Третий класс петли (инцидент 2026-07-10): ран упёрся в 20-шаговый кап, спалив
все шаги на чтение; на 20-м шаге final-step lockdown отнял инструменты
(toolChoice:'none') посреди незаконченной работы → модель выродилась в
текст-повтор («loadTools.» ×20416, 255КБ). Пакет защит по дизайну владельца:
- MAX_AGENT_STEPS 20→50; спеки выводятся из константы (нет захардкоженных 19/20).
- Final-step lockdown под env-тогглом AI_CHAT_FINAL_STEP_LOCKDOWN (дефолт OFF,
по образцу AI_CHAT_DEFERRED_TOOLS): OFF — инструменты доступны на всех шагах +
мягкий финальный нудж; ON — легаси toolChoice:'none'+FINAL_STEP_INSTRUCTION.
Спеки параметризованы по тогглу. .env.example задокументирован.
- Пустой ход (все шаги без текста, шаги исчерпаны) получает синтетический
маркер-текст — виден в UI и реплее.
- Детектор токен-деградации в onChunk (единственная защита от болтовни, БЕЗ
maxOutputTokens — tool-аргументы это выходные токены): чистые правила
(≥25 одинаковых строк ИЛИ периодический хвост), при срабатывании abort через
внутренний AbortController ∪ effectiveSignal (AbortSignal.any), финализация в
onAbort: усечение хвоста, ai_chat_runs.error=Output degeneration detected,
лизы MCP/снапшоты освобождаются (существующий lifecycle).
- Предупреждение о бюджете шагов на MAX-6…MAX-2 с убывающим N.
- loadTools-описание и преамбула каталога явно говорят, что CORE-тулы всегда
активны (список из CORE_TOOL_KEYS динамически).
Внутренний цикл: 2 прохода. Ревью нашло data-loss-риск: правило периодичности
детектора ложно срабатывало на markdown-разделителях/setext-подчёркиваниях/
хвостовых пробелах (монохар-хвост p-периодичен при ЛЮБОМ p → ложный abort с
пометкой error и усечением). Починка: отдельная монохар-проверка (порог 60,
выше любого реального разделителя) + требование ≥2 различных символов в
периодическом блоке при p≥2. Реальный loadTools-цикл (период ~10) ловится.
Мутационно: 59 одинаковых — не флаг, 60 — флаг; loadTools×20416 — флаг.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Mandatory (test-coverage):
- internal-file-urls.test: pin the SSRF/traversal ACCEPT path of
resolveInternalFilePath (the sole guard for content-controlled `src`): an
absolute/protocol-relative URL has its foreign host dropped and only an
/api/files/ pathname survives (http://evil.com/api/files/x/y.png -> /files/x/y.png),
while a host-dropped path that escapes /api/files/ (https://evil.com/api/auth/whoami)
or a backslash-traversal (/api/files\..\auth\whoami) is rejected. Locks the
behavior so a future prefix-only refactor cannot silently open a bypass.
Suggestions:
- index.ts: the stash_page MCP tool now returns structuredContent
{ uri, sha256, size, images } alongside the resource_link, so the MCP output
matches the documented shape (clients get the blob's sha256/ETag and the
mirror counts, not just the link). No outputSchema registered. Rebuilt build/.
- new stash-page-mcp-result.test: server round-trip via InMemoryTransport asserts
both the resource_link and the structuredContent mirror.
- internal-file-urls.test: cover the new URL parse-failure catch branch
(http://[ -> "Invalid internal file src").
- environment.service.spec: assert getPositiveIntEnv warns once per key and
independently across keys (the invalidPositiveIntWarned dedup).
Tests: packages/mcp 383 pass; apps/server sandbox/environment/mcp 235 pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Must-fix:
- mcp.module: drop the now-dead EnvironmentModule import (and its stale
comment). McpService no longer injects EnvironmentService; EnvironmentModule
is @Global and imported at the app root, so DI still resolves.
Stability:
- environment.service: route getSandboxTtlMs + the three SANDBOX_MAX_*_BYTES
caps through a shared getPositiveIntEnv() helper that warns once per key and
falls back to the default on a non-integer or <= 0 value (previously the byte
caps did a bare parseInt, so SANDBOX_MAX_TOTAL_BYTES=0 made every stash_page
fail against a 0-byte cap). TTL behavior is unchanged.
Simplification:
- sandbox.controller: replace the homemade UUID_RE with the project's shared
`uuid` validator (import { validate as isValidUUID } from 'uuid'), matching
the attachment routes; update the spec fixtures to valid v4 UUIDs.
- mcp.service: inline the single-caller one-liner buildSandboxConfig() to
this.sandboxStore.asSink() at the wiring site.
Docs:
- CHANGELOG: add an [Unreleased] > Added entry for #243 (stash_page tool,
anonymous GET /api/sb/:id, five SANDBOX_* env vars).
- AGENTS.md: note that GET /api/sb/:id is in the workspace-gate preHandler's
excludedPaths and is fully tokenless, unlike /api/files/public/... which
still resolves a workspace and needs an attachment JWT.
Tests: cap-getter validation (0/-5/abc -> default, valid -> parsed), updated
UUID fixtures. apps/server jest sandbox/environment/mcp: 233 pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Security (must-fix):
- sandbox.controller: the anonymous GET /api/sb/:id response now sets
X-Content-Type-Options: nosniff, a restrictive CSP, and Content-Disposition=
attachment for any mime outside a raster-image allowlist (png/jpeg/gif/webp/
avif). entry.mime is attacker-controlled, so an evil.svg/evil.html could
otherwise execute script inline on the Docmost origin (stored XSS). Mirrors
the public attachment route's hardening.
Stability:
- client.stashPage: reconcile mirrors AFTER the final document put, not only
before it. The doc blob is the newest entry and FIFO eviction drops the
oldest = this stash's own images, so the stored doc could reference an
evicted blob (consumer 404) and over-report images.mirrored. A bounded loop
now reverts doc-put-evicted mirrors, drops the stale doc blob, and re-puts
until stable. Regenerated packages/mcp/build/.
- sandbox.controller: emit Cache-Control on the 304 branch too (ttlSeconds is
computed before the conditional check).
Docs:
- Bump the MCP tool count 39 -> 40 across all READMEs and AGENTS.md (the
registry now exposes exactly 40 tools).
Refactor:
- SandboxStore.asSink() centralizes the {put,has,evict} sink + uri<->id
mapping; the embedded-MCP and in-app agent-tools wiring sites share it.
Tests:
- security headers (inline vs attachment, nosniff, CSP), 304 Cache-Control,
putAndLink URL form, has()/remove(), asSink() round-trip, getSandboxPublicUrl
(trailing-slash trim + APP_URL fallback), and a stash test where the doc put
itself evicts a mirrored image.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Security:
- stash_page: reject path-traversal / percent-encoded srcs before the authed
loopback fetch (resolveInternalFilePath), closing an SSRF/exfiltration hole
where a crafted node.attrs.src could read an arbitrary internal GET endpoint
into the anonymous sandbox.
Stability:
- stash_page: revert + recount mirrors FIFO-evicted by a later put in the same
stash (no dangling sandbox refs, honest images.mirrored/failed); free image
blobs if the final document put throws.
- Reject/clamp non-positive SANDBOX_TTL_MS to the 1h default (warn once).
- Log mirror failures unconditionally (console.warn, no blob bodies).
Cleanup / architecture:
- Remove dead expiresAt from SandboxPutResult.
- Centralize the /api/sb route in SANDBOX_ROUTE_SEGMENT/SANDBOX_API_PATH and
move URL composition into SandboxStore.putAndLink; drop the duplicated sink
closures and the now-unused EnvironmentService injection from McpService and
AiChatToolsService.
- Un-export isInternalFileUrl; document the process-local (instance-bound)
sandbox limitation in the tool description and .env.example.
Docs/tests:
- README/README.ru: 38 -> 39 tools + stash_page entry.
- Add traversal/normalize/recursion unit tests, stash self-eviction +
doc-put-throw + empty/octet-stream mock tests, controller If-None-Match
(wildcard/weak/list) + Cache-Control tests, and SANDBOX_TTL_MS validation
tests. Regenerate packages/mcp/build.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
16 suites were disabled via testPathIgnorePatterns due to two root causes: lib0
ESM not transformed (the @hocuspocus/server -> lib0/decoding.js chain) and stock
'should be defined' specs built via Test.createTestingModule without providers.
Add lib0 to transformIgnorePatterns; convert the 14 DI placeholders to direct
new X(...) instantiation with stub deps (keeping a real construct smoke test);
re-enable the suites. Also updates the public-share limiter test to assert the
fail-closed behavior from #62 (surfaced now that the suite runs). Full server
suite: 67 passed, 689 tests.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
agent_coder
claude_code
Philipinho
