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PrBabysitter pass aborts row recording: ThreadNames.Prepared throws MissingMethodException against the loaded core build (assembly skew, sibling of #6102)

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
csharp, github
Domain
backend, devops

Research direction

Start with Hosting/Deployment/Source/ThreadNames and inspect ThreadNames.Prepared, then check which MeshWeaver.AI member the pod's loaded core build provides. Compare the core and Hosting/Plugins assemblies in the deployment with the build-consistency checks referenced in #6007 and #6067. Done means the babysitter can record all pass rows without MissingMethodException; the separate GitHub 403 token-access symptom may need separate tracking.

Written by the indexing model from the issue text.

Description

bug sev:M

What is failing

The PrBabysitter sweep's pass summary carries a System.MissingMethodException thrown from ThreadNames.Prepared(String group, String name, String description) while the sweep was recording its pass rows; a row could not be recorded and the pass completed only partially. The same log line also shows GitHub returning 403 for the open pull requests of most plugin repositories and for the head check runs of many PRs — a second, likely separate symptom (token scope), flagged here because it dominates the same line and left most of the sweep's PR-health picture unread.

Probable cause

The same compile-time-vs-runtime assembly skew as #6102 / #6067 / #6007 — high confidence on the defect class, unknown member. ThreadNames.Prepared is the exact top frame of #6102, where it threw because the helper sets MeshWeaver.AI.ThreadPreparation.set_Group and the loaded core build lacked that setter. The fingerprint masks the method name here (normalized to {value}), so which member is missing cannot be read from this incident alone — but the frame, the exception type and the row-recording seam all match. Context: the thread-groups change (b7a083d98) made the group argument required for ThreadNames.Prepared in Hosting while ThreadPreparation.Group arrived in core in a separate PR — the same two-independently-green-PRs semantic-conflict shape reported in feedback fb-714593457d90a2b32093800d1cdc6d65. The failing pod is from a newer deployment generation than #6102's, so either the #6007/#6067 build-consistency fix does not cover the PrBabysitter path, or a fresh core/Hosting skew was introduced with the redeploy.

Impact

One occurrence on one pod so far, internal automation. The babysitter pass still ran and produced a (partial) report, so the cost is a lost row and an incomplete PR-health picture — no user-facing data at risk. The GitHub 403s mean the sweep is currently flying mostly blind regardless of this exception.

Where to look

  • ThreadNames.Prepared(String group, String name, String description) in Hosting/Deployment/Source/ThreadNames — the failing frame.
  • The pod's core MeshWeaver.AI build: confirm which member ThreadNames.Prepared binds to (likely ThreadPreparation.set_Group) and that the image's core and Hosting/Plugins assemblies come from one build — the same consistency check prompted by #6007 and #6067.
  • The GitHub 403s on PRs and check runs across the plugin repos — the sweep's token appears to have lost read access; worth a separate ticket if not already tracked.

Related: #6102 (same top frame, sibling symptom on the Steward intake path), #6067, #6007 (the original mixed-build condition). Likely the same underlying deployment defect; a human may close this as a recurrence once the build-consistency fix lands.

Evidence
Fingerprint f9cc5fe0d827440e
Category PrBabysitter
Severity Error
Exception System.MissingMethodException
Top frame ThreadNames.Prepared(String group, String name, String description)
Namespace memex
Pods memex-portal-deployment-67c67b456d-255rq
Occurrences 1
First seen 2026-10-05 05:32:38Z
Last seen 2026-10-05 05:32:38Z
Routing not determined — no configured route matches the category PrBabysitter. This repository is the configured fallback, not a finding about who owns the fault; the category names the LOGGER, which may not be the subject.
Recent log lines 
2026-10-05 05:32:38Z memex-portal-deployment-67c67b456d-255rq fail: PrBabysitter[0]
      [PrBabysitter] the pass (Partial: full pass: 1 repository read, 19 open pull request(s), 1 draft(s) skipped, 6 red, 5 heal proposal(s); 🚨 5 red from their BASE, not their diff (5× Systemorph/MeshWeaver main :: 'lane / automatic review answered' concluded failure: process completed with exit code 1.); NOT read: Systemorph/MeshWeaver.Plugins (GitHub answered 403 to the open pull requests (page 1)); Systemorph/Memex (GitHub answered 403 to the open pull requests (page 1)); Systemorph/MeshWeaver.Crm (GitHub answered 403 to the open pull requests (page 1)); Systemorph/MeshWeaver.Education (GitHub answered 403 to the open pull requests (page 1)); Systemorph/MeshWeaver.Reinsurance (GitHub answered 403 to the open pull requests (page 1)); Systemorph/MeshWeaver.SocialMedia (GitHub answered 403 to the open pull requests (page 1)); Systemorph/MeshWeaver.Manufacturing (GitHub answered 403 to the open pull requests (page 1)); Systemorph/MeshWeaver.FundReporting (GitHub answered 403 to the open pull requests (page 1)); NOT fully read (previous row kept): Systemorph/MeshWeaver#6110 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6109 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6108 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6106 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6103 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6101 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6100 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6099 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6098 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6097 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6093 (GitHub answered 403 to the head's check runs); Systemorph/MeshWeaver#6092 (GitHub answered 403 to the head's check runs); Systemorph/Mes…[truncated]

Re-addressed by the current identity function: this incident inherited 0e53546c0ce851b7 (Systemorph/MeshWeaver.Plugins#1796). Those nodes are superseded and will not fold, file or comment again.

Opened automatically from Admin/_LogIncident/f9cc5fe0d827440e. Recurrences are folded into this issue rather than opening new ones.
It also stands for the whole log site bd10351ea29e28ae: other fingerprints of this site fold in here as comments rather than opening tickets of their own.

Dominant language
C#
Stars
12
Forks
5
Avg merge
3h 53m
Merged PRs (30d)
968

Getting set up

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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