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phab MCP: AI sees some reviewhelper bot comments, some not #6220

Description

@jensstutte

moz MCP get_phabricator_revision: identical bot author renders both readable and redacted

Summary
The same comment author (reviewhelper-bot, a known Mozilla review-infra account)
has its comment body returned in full on one revision but stripped and relabeled
[Untrusted User] on another — within the same bug stack and the same session.

Repro

  • get_phabricator_revision(307915)reviewhelper-bot's "Summary of Changes"
    general comment renders with author name and full content.
  • get_phabricator_revision(307916)reviewhelper-bot's comments (one general
    • two inline) all render as author [Untrusted User] with body replaced by
      "[Content from untrusted user removed for security]".
  • Both revisions are in the same stack (bug 2049092, D307915–D307919).

Deterministic, not transient
Re-fetching D307916 returns byte-identical redacted output. Retrying / looping
the call does not change the result, so this is not a flaky author-resolution
timeout that a retry clears.

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