKindSchema.parse('dir')).toBe('dir');
+    expect(() => FileKindSchema.parse('symlink')).toThrow();
+  });
+  test('FileEntry roundtrip', () => {
+    const e = {
+      name: 'foo.txt',
+      kind: 'file' as const,
+      size: 1024,
+      mtime: 1730000000000,
+      contentType: 'text/plain',
+    };
+    const parsed = FileEntrySchema.parse(e);
+    expect(parsed.name).toBe('foo.txt');
+    expect(parsed.metadata).toEqual({}); // default
+  });
+  test('FileEntry rejects path separators in name', () => {
+    expect(() =>
+      FileEntrySchema.parse({ name: 'foo/bar', kind: 'file', size: 0, mtime: 0 }),
+    ).toThrow();
+    expect(() =>
+      FileEntrySchema.parse({ name: 'foo\\bar', kind: 'file', size: 0, mtime: 0 }),
+    ).toThrow();
+  });
+  test('FileEntry rejects negative size', () => {
+    expect(() =>
+      FileEntrySchema.parse({ name: 'a', kind: 'file', size: -1, mtime: 0 }),
+    ).toThrow();
+  });
+  test('FileEntry passes through metadata', () => {
+    const parsed = FileEntrySchema.parse({
+      name: 'mod.jar',
+      kind: 'file',
+      size: 100,
+      mtime: 0,
+      metadata: { modrinthId: 'abc', version: '1.0' },
+    });
+    expect(parsed.metadata).toEqual({ modrinthId: 'abc', version: '1.0' });
+  });
+});
+
+describe('ListPage', () => {
+  test('hasMore + nextCursor when more pages', () => {
+    const p = ListPageSchema.parse({
+      entries: [],
+      hasMore: true,
+      nextCursor: 'abc',
+    });
+    expect(p.hasMore).toBe(true);
+    expect(p.nextCursor).toBe('abc');
+  });
+  test('no nextCursor when hasMore false', () => {
+    const p = ListPageSchema.parse({ entries: [], hasMore: false });
+    expect(p.nextCursor).toBeUndefined();
+  });
+});
+
+describe('ListArgs', () => {
+  test('defaults pageSize to 100', () => {
+    const a = ListArgsSchema.parse({ path: '/foo' });
+    expect(a.pageSize).toBe(100);
+  });
+  test('rejects pageSize > 1000', () => {
+    expect(() => ListArgsSchema.parse({ path: '/foo', pageSize: 1001 })).toThrow();
+  });
+  test('rejects pageSize < 1', () => {
+    expect(() => ListArgsSchema.parse({ path: '/foo', pageSize: 0 })).toThrow();
+  });
+});
+
+describe('StatArgs', () => {
+  test('requires path', () => {
+    expect(() => StatArgsSchema.parse({})).toThrow();
+    expect(StatArgsSchema.parse({ path: '/foo' }).path).toBe('/foo');
+  });
+});
+
+describe('Mkdir/Delete/Move args', () => {
+  test('Mkdir defaults recursive=false', () => {
+    expect(MkdirArgsSchema.parse({ path: '/a' }).recursive).toBe(false);
+  });
+  test('Delete defaults recursive=false', () => {
+    expect(DeleteArgsSchema.parse({ path: '/a' }).recursive).toBe(false);
+  });
+  test('Move defaults overwrite=false', () => {
+    expect(
+      MoveArgsSchema.parse({ src: '/a', dst: '/b' }).overwrite,
+    ).toBe(false);
+  });
+});
+
+describe('ReadArgs / ReadResult', () => {
+  test('Read accepts optional range', () => {
+    const a = ReadArgsSchema.parse({ path: '/a', range: { start: 0, end: 100 } });
+    expect(a.range).toEqual({ start: 0, end: 100 });
+  });
+  test('ReadResult inline', () => {
+    const r = ReadResultSchema.parse({
+      kind: 'inline',
+      bytesB64: 'YQ==',
+      size: 1,
+      sha256: 'a'.repeat(64),
+    });
+    expect(r.kind).toBe('inline');
+  });
+  test('ReadResult streams', () => {
+    const r = ReadResultSchema.parse({
+      kind: 'streams',
+      streamId: 'sid-123',
+      size: 1024,
+      sha256: 'b'.repeat(64),
+    });
+    expect(r.kind).toBe('streams');
+  });
+  test('ReadResult rejects unknown kind', () => {
+    expect(() =>
+      ReadResultSchema.parse({ kind: 'magic', bytesB64: 'YQ==' }),
+    ).toThrow();
+  });
+});
+
+describe('WriteArgs', () => {
+  test('inline shape', () => {
+    const w = WriteArgsSchema.parse({
+      kind: 'inline',
+      path: '/foo',
+      bytesB64: 'YQ==',
+    });
+    expect(w.kind).toBe('inline');
+    if (w.kind === 'inline') expect(w.overwrite).toBe(false);
+  });
+  test('streams shape', () => {
+    const w = WriteArgsSchema.parse({
+      kind: 'streams',
+      path: '/foo',
+      size: 1000,
+      writeId: 'AbCdEfGhIjKlMnOpQrStUv',
+    });
+    if (w.kind === 'streams') expect(w.size).toBe(1000);
+  });
+});
+
+describe('GetThumbnailArgs / Result', () => {
+  test('size must be enum 64/128/256/512', () => {
+    expect(() => GetThumbnailArgsSchema.parse({ path: '/a', size: 100 })).toThrow();
+    expect(GetThumbnailArgsSchema.parse({ path: '/a', size: 64 }).size).toBe(64);
+  });
+  test('format defaults to png', () => {
+    const a = GetThumbnailArgsSchema.parse({ path: '/a', size: 128 });
+    expect(a.format).toBe('png');
+  });
+  test('Result requires width/height/sha256', () => {
+    const r = GetThumbnailResultSchema.parse({
+      bytesB64: 'YQ==',
+      format: 'png',
+      width: 128,
+      height: 128,
+      sha256: 'c'.repeat(64),
+    });
+    expect(r.width).toBe(128);
+  });
+});
+
+describe('CustomArgs', () => {
+  test('accepts dotted op names', () => {
+    expect(
+      CustomArgsSchema.parse({ name: 'dispatch.deploy-mod', payload: {} }).name,
+    ).toBe('dispatch.deploy-mod');
+  });
+  test('rejects names with spaces or slashes', () => {
+    expect(() => CustomArgsSchema.parse({ name: 'foo bar', payload: {} })).toThrow();
+    expect(() => CustomArgsSchema.parse({ name: 'foo/bar', payload: {} })).toThrow();
+  });
+});
+
+describe('RPC envelopes', () => {
+  test('RpcRequest valid', () => {
+    const env = RpcRequestSchema.parse({
+      kind: 'shade.fs.list/v1',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      args: { path: '/' },
+      sig: 'sig',
+      signedAt: 1730000000000,
+    });
+    expect(env.kind).toBe('shade.fs.list/v1');
+  });
+  test('RpcRequest rejects malformed kind', () => {
+    expect(() =>
+      RpcRequestSchema.parse({
+        kind: 'shade.fs.list',
+        id: 'AbCdEfGhIjKlMnOpQrStUv',
+        args: {},
+        sig: 's',
+        signedAt: 1,
+      }),
+    ).toThrow();
+  });
+  test('RpcResponse expects .response suffix', () => {
+    const env = RpcResponseSchema.parse({
+      kind: 'shade.fs.list/v1.response',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      result: { entries: [], hasMore: false },
+    });
+    expect(env.id.length).toBe(22);
+  });
+  test('RpcError fixed kind', () => {
+    const env = RpcErrorSchema.parse({
+      kind: 'shade.fs.error/v1',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      error: { code: 'NOT_FOUND', message: 'gone' },
+    });
+    expect(env.error.code).toBe('NOT_FOUND');
+  });
+  test('RpcCancel fixed kind', () => {
+    const env = RpcCancelSchema.parse({
+      kind: 'shade.fs.cancel/v1',
+      id: 'AbCdEfGhIjKlMnOpQrStUv',
+      reason: 'user-cancel',
+    });
+    expect(env.reason).toBe('user-cancel');
+  });
+});
+
+describe('FileError envelope', () => {
+  test('all known codes parse', () => {
+    const codes: ReadonlyArray<unknown> = [
+      'NOT_FOUND',
+      'PERMISSION_DENIED',
+      'CONFLICT',
+      'QUOTA_EXCEEDED',
+      'RATE_LIMIT',
+      'PATH_VALIDATION',
+      'FINGERPRINT_REQUIRED',
+      'OPERATION_TIMEOUT',
+      'IDEMPOTENCY_CONFLICT',
+      'CANCELLED',
+      'INTERNAL',
+      'NOT_IMPLEMENTED',
+      'CUSTOM_OP_REJECTED',
+      'INVALID_SIGNATURE',
+      'INVALID_ARGS',
+    ];
+    for (const c of codes) expect(FileErrorCodeSchema.parse(c)).toBe(c);
+  });
+  test('rejects unknown code', () => {
+    expect(() => FileErrorCodeSchema.parse('NOT_REAL')).toThrow();
+  });
+  test('FileErrorPayload includes optional fields', () => {
+    const p = FileErrorPayloadSchema.parse({
+      code: 'RATE_LIMIT',
+      message: 'too fast',
+      retryAfterMs: 1000,
+    });
+    expect(p.retryAfterMs).toBe(1000);
+  });
+});