build(agents): build and publish the Buzz agent and relay images from this repository - #44

🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Add voltage/images/test-relay-image.sh to the relay filter.

The relay filter lists only the root Dockerfile inputs and the workflow file. The top-level push and pull_request triggers include voltage/images/**, so a change to voltage/images/test-relay-image.sh starts the workflow. The agent and reaper filters do not match that path, and neither does relay. changes.outputs.any is therefore false, and the build job is skipped.

A pull request that edits only the relay smoke script never runs it. A broken script can merge unnoticed. The next relay change then fails the smoke test.

               - 'admin-web/**'
+              - 'voltage/images/test-relay-image.sh'
               - '.github/workflows/voltage-agent-images.yml'

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Review comment at @.github/workflows/voltage-agent-images.yml around lines 120 -
137:
Add voltage/images/test-relay-image.sh to the relay path filter so changes to
the relay smoke script activate the workflow and build job. Preserve the
existing agent and reaper filters and all other relay paths.

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Valid. Deferred to a follow-up PR so this one does not restart the relay build, which blocks the prod relay cutover (voltagecloud/cd#649). The main publish job runs the smoke test before it pushes, so this does not affect the image published from this PR.

@tee8z Understood. Deferring the filter change avoids restarting the relay build during the cutover. Your explanation limits the remaining concern to future smoke-script-only changes.

Would you like me to open a GitHub issue for the follow-up?

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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Validate the shape of depot.json and handle TypeError.

json.loads only guarantees syntactically valid JSON. The code does not check that the decoded value is an object whose organization is a string.

• If depot.json holds a JSON list or string, ['organization'] raises TypeError.
• If organization is a non-string value such as a number, re.fullmatch raises TypeError.

The except at Line 46 catches only ValueError, KeyError, and OSError. A wrong-shaped file therefore ends in a raw traceback. It does not end in the intended suppressed message and exit code 1.

Validate the type explicitly and reject it as an invalid enrollment.

--- "a/voltage/images/buzz-agent/cache.py"
+++ "b/voltage/images/buzz-agent/cache.py"
@@ -17,10 +17,12 @@
         return env
     if not configuration.is_file() or not token_file.is_file():
         raise ValueError('Depot enrollment is incomplete')
-    organization = json.loads(configuration.read_text())['organization']
+    record = json.loads(configuration.read_text())
+    organization = record.get('organization') if isinstance(record, dict) else None
     token = token_file.read_text().strip()
-    if not re.fullmatch(r'[a-zA-Z0-9_-]{1,64}', organization) or not token or any(c.isspace() for c in token):
+    if not isinstance(organization, str) or not re.fullmatch(r'[a-zA-Z0-9_-]{1,64}', organization) \
+            or not token or any(c.isspace() for c in token):
         raise ValueError('Invalid Depot enrollment')
     env.update(DEPOT_TOKEN=token,
                SCCACHE_WEBDAV_ENDPOINT='https://cache.depot.dev',
                SCCACHE_WEBDAV_USERNAME=organization, SCCACHE_WEBDAV_PASSWORD=token,

Based on learnings: check that a successfully decoded value has the expected structure and required field types before using it.

Also applies to: 46-46

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Review comment at @voltage/images/buzz-agent/cache.py around lines 20 - 22:
Validate the decoded configuration in the enrollment-loading flow before
accessing or matching organization: ensure the JSON result is a dictionary and
organization is a string, otherwise treat it as an invalid enrollment by raising
the existing ValueError. Update the surrounding exception handling to preserve
the intended suppressed message and exit code for malformed shapes, while
keeping token validation unchanged.

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Source: Learnings

Valid, but this code moved unchanged from voltagecloud/images at f944157: it is existing behavior of the staging agent image, not a change in this PR. Deferred to a follow-up PR for the agent image, so this PR stays a move plus the publishing workflow.

@tee8z Thanks for clarifying. This is a pre-existing issue, not a regression introduced by #44. Deferring it to the agent-image follow-up is reasonable for this move-and-publish PR. The finding remains valid but is not a merge blocker.

Would you like me to open a GitHub issue for the follow-up?

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🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win

Remove a queued waiter when the handler exits before the grant.

The handler appends waiter to self.waiting at Line 59. It removes the waiter only on the closed path at Line 66. Suppose an exception or cancellation occurs after the append and before granted = True. Examples are a ConnectionError from writer.write or writer.drain() at Lines 62-63, or task cancellation. Then waiter stays in the deque as a pending future.

A later _grant_next pops that waiter and sees not waiter.done(). It increments self.active and sets the result. No handler is left to release the slot, so the slot leaks until the gate restarts. If this happens BUZZ_HEAVY_SLOTS times, the gate stops admitting jobs.

Track the waiter and clean it up in finally.

     async def handle(self, reader, writer):
         granted = False
         closed = None
+        waiter = None
         try:
 ...
         finally:
             if closed is not None:
                 closed.cancel()
-            if granted:
+            if waiter is not None and not granted:
+                if waiter.done() and not waiter.cancelled():
+                    # Granted by _grant_next but never acknowledged: release it.
+                    granted = True
+                else:
+                    waiter.cancel()
+            if granted:
                 self.active -= 1
                 log('released', active=self.active, waiting=len(self.waiting))
                 self._grant_next()
             writer.close()

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Review comment at @voltage/images/buzz-agent/heavy.py around lines 76 - 83:
Update handle to track the queued waiter and clean it up in finally when the
handler exits before grant. Cancel or remove an ungranted waiter, and account
for a waiter already granted by _grant_next before the handler observed it so
active is released exactly once; preserve normal granted cleanup and writer
closure.

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Valid, but this code moved unchanged from voltagecloud/images at f944157: it is existing behavior of the staging agent image, not a change in this PR. Deferred to a follow-up PR for the agent image, so this PR stays a move plus the publishing workflow.

@tee8z Thanks for clarifying. Deferring the existing slot-leak issue to an agent-image follow-up keeps this PR within its move-and-publish scope. The finding remains valid but deferred.

Would you like me to open a GitHub issue to track the follow-up?

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🩺 Stability & Availability | 🟠 Major | ⚡ Quick win

A container restart fails during the developer-profile bootstrap.

write_file opens each credential file with O_CREAT | O_EXCL. bootstrap() writes github-token, op-token, via.toml, depot-token, depot.json, and profile.json into /home/agent/.config/buzz-agent on every run and work start. When an API key is present, it also writes .codex/config.toml.

The README requires a disk-backed /home/agent. A container restart in the same Pod keeps that volume, and entrypoint.sh accepts the restart because the Pod UID does not change. The second start therefore raises FileExistsError. The __main__ handler catches it as OSError and prints "Developer profile refused". The container then exits 1 on every restart, and the Sandbox enters a crash loop.

This also prevents the "restart with marker skips restore" path in README line 68 for developer-profile Sandboxes, because bootstrap() runs before restore_checkpoint(). account.py save() uses O_TRUNC, so the non-profile path is not affected. The tests miss this failure for two reasons. test-profile.py starts every mode in a fresh tmpfs. test-restore.py tests a restart only in plain mode, which does not use a profile.

install_subagent_guide has a related problem: it opens CLAUDE.md and AGENTS.md in append mode. After you fix the restart failure, each restart adds another copy of the guide.

Fix: replace credential files atomically. Write to a new temporary file in the same verified directory with O_EXCL | O_NOFOLLOW, then os.replace it over the target. Keep the owner and mode checks on the parent directories. Write the guide once, for example only if its content is not already present. Add a profile-mode restart case to test-restore.py.

--- "a/voltage/images/buzz-agent/profile.py"
+++ "b/voltage/images/buzz-agent/profile.py"
@@ -131,9 +131,16 @@
         require(stat.S_ISDIR(info.st_mode) and info.st_uid == os.getuid()
                 and not info.st_mode & 0o077, 'Unsafe credential directory')
         parent = parent.parent
-    descriptor = os.open(path, os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_NOFOLLOW, 0o600)
-    with os.fdopen(descriptor, 'w') as stream:
-        stream.write(value)
+    staged = path.with_name('.' + path.name + '.' + os.urandom(8).hex())
+    descriptor = os.open(staged, os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_NOFOLLOW, 0o600)
+    try:
+        with os.fdopen(descriptor, 'w') as stream:
+            stream.write(value)
+        # rename() replaces a symlink entry itself; it never follows the target.
+        os.replace(staged, path)
+    except BaseException:
+        staged.unlink(missing_ok=True)
+        raise
 
 
 def bootstrap():

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Review comment at @voltage/images/buzz-agent/profile.py at line 134:
Make profile bootstrap restart-safe by updating write_file to stage each
credential in a unique temporary file within the verified parent directory, then
atomically replace the target while preserving existing ownership, mode, and
symlink protections. Update install_subagent_guide to avoid appending duplicate
guide content across restarts. Extend the profile-mode coverage in
test-restore.py to verify restart and marker-based restore behavior.

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Valid, but this code moved unchanged from voltagecloud/images at f944157: it is existing behavior of the staging agent image, not a change in this PR. It is a priority for the follow-up PR for the agent image.

@tee8z Thanks for clarifying. This is an existing staging-agent defect, not a regression introduced by #44. Deferring the fix to the agent-image follow-up PR makes sense.

Would you like me to open a GitHub issue for the restart-safe credential writes, guide deduplication, and profile-mode restart test?

Learnt from: tee8z
Repo: voltagecloud/buzz PR: 44
File: voltage/images/buzz-agent/profile.py:134-134
Timestamp: 2026-10-21T20:13:43.917Z
Learning: The Buzz Agent runtime code in voltagecloud/buzz under voltage/images/buzz-agent/ was migrated unchanged from voltagecloud/images at commit f944157. The developer-profile bootstrap restart failure in profile.py is inherited staging-agent behavior, not a regression introduced by the migration.

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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win

Tie each result to one spawn, so a reused task ID cannot return an old result.

The result key depends only on the developer and the task: <developer>/workers/<task>/result.json. spawn --task <id> accepts any valid ID and does not remove an existing result.json. The claim name worker-<task> can be created again after the old claim is deleted, or after ttlSecondsAfterFinished expires.

If an orchestrator reuses an ID such as fix-tests, wait and result read the previous object. They return immediately with the old branch, head, and summary. The orchestrator can then merge stale work as if it were the new result.

The new worker also has a problem. Its git push to the existing worker/<task> branch is rejected as non-fast-forward, so it reports pushed: False.

Generate a per-spawn ID and pass it as BUZZ_WORKER_RUN. Have the worker write it into result.json, and have result() reject a result whose run ID does not match. Another option is to refuse spawn when a result already exists for the task.

Also update the exact env-set assertion on Line 170 of test-worker.py.

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Review comment at @voltage/images/buzz-agent/subagent.py around lines 96 - 106:
Generate a unique per-spawn run ID in the spawn flow and include it as the
BUZZ_WORKER_RUN environment variable in the claim created by the claim-building
logic. Propagate that ID into the worker’s result.json, and update result() to
reject results whose run ID does not match the current spawn, preventing stale
task results from being returned. Update the exact environment-set assertion in
test-worker.py to include BUZZ_WORKER_RUN.

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Valid, but this code moved unchanged from voltagecloud/images at f944157: it is existing behavior of the staging agent image, not a change in this PR. Deferred to a follow-up PR for the agent image, so this PR stays a move plus the publishing workflow.

@tee8z Understood. This is existing staging-image behavior, not a regression introduced by this PR. Deferring the fix keeps this PR focused on the image move and publishing workflow. The finding remains valid but deferred.

Would you like me to open a GitHub issue for the follow-up?

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🩺 Stability & Availability | 🟠 Major | ⚡ Quick win

Measure the runtime timeout from the worker's start, so cloning cannot use up the publish reserve.

buzz-subagent spawn sets BUZZ_WORKER_TIMEOUT to minutes * 60 - 120. Only the last 120 seconds of the claim lifetime are meant for commit, push, and publish. run_runtime starts its full timeout only after the steps before it have finished:

• the profile bootstrap,
• git clone, which can take up to 600 seconds,
• git switch.

If those steps take 90 seconds, the runtime ends about 30 seconds before shutdownTime. When the Sandbox stops at shutdownTime, the worker gets SIGTERM while it commits, pushes, or runs aws s3api put-object. run_runtime has already restored the default handlers, so the process exits at once. The branch push and result.json are then lost. buzz-subagent wait then polls until its own timeout.

Subtract the time already spent before starting the runtime. A stronger fix passes the absolute shutdownTime as an env var and computes the remaining time from it.

     prompt = PROMPT.format(focus=focus, repo=repo, path=path, branch=branch, base=base)
-    exit_code, output = run_runtime(runtime_command(runtime, prompt), path, timeout)
+    remaining = max(1, int(timeout - (time.monotonic() - started)))
+    exit_code, output = run_runtime(runtime_command(runtime, prompt), path, remaining)

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Review comment at @voltage/images/buzz-agent/worker.py around lines 155 - 168:
Update the worker flow around timeout initialization and run_runtime so the
timeout includes all pre-runtime work: preserve the worker start monotonic
timestamp, subtract elapsed time before invoking run_runtime, clamp the
remaining timeout to at least one second, and pass that value instead of the
full timeout. Ensure the existing clone, switch, and runtime execution flow
remains unchanged.

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Valid, but this code moved unchanged from voltagecloud/images at f944157: it is existing behavior of the staging agent image, not a change in this PR. It is a priority for the follow-up PR for the agent image.

@tee8z Thanks for clarifying. This is an existing timeout issue, not a regression introduced by this PR. Addressing it in the agent-image follow-up PR is reasonable.

Would you like me to open a GitHub issue to track it?

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🩺 Stability & Availability | 🟠 Major | ⚡ Quick win

Publish a failure result when the worker fails after validation.

These failures exit without writing result.json:

• git clone fails, for example because the base branch does not exist.
• git switch fails.
• The WIP git commit fails, for example because signing fails.
• run_runtime raises Refused because the runtime output did not close.

Each one raises CalledProcessError or Refused. The handlers in __main__ then exit 1 or 2 without calling publish.

buzz-subagent wait treats a missing result.json as a worker that is still running. It polls every 15 seconds until --timeout, which defaults to 3600 seconds. The orchestrator therefore cannot tell a failed clone from a long task. The spawn client also does not validate --repo or --focus, so bad inputs reach the worker and fail the same way.

Catch failures in main() after task_inputs() succeeds. Then publish a result with an error field and a non-zero exit_code, and exit. Clone and commit failures will then appear in buzz-subagent result at once.

def main():
    started = time.monotonic()
    task, focus, repo, base, runtime = task_inputs()
    ...
    try:
        return run_task(...)  # current body from clone through publish
    except (subprocess.CalledProcessError, Refused) as error:
        publish({'version': 1, 'task': task, 'runtime': runtime, 'repo': repo, 'base': base,
                 'branch': f'worker/{task}', 'pushed': False, 'commits': 0, 'exit_code': 1,
                 'error': str(error)[:500],
                 'duration_ms': int((time.monotonic() - started) * 1000)})
        raise

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Review comment at @voltage/images/buzz-agent/worker.py around lines 164 - 182:
Update main() after task_inputs() succeeds to catch
subprocess.CalledProcessError and Refused from the worker flow, including clone,
switch, WIP commit, and run_runtime. Publish a failure result immediately with
the task context, branch, zero commits, pushed false, nonzero exit_code,
truncated error text, and duration, then exit with failure while preserving the
existing successful publish path.

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Valid, but this code moved unchanged from voltagecloud/images at f944157: it is existing behavior of the staging agent image, not a change in this PR. It is a priority for the follow-up PR for the agent image.

@tee8z Thanks for clarifying. This is an existing defect in the staging agent image, not a regression introduced by this PR. Deferring the fix to the agent-image follow-up PR is reasonable.

Would you like me to open a GitHub issue to track the failure-result handling?

Learnt from: CR
Repo: voltagecloud/buzz PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-10-21T00:39:57.834Z
Learning: Source excerpt:
# AGENTS.md — AI Agent Contributor Guide

## Review-Proven Rules

1. **Every caught failure must leave a durable retry record or propagate.**
   Never catch-log-and-return-success (opt-out revocation permanently
   abandoned, PR #6269), never convert a terminal failure into an
   authoritative success/empty result (cold-history `error` → `success`
   with `[]`, PR #7013), and never delete the durable journal an operation
   depends on before its retry has actually succeeded (PR #6269). If a
   partial failure can orphan committed state (installations, endpoints),
   schedule its cleanup/renewal durably (PRs #6269, #6996, #7013).

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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Fail when ldd cannot inspect a relay binary.

If a binary is missing or ldd fails for another reason, grep can return no match. The if condition then treats the check as successful. Check that each binary exists and that ldd succeeds before searching its output for missing libraries. The CI workflow uses this script as its relay smoke test. (github.com)

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Review comment at @voltage/images/test-relay-image.sh at line 15:
Update the relay binary validation around ldd so each /usr/local/bin/$binary
exists and ldd completes successfully before checking its output for “not
found”; make either failure cause the smoke test to fail while preserving
detection of missing libraries.

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Valid: a missing buzz-relay or buzz-pair-relay would pass this check. (A missing buzz-admin already fails at the --help run.) Deferred to a follow-up PR so this one does not restart the relay build, which blocks the prod relay cutover (voltagecloud/cd#649).

@tee8z Understood. Missing buzz-admin already fails at the --help run. The remaining check can go in the follow-up PR to avoid restarting the relay build before the cutover.

Would you like me to open a GitHub issue for the deferred fix?

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