fix: harden parser, lifecycle, executor, fs, fetch, and gateway paths from the astra-6 audit - #290
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… from the astra-6 audit Verified the 36-item audit against the checkout and fixed the confirmed defects, each with a regression test that fails on the previous code. Parser (F01-F08): rewrite the DSML/Hermes stream parser as a chunk-invariant state machine with fence awareness, strict invoke bodies, null-prototype argument objects, tag/envelope budgets, linear scanning, and stream/non-stream text parity; native tool calls now win over recovered content calls in all three OpenAI-compatible adapters; both parser copies are held byte-identical by a drift test. Lifecycle (F09, F10, F12-F14, F24): launching prompts are owned by abort/drain/clear, compaction no longer recurses through the launch finally, agent removal is memoized and phase-isolated with a quiescence guard and dispatcher flush, failed creation unregisters its metadata, and metadata publishes memory only after the store write succeeds. Executor (F15-F17, F30): the scheduler keeps a resource lease until an abandoned execution settles, including across batches, caps unrelated concurrency, checks the abort signal before resolution, and classifies telemetry from execution state instead of output text. Filesystem and web (F18-F21): read/write deny aliases whose real target is sensitive, overwrites are atomic replacements that keep symlinks and modes, line reads are bounded per line, and web fetches stop at the byte cap while streaming. Gateway (F26-F29): close is memoized and runs every phase, WebSocket gets a payload cap, control-queue and subscription budgets, a hard slow-consumer bound, and closed-connection rechecks after async subscribe. Subagents (F23): run completion reports per-run usage and exposes the cumulative total separately.
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Included review availability: 2 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 3 reviews per hour. 📝 WalkthroughWalkthroughThis pull request adds cancellation tracking, bounded tool and network reads, atomic file writes, sensitive-path checks, chunk-invariant DSML parsing, lifecycle cleanup coordination, usage deltas, and WebSocket limits. ChangesAgent execution control
DSML tool-call parsing
Filesystem and fetch boundaries
Session lifecycle and usage
Gateway resilience
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🟡 Moderate · up to This change improves parsing, execution, filesystem, and gateway safeguards, but unresolved edge cases can still cause blocked prompt processing, incorrect file behavior, or lost streamed response content. Resolve these issues before merging. Sequence Diagram(s)sequenceDiagram
participant Provider
participant DsmlStreamParser
participant NativeToolCalls
participant ToolCallOutput
Provider->>DsmlStreamParser: feed streamed response chunks
DsmlStreamParser->>ToolCallOutput: buffer recovered DSML calls
Provider->>NativeToolCalls: emit native tool-call deltas
NativeToolCalls->>ToolCallOutput: emit native calls immediately
DsmlStreamParser->>ToolCallOutput: emit buffered DSML calls only without native calls
sequenceDiagram
participant Client
participant WsConnectionV1
participant Broadcaster
Client->>WsConnectionV1: attach sessions and send controls
WsConnectionV1->>Broadcaster: subscribe session
Broadcaster-->>WsConnectionV1: outbound frame
WsConnectionV1->>Client: send frame or close overloaded connection
🚥 Pre-merge checks | ✅ 2 | ❌ 3❌ Failed checks (3 warnings)
✅ Passed checks (2 passed)
Full details: Description checkExplanation The description clearly explains the problem, changes, tests, and validation results. However, it does not link the required related issue, and the checklist confirms that the issue requirement is incomplete for this external PR.
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Actionable comments posted: 17
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Inline comments:
In `@packages/agent-core-v2/src/agent/prompt/promptService.ts`:
- Line 543: Update the active-state handling around startNext so it does not
call startNext again when compaction is active; defer resumption exclusively to
onDidFinishCompaction, while preserving the existing immediate restart behavior
when compaction is not blocking launches.
In `@packages/agent-core-v2/src/agent/tools/os/read/readTool.ts`:
- Line 308: Update HostFileSystem._readUtf8Lines, used by fs.readLines, to trim
the retained byte buffer to the last complete UTF-8 code-point boundary before
strict decoding when maxLineBytes truncates it; preserve valid content and
strict rejection of genuinely invalid UTF-8, and add a regression case where the
limit falls inside a multibyte character.
In `@packages/agent-core-v2/src/kosong/provider/bases/openai/openai-legacy.ts`:
- Around line 500-504: Update the streaming handling around the recovered DSML
function-part branch in
packages/agent-core-v2/src/kosong/provider/bases/openai/openai-legacy.ts lines
500-504 to retain or re-emit the original DSML text when native tool-call
precedence suppresses recovered calls. Apply the same behavior in
packages/kosong/src/providers/openai-legacy.ts lines 487-491, and add a
streaming assertion confirming DSML text is preserved.
In `@packages/agent-core-v2/src/os/backends/node-local/hostFsService.ts`:
- Line 77: Update the write path around atomicWrite so Windows replacements use
a primitive that retains the existing destination until the staged file is
successfully installed, preserving the prior file on replacement failure. Add a
Windows-specific regression test covering a failed replacement and verify the
original content remains unchanged.
- Line 77: Update atomicWrite to explicitly call the file handle’s chmod with
the requested mode before syncing whenever mode is defined, ensuring staged
files retain group-write permissions despite the process umask. Add a regression
test covering group-write permission preservation.
- Line 155: Update the retained-prefix logic around the kept buffer so the byte
limit is reduced to the end of the last complete UTF-8 code point before strict
decoding, while preserving the existing limit for ASCII and already-complete
sequences. Add a test covering truncation inside a multibyte character, such as
the described euro-sign input.
- Line 117: Update readLines to enforce maxLineBytes for every supported
encoding: stream non-UTF-8 inputs with the same per-line limit, or explicitly
reject maxLineBytes when the requested encoding is not UTF-8; do not allow the
current complete-file read path to yield unbounded lines.
In `@packages/agent-core-v2/src/tool/path-access.ts`:
- Around line 265-266: Update the path handling around resolveRealTarget and the
ReadTool/WriteTool filesystem operations so target resolution, sensitive-file
validation, and I/O use the same bound descriptor or no-follow operation. Remove
the check-only validation followed by reopening safePath, preventing symlink
replacement races from redirecting reads or writes.
In `@packages/agent-core-v2/test/agent/prompt/promptService.test.ts`:
- Line 309: Remove the type assertions around the compaction test state and add
typed test-harness controls for the required compaction state instead. Trigger
compaction resumption through the public compaction callback rather than
accessing private startNext(), while preserving the test’s existing behavior for
the pending promise and abort controller.
In `@packages/agent-core-v2/test/agent/toolExecutor/toolScheduler.test.ts`:
- Line 259: Remove the vacuous expect(drained).toEqual([]) assertion from the
tool scheduler test; retain the started assertion, which already verifies that
the follower remains queued before collectResults() runs.
In
`@packages/agent-core-v2/test/kosong/provider/dsml-tool-parser-conformance.test.ts`:
- Around line 323-324: Update the parity test’s path resolution around the
`here` and `legacy` constants to derive the test directory from
`import.meta.url` using ESM-compatible URL/path utilities, then resolve both
parser paths from that directory without relying on `__dirname`.
In `@packages/agent-core-v2/test/session/sessionMetadata/sessionMetadata.test.ts`:
- Line 241: Make the timestamp regression test deterministic around
unregisterAgent by controlling the clock so Date.now() returns a value greater
than before before invoking it, then restore the original clock afterward; keep
the updatedAt assertion meaningful and ensure cleanup occurs even if the test
fails.
In `@packages/agent-core-v2/test/session/subagent/runAgentTurn.test.ts`:
- Line 24: Replace the `as never` assertion in the mocked Turn result and the
`as unknown as IAgentScopeHandle` assertion in the scope-handle fixture with
properly typed test fixtures that satisfy their respective contracts. Preserve
the existing test behavior while ensuring TypeScript validates both the result
and scope handle directly.
In `@packages/agent-gateway/src/start.ts`:
- Around line 320-326: Update the shutdown cleanup around
configWarningSubscription, pluginChangeSubscription,
capabilityInstallSubscription, authFailureLimiter, and
modelCatalogRefreshScheduler so each disposal runs in an independent phase or
otherwise continues after an earlier disposal error. Ensure every registered
resource is attempted during shutdown even when
configWarningSubscription.dispose() or another disposal throws.
In `@packages/agent-gateway/test/wsConnectionV1.test.ts`:
- Around line 76-78: Update withBroadcaster to type overrides as a
Partial<Pick<SessionEventBroadcaster, ...>> containing the overridden
broadcaster methods, then return Object.assign(makeBroadcaster(), overrides)
directly. Remove the Record<string, unknown> conversion and both type
assertions.
In `@packages/kosong/src/providers/pythinker.ts`:
- Around line 445-449: Update _convertStreamResponse so recovered DSML function
parts and their original envelope text are preserved even when native
delta.tool_calls are detected; do not discard recoveredToolCalls solely because
nativeToolCallsSeen is true, while retaining native tool-call emission.
In `@packages/kosong/test/openai-legacy.test.ts`:
- Around line 1542-1544: Update the mock setup for
provider._client.chat.completions.create to remove the any assertion and use a
narrow unknown-based test seam type that preserves type checking for the client
and create mock. Keep the existing mockedStream behavior unchanged.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (51)
.changeset/atomic-file-writes.md.changeset/cancel-prompt-while-starting.md.changeset/dsml-parser-chunk-invariance.md.changeset/sensitive-file-symlink-alias.md.changeset/subagent-usage-per-run.md.changeset/tool-cancel-holds-file-lease.md.changeset/web-fetch-streaming-limit.mdpackages/agent-core-v2/src/agent/prompt/promptService.tspackages/agent-core-v2/src/agent/toolExecutor/toolExecutorService.tspackages/agent-core-v2/src/agent/toolExecutor/toolScheduler.tspackages/agent-core-v2/src/agent/tools/os/read/readTool.tspackages/agent-core-v2/src/agent/tools/os/write/writeTool.tspackages/agent-core-v2/src/app/web/providers/local-fetch-url.tspackages/agent-core-v2/src/kosong/contract/usage.tspackages/agent-core-v2/src/kosong/provider/bases/openai/dsml-tool-parser.tspackages/agent-core-v2/src/kosong/provider/bases/openai/openai-legacy.tspackages/agent-core-v2/src/os/backends/node-local/hostFsService.tspackages/agent-core-v2/src/os/interface/hostFileSystem.tspackages/agent-core-v2/src/session/agentLifecycle/agentLifecycleService.tspackages/agent-core-v2/src/session/agentLifecycle/managedAgent.tspackages/agent-core-v2/src/session/expertTalk/expertTalkService.tspackages/agent-core-v2/src/session/sessionMetadata/sessionMetadata.tspackages/agent-core-v2/src/session/sessionMetadata/sessionMetadataService.tspackages/agent-core-v2/src/session/subagent/runAgentTurn.tspackages/agent-core-v2/src/session/subagent/subagent.tspackages/agent-core-v2/src/tool/path-access.tspackages/agent-core-v2/test/agent/prompt/promptService.test.tspackages/agent-core-v2/test/agent/toolExecutor/toolExecutor.test.tspackages/agent-core-v2/test/agent/toolExecutor/toolScheduler.test.tspackages/agent-core-v2/test/app/sessionExport/sessionExport.test.tspackages/agent-core-v2/test/app/web/providers/local-fetch-url.test.tspackages/agent-core-v2/test/features/dynamic_workflow/sessionDynamicWorkflow.test.tspackages/agent-core-v2/test/features/externalHooks/integration.test.tspackages/agent-core-v2/test/kosong/provider/dsml-tool-parser-conformance.test.tspackages/agent-core-v2/test/kosong/provider/dsml-tool-parser.test.tspackages/agent-core-v2/test/os/backends/node-local/hostFsService.test.tspackages/agent-core-v2/test/os/backends/node-local/tools/read.test.tspackages/agent-core-v2/test/os/backends/node-local/tools/write.test.tspackages/agent-core-v2/test/session/agentLifecycle/agentLifecycle.test.tspackages/agent-core-v2/test/session/sessionMetadata/sessionMetadata.test.tspackages/agent-core-v2/test/session/subagent/runAgentTurn.test.tspackages/agent-core-v2/test/tool/tool.test.tspackages/agent-gateway/src/start.tspackages/agent-gateway/src/transport/ws/v1/registerWsV1.tspackages/agent-gateway/src/transport/ws/v1/wsConnectionV1.tspackages/agent-gateway/test/boot.test.tspackages/agent-gateway/test/wsConnectionV1.test.tspackages/kosong/src/providers/dsml-tool-parser.tspackages/kosong/src/providers/openai-legacy.tspackages/kosong/src/providers/pythinker.tspackages/kosong/test/openai-legacy.test.ts
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Related Issue
No linked issue. This change comes from the external
astra-6audit package (baseline b12dfa1, 36 findings), which was verified item by item against the checkout before any code changed.Problem
The audit reproduced real defects in the leaked-tool-call parser and in several lifecycle, executor, filesystem, fetch, and gateway paths:
What changed
Every fix ships with a regression test that was proven to fail on the previous code (stash and re-run).
agent-core-v2and the byte-identicalkosongcopy, guarded by a drift test): rewritten as a chunk-invariant state machine. Cursor-based scanning, sticky regexes, bounded tail, markdown fence awareness, container hold that restores tags as text when no call is produced, strict invoke-body parsing with null-prototype args, tag and envelope budgets. New conformance corpus covers every two-way split, char-at-a-time, and seeded random partitions over 28 fixtures with stream/non-stream parity. Native tool calls now take precedence over recovered content calls in all three OpenAI-style adapters.removeis memoized, runs every phase and aggregates failures, takes a quiescence guard, and flushes the dispatcher. Failed creation unregisters metadata. Metadata persists before it publishes.Deliberately not changed (existing tests codify current behavior, or a policy decision is needed): gateway
uncaughtExceptionlog-and-continue, proxy mode dropping IP pinning, hook and resolver deadlines,settled()semantics, and the@types/nodemajor bump.Gates: typecheck and lint green, leak check A-D clean (E-G at the known baseline), full suite green except load-induced phantoms that pass in isolation and sit outside touched files.
Checklist
/approve).gen-changesetsskill, or this PR needs no changeset.gen-docsskill, or this PR needs no doc update.Summary by CodeRabbit
Bug Fixes
Improvements