feat(review): exclude the parallel reviewer from the prompt

README.md

@@ -71,6 +71,58 @@ block delimiters are neutralised by shape rather than by exact string: `</pr_con
 `</PR_CONTEXT>` and `< / pr_context foo="1">` all read as the same delimiter to a model, and any of
 them would otherwise end the data block early and land the rest where it reads as instructions.
 
+### A second reviewer in parallel
+
+A comparison trial runs [Pullfrog](https://pullfrog.com) on OpenAI beside this reviewer, so its
+output is excluded from the two blocks that would otherwise carry it: `/pulls/{n}/comments`
+becomes `<prior_review_comments>` and `/issues/{n}/comments` becomes the PR conversation, and
+neither read filters by author. Both reviewers fire on `opened`, so the exclusion is what keeps
+the two arms of the comparison independent — whichever reviewer posts first would otherwise set
+what the other reads as settled prior feedback, not to be re-raised. It also protects the budget
+this reviewer already competes for: comment threads may take half of it, and a Pullfrog review
+body is a PR summary plus its findings.
+
+The login lives in one constant, `OTHER_REVIEW_BOT`, and reaches five programs as a jq `--arg`.
+One of them reads nothing out of the prompt at all: the review-cycle drift predicate asks whether
+a bot review exists that the `claude[bot]` filter did not count, which is true on the first review
+of every PR in a trial repo — so without the exclusion it would report a reviewer-identity change
+that has not happened, on every pull request, which is how the warning goes unread on the one
+where it is real. The predicate still has to fire when a drifted login sits *beside* the excluded
+one, and after the trial that is the only shape a real drift takes, so it is the case the fixtures
+pin.
+
+The CI block is the third channel and the one with teeth, so `CHECKS_JQ` and `FAILING_JOBS_JQ`
+drop the same reviewer's checks through one shared owner test, `CHECK_OWNER_JQ`, composed into both
+the way the workflow composes `CMD_JQ` into `TOOL_USAGE_JQ` — two copies of that rule were free to
+disagree about what "theirs" means, and did. It matches the app slug against both the entry's own
+name and its `workflowName`, downcased, since a GitHub App's login is its slug plus `[bot]` (so
+`$skip` stays the single constant) while an Actions check run carries the *job* name in `.name` —
+matching that alone would make the exclusion depend on a job key in another repository. Pullfrog's verdict is a check,
+`pullfrog-approval`, failing when it requested changes, and this prompt tells the reviewer that a
+failing check is a blocking issue to name and cite. Unfiltered, the rollup does not merely leak
+the other arm's conclusion; it converts it into a request-changes this reviewer cannot
+substantiate from the diff. Its run-status check is worse per byte: the check links to Pullfrog's
+own Actions job, and `FAILING_JOBS_JQ` would fetch that job's log into a `### Failing job` excerpt
+— the other reviewer's transcript, verbatim, at up to an eighth of the context. That the check
+gates no merge is true of merge and silent about the prompt.
+
+Where the exclusion empties a block it says so and how much it withheld, because
+"No prior review comments." on a PR that has some is the same false claim as an empty CI block
+reading as a green one. Where other entries remain it stays silent: neither block claims to be
+every comment or every check on the PR. One rendering changes with it. A human reply to an
+excluded comment is kept — real feedback, and dropping it would hide more than the exclusion
+protects — but its parent is gone, and an id pointing at nothing in the block turns "fixed in the
+next push" into a settled finding whose subject the reviewer never sees. So an orphaned reply is
+relabelled rather than renumbered or dropped.
+
+Pullfrog cannot submit an approving review and `pullfrog-approval` is not required in the org
+ruleset, so this reviewer remains the only automated approval in the org for the duration of the
+trial. The constant, the four exclusions, the drift predicate's exception and this section come out
+when the trial ends — the drift predicate by name, because it is the one place an incomplete
+removal is silent. Delete `OTHER_REVIEW_BOT` and leave `$skip` in `DRIFT_JQ` and its `jq` call
+fails to compile, which the `elif` guarding it reads as "no drift": the backstop against a
+reviewer-login change would be gone with no warning in either direction.
+
 ### Tool usage artifact
 
 Each run attaches a `claude-tool-usage-pr-<number>` artifact (14-day retention): tool call counts,

scripts/gather-review-context.sh

@@ -298,9 +298,31 @@ fetch_raw() {
 # Coupled to the reviewer's login: if that ever changes the count silently drops
 # to 0 and every round looks like the first, hence the warning below.
 CYCLE_JQ='[.[][] | select(.user.login == "claude[bot]") | .commit_id] | unique | length'
+# The login of the second automated reviewer running beside this one, and the one value
+# three programs below have to agree on. A comparison trial has Pullfrog reviewing the same
+# pull requests, and both reviewers fire on `opened`, so its output reaches this reviewer
+# through two reads that filter by nothing: `/pulls/{n}/comments` becomes
+# <prior_review_comments> and `/issues/{n}/comments` becomes the PR conversation. Left in,
+# it costs the trial its independence -- whichever reviewer posts first sets what the other
+# reads as settled prior feedback -- and it costs the diff blocks the bytes, since comment
+# threads may take half the escaped-byte budget and a cut context measured 0.92 findings a
+# run against 1.91 uncut. So the exclusion is not tidiness; it is what keeps the two arms
+# of the comparison, and the reviewer's own budget, intact.
+#
+# Handed to jq with --arg at each site rather than written into each program, because a
+# second copy of a constant is a copy free to drift from the first. tests/lib.sh reads this
+# assignment for the same reason it extracts the jq programs.
+#
+# It comes out when the trial ends. Nothing else in the org posts reviews.
+OTHER_REVIEW_BOT='pullfrog[bot]'
 # Only consulted when CYCLE is 0; see the warning below. Kept in its own variable
 # so tests/review-cycle-test.sh can assert it against the fixtures.
-DRIFT_JQ='any(.[][]; .user.type == "Bot")'
+#
+# $skip is excluded from the predicate, not merely from the count: the trial makes a bot
+# review on a genuine cycle 1 the ordinary case, so without it every first review in a
+# trial repo would report a reviewer-identity drift that has not happened -- and an alarm
+# that fires on every PR is an alarm nobody reads on the PR where it is real.
+DRIFT_JQ='any(.[][]; .user.type == "Bot" and .user.login != $skip)'
 # Never fail the review over the cycle number; degrade to 1, but say so. gh
 # writes its error body to stdout, so an unguarded pipe into jq aborts the step
 # under `bash -e` and skips the failure-notification step below.
@@ -326,9 +348,10 @@ if [ -z "$CYCLE" ]; then
   echo "::warning::Could not parse prior reviews; treating this as review cycle 1."
   CYCLE=0
 elif [ "$CYCLE" -eq 0 ] && printf '%s' "$REVIEWS" \
-  | jq -e -s "$DRIFT_JQ" >/dev/null 2>&1; then
-  # claude[bot] is the only bot that submits reviews across the org (598 of 598
-  # sampled), so bot reviews that the login filter did not count mean the
+  | jq --arg skip "$OTHER_REVIEW_BOT" -e -s "$DRIFT_JQ" >/dev/null 2>&1; then
+  # claude[bot] was the only bot submitting reviews across the org when this was
+  # written (598 of 598 sampled), and $OTHER_REVIEW_BOT is the stated exception,
+  # so any *other* bot review that the login filter did not count means the
   # reviewer's identity moved and the counter has silently pinned at 1.
   echo "::warning::Bot reviews exist but none matched the reviewer login; the review cycle counter is stale."
 fi
@@ -352,22 +375,22 @@ fi
 # "No prior review comments." is only true when the fetch worked and returned
 # none. Saying it after a failed fetch is the same false claim as an empty CI block
 # reading as a green one, and it is the claim the cycle ladder acts on.
+#
+# $skip's comments are dropped here -- see OTHER_REVIEW_BOT above for why. The drop is
+# announced only when it empties the block, and that asymmetry is the point: with other
+# comments still present the block claims nothing about being every comment on the PR, but
+# "No prior review comments." on a PR that has some is the same false claim as an empty CI
+# block reading as a green one. So the empty case names what was withheld and how much.
+#
+# Single-line and single-quoted so tests/lib.sh can extract it; it was inline, and inline
+# meant the one program in this script that shapes the prompt's other output could not be
+# asserted against a fixture at all.
+THREADS_JQ='(add // []) as $all | ($all | map(select(.user.login != $skip))) as $kept | ($kept | map(.id)) as $ids | (($all | length) - ($kept | length)) as $dropped | if ($kept | length) == 0 then (if $dropped > 0 then "No prior review comments. (\($dropped) comment(s) from \($skip) are excluded from this block.)" else "No prior review comments." end) else ($kept | sort_by(.created_at) | .[] | "---", "Author: \(.user.login)", "File: \(.path)", (if .line then "Line: \(.line)" else empty end), (if .in_reply_to_id then (if (.in_reply_to_id | IN($ids[])) then "Reply to #\(.in_reply_to_id)" else "Reply to a comment excluded from this block" end) else "Thread #\(.id)" end), "", ((.body // "")[0:3000])) end'
 if [ "$COMMENTS_OK" -eq 0 ]; then
   THREADS='Unavailable: the prior inline review comments could not be read. This block is empty because the fetch failed, not because there were none.'
 else
-THREADS=$(printf '%s' "$COMMENTS" | jq -s -r '
-  (add // []) | sort_by(.created_at) |
-  if length == 0 then "No prior review comments."
-  else .[] |
-    "---",
-    "Author: \(.user.login)",
-    "File: \(.path)",
-    (if .line then "Line: \(.line)" else empty end),
-    (if .in_reply_to_id then "Reply to #\(.in_reply_to_id)" else "Thread #\(.id)" end),
-    "",
-    ((.body // "")[0:3000])
-  end
-') || THREADS='Unavailable: the prior inline review comments could not be parsed.'
+  THREADS=$(printf '%s' "$COMMENTS" | jq --arg skip "$OTHER_REVIEW_BOT" -s -r "$THREADS_JQ") \
+    || THREADS='Unavailable: the prior inline review comments could not be parsed.'
 fi
 
 # The prompt wraps both blocks below in <prior_review_comments> and <pr_context>
@@ -526,14 +549,49 @@ cap_file_escaped "$FILES_FILE" $((CTX_MAX_BYTES / 8)) \
 # The reviewer cannot run tests -- no dependencies are installed and the allowlist
 # would refuse anyway -- but CI already ran them. Whether they passed is the one
 # fact it was asserting without evidence.
-CHECKS_JQ='(.statusCheckRollup // []) | if length == 0 then "No checks reported." else map(if .__typename == "CheckRun" then "\(.conclusion // .status // "UNKNOWN") \(.workflowName // "") / \(.name // "(unnamed check)")" else "\(.state // "UNKNOWN") \(.context // "status")" end) | sort | join("\n") end'
+#
+# This block is the third channel $skip reaches, and the one where it does the most damage.
+# Pullfrog posts its verdict as a check -- `pullfrog-approval`, failing when it requested
+# changes -- and the prompt tells this reviewer that a failing check is a blocking issue to
+# name and cite. So an unfiltered rollup does not merely leak the other arm's conclusion; it
+# converts it into a request-changes this reviewer cannot substantiate from the diff.
+# `pullfrog` (the run-status check) rides along for the same reason, and its detailsUrl would
+# otherwise feed FAILING_JOBS_JQ below the *other reviewer's own job log* as a failing-job
+# excerpt, at up to an eighth of the context.
+#
+# Matched by name against the app slug rather than by a second constant: a GitHub App's bot
+# login is its slug plus "[bot]", and its checks are the slug and slug-prefixed names, so
+# $skip still carries the one value all five programs agree on. Both rollup shapes are
+# matched -- a CheckRun by .name, a StatusContext by .context -- because which of the two an
+# app posts is the app's choice, not ours.
+#
+# Silent while other checks remain, and stated when the exclusion empties the block: a list
+# claims nothing about being every check, but "No checks reported." on a PR that has some is
+# a false claim, and this is the block whose emptiness the README warns gets read as green.
+# One definition of "belongs to the other reviewer", composed into both programs below rather
+# than written into each: they are two programs, and a second copy of the rule is a copy free to
+# disagree with the first about what it matches -- which it already did, the failing-job scan
+# testing only .name while the list tested .context as well. Composed the way the workflow
+# composes CMD_JQ into TOOL_USAGE_JQ.
+#
+# It reads both names on the entry, not one. For a check the app posts itself, .name is the check
+# ("pullfrog", "pullfrog-approval") and there is no workflow behind it; for one that reached the
+# rollup from an Actions run, .name is the *job* name and .workflowName is the workflow's `name:`.
+# So a name-only test makes this exclusion depend on a job key in another repository staying
+# `pullfrog`: `name: Pullfrog` over a job called `review` arrives as
+# {name: "review", workflowName: "Pullfrog"} and slips through both programs whole. Dropping a
+# check belonging to a workflow named for the other reviewer is the intent in either shape.
+# Compared downcased for the same reason -- the slug is lowercase by construction, and a job name
+# is whatever someone typed.
+CHECK_OWNER_JQ='def slug: $skip | sub("\\[bot\\]$"; "") | ascii_downcase; def theirs: [(if .__typename == "CheckRun" then (.name // "") else (.context // "") end), (.workflowName // "")] | any(. != "" and (ascii_downcase | . == slug or startswith(slug + "-")));'
+CHECKS_JQ='def render: if .__typename == "CheckRun" then "\(.conclusion // .status // "UNKNOWN") \(.workflowName // "") / \(.name // "(unnamed check)")" else "\(.state // "UNKNOWN") \(.context // "status")" end; (.statusCheckRollup // []) as $all | ($all | map(select(theirs | not))) as $kept | (($all | length) - ($kept | length)) as $dropped | if ($kept | length) == 0 then (if $dropped > 0 then "No checks reported. (\($dropped) check(s) from \(slug) are excluded from this block; they carry a verdict from another reviewer, not a CI result.)" else "No checks reported." end) else ($kept | map(render) | sort | join("\n")) end'
 # Actions check runs carry the job id in detailsUrl; scan rather than capture so a
 # non-Actions check with no job id drops out instead of erroring.
-FAILING_JOBS_JQ='[(.statusCheckRollup // [])[] | select(.__typename == "CheckRun") | select((.conclusion // "") | test("FAILURE|TIMED_OUT|ACTION_REQUIRED")) | (.detailsUrl // "") | [scan("/job/([0-9]+)")] | flatten | .[0] // empty] | unique | .[0:3] | join(" ")'
+FAILING_JOBS_JQ='[(.statusCheckRollup // [])[] | select(.__typename == "CheckRun") | select(theirs | not) | select((.conclusion // "") | test("FAILURE|TIMED_OUT|ACTION_REQUIRED")) | (.detailsUrl // "") | [scan("/job/([0-9]+)")] | flatten | .[0] // empty] | unique | .[0:3] | join(" ")'
 if ROLLUP=$(gh pr view "$PR_NUMBER" --repo "$REPO" --json statusCheckRollup); then
-  CHECKS=$(printf '%s' "$ROLLUP" | jq -r "$CHECKS_JQ" 2>/dev/null) \
+  CHECKS=$(printf '%s' "$ROLLUP" | jq --arg skip "$OTHER_REVIEW_BOT" -r "$CHECK_OWNER_JQ $CHECKS_JQ" 2>/dev/null) \
     || CHECKS="Could not parse checks."
-  JOB_IDS=$(printf '%s' "$ROLLUP" | jq -r "$FAILING_JOBS_JQ" 2>/dev/null) || JOB_IDS=''
+  JOB_IDS=$(printf '%s' "$ROLLUP" | jq --arg skip "$OTHER_REVIEW_BOT" -r "$CHECK_OWNER_JQ $FAILING_JOBS_JQ" 2>/dev/null) || JOB_IDS=''
 else
   echo "::warning::Could not read check status."
   CHECKS="Could not read check status."
@@ -706,9 +764,13 @@ if [ "$FULL_DIFF_MAX" -gt "$DIFF_MAX" ]; then FULL_DIFF_MAX=$DIFF_MAX; fi
 # prompt on www.hotdata.dev#332. Stripped before the cap for the reason strip_block_tags
 # always runs first -- the substitution grows the text, so a cap on the unstripped file
 # bounds a smaller string than the one emitted.
-ISSUE_COMMENTS_JQ='[.[][]] | if length == 0 then "No PR conversation comments." else sort_by(.created_at) | map("--- \(.user.login) at \(.created_at)\n\((.body // "")[0:3000])") | join("\n") end'
+#
+# $skip is excluded here as well, and for the same reason: the review body Pullfrog posts
+# is a PR summary plus its findings, and this endpoint is where it lands. The empty case
+# names the withholding on the same principle as the threads block above.
+ISSUE_COMMENTS_JQ='[.[][]] as $all | ($all | map(select(.user.login != $skip))) as $kept | (($all | length) - ($kept | length)) as $dropped | if ($kept | length) == 0 then (if $dropped > 0 then "No PR conversation comments. (\($dropped) comment(s) from \($skip) are excluded from this block.)" else "No PR conversation comments." end) else ($kept | sort_by(.created_at) | map("--- \(.user.login) at \(.created_at)\n\((.body // "")[0:3000])") | join("\n")) end'
 if CONVO_JSON=$(gh api "repos/${REPO}/issues/${PR_NUMBER}/comments" --paginate); then
-  CONVO=$(printf '%s' "$CONVO_JSON" | jq -s -r "$ISSUE_COMMENTS_JQ" 2>/dev/null) \
+  CONVO=$(printf '%s' "$CONVO_JSON" | jq --arg skip "$OTHER_REVIEW_BOT" -s -r "$ISSUE_COMMENTS_JQ" 2>/dev/null) \
     || CONVO="Could not parse PR conversation comments."
 else
   echo "::warning::Could not read PR conversation comments."

tests/fixtures/pull-comments-mixed-authors.json

@@ -0,0 +1,44 @@
+[
+  {
+    "id": 2101,
+    "user": { "login": "claude[bot]" },
+    "path": "scripts/gather-review-context.sh",
+    "line": 412,
+    "created_at": "2026-08-27T09:00:00Z",
+    "body": "The cap is measured on the unstripped file, so the emitted block can exceed it."
+  },
+  {
+    "id": 2102,
+    "user": { "login": "zfarrell" },
+    "path": "scripts/gather-review-context.sh",
+    "line": 412,
+    "in_reply_to_id": 2101,
+    "created_at": "2026-08-27T09:31:00Z",
+    "body": "Fixed in the next push -- strip_block_tags runs first now."
+  },
+  {
+    "id": 2103,
+    "user": { "login": "pullfrog[bot]" },
+    "path": "scripts/gather-review-context.sh",
+    "line": 88,
+    "created_at": "2026-08-27T09:04:00Z",
+    "body": "## Summary\n\nThis PR reworks the context budget. One finding: the byte cap and the line cap disagree."
+  },
+  {
+    "id": 2105,
+    "user": { "login": "zfarrell" },
+    "path": "scripts/gather-review-context.sh",
+    "line": 88,
+    "in_reply_to_id": 2103,
+    "created_at": "2026-08-27T09:40:00Z",
+    "body": "Good catch -- fixed in the next push."
+  },
+  {
+    "id": 2104,
+    "user": { "login": "claude[bot]" },
+    "path": "tests/lib.sh",
+    "line": 22,
+    "created_at": "2026-08-27T09:05:00Z",
+    "body": null
+  }
+]

tests/fixtures/reviews-drift-with-other-bot.json

@@ -0,0 +1,32 @@
+[
+  {
+    "id": 1,
+    "commit_id": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+    "state": "COMMENTED",
+    "submitted_at": "2026-08-28T00:00:00Z",
+    "user": {
+      "login": "pullfrog[bot]",
+      "type": "Bot"
+    }
+  },
+  {
+    "id": 2,
+    "commit_id": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+    "state": "CHANGES_REQUESTED",
+    "submitted_at": "2026-08-28T00:01:00Z",
+    "user": {
+      "login": "claude-review[bot]",
+      "type": "Bot"
+    }
+  },
+  {
+    "id": 3,
+    "commit_id": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+    "state": "APPROVED",
+    "submitted_at": "2026-08-28T01:00:00Z",
+    "user": {
+      "login": "claude-review[bot]",
+      "type": "Bot"
+    }
+  }
+]

tests/fixtures/reviews-other-review-bot.json

@@ -0,0 +1,22 @@
+[
+  {
+    "id": 1,
+    "commit_id": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+    "state": "COMMENTED",
+    "submitted_at": "2026-08-28T00:00:00Z",
+    "user": {
+      "login": "pullfrog[bot]",
+      "type": "Bot"
+    }
+  },
+  {
+    "id": 2,
+    "commit_id": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+    "state": "CHANGES_REQUESTED",
+    "submitted_at": "2026-08-28T00:00:05Z",
+    "user": {
+      "login": "pullfrog[bot]",
+      "type": "Bot"
+    }
+  }
+]