diff --git a/.claude/settings.json b/.claude/settings.json
index 1b17432e8..78ba9b966 100644
--- a/.claude/settings.json
+++ b/.claude/settings.json
@@ -1,6 +1,8 @@
 {
   "$schema": "https://json.schemastore.org/claude-code-settings.json",
-  "enabledMcpjsonServers": ["serena"],
+  "enabledMcpjsonServers": [
+    "serena"
+  ],
   "hooks": {
     "SessionStart": [
       {
@@ -63,6 +65,17 @@
           }
         ]
       }
+    ],
+    "PostToolUse": [
+      {
+        "matcher": ".*save_issue|.*save_comment",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "$CLAUDE_PROJECT_DIR/mise-tasks/board-write-record"
+          }
+        ]
+      }
     ]
   },
   "permissions": {
diff --git a/mise-tasks/board-write-record b/mise-tasks/board-write-record
new file mode 100755
index 000000000..9d5a8b4ec
--- /dev/null
+++ b/mise-tasks/board-write-record
@@ -0,0 +1,147 @@
+#!/usr/bin/env bash
+#MISE description="PostToolUse hook body: record what this branch put on the board, with the tracker's own verdict on whether a new row was refined"
+#
+# CLOUD-514, phase 1. Every gate here prices FAILING to record something —
+# `finding-sink-check` fails a turn that cites evidence and writes nothing,
+# `deferral-check` fails a PR that defers without naming an issue. Nothing prices
+# the opposite. Filing satisfies all of them in seconds while finishing costs a
+# diff, a suite and a landing, so for an agent under pressure the punt is not a
+# temptation, it is arithmetic.
+#
+# THIS FILE GATES NOTHING. It is the sensor half, and shipping a sensor alone is
+# normally the "log without a gate" non-negotiable 2 refuses. The exception is
+# argued and measured: the gate's firing rate cannot be estimated retrospectively
+# because WHICH BRANCH PUT WHICH ROW ON THE BOARD has never been recorded
+# anywhere. The one available proxy — rows created between a PR opening and its
+# merge — was measured over 40 merged PRs and fires on 183 of 184, because a
+# window over a fleet captures every session's filings. So this record is what
+# makes the gate specifiable at all, and its enabling trigger is a number this
+# produces rather than a date.
+#
+# WHY THE LINT HAPPENS HERE, WHICH IS THE WHOLE DESIGN. The first draft had the
+# agent run `ready-lint` and mint a receipt. That is worthless: `ready-lint` reads
+# a payload the caller assembles, and it was run three times during this issue's
+# own refinement against text in a local file — once under the id `CLOUD-NEW`,
+# for a row that did not exist — green every time. A toll payable in text nobody
+# filed is not a toll. A `PostToolUse` body does not have that problem: it fires
+# on the tool RESULT, which is the tracker's response to the create.
+#
+# THE RESULT ENVELOPE IS MEASURED, NOT ASSUMED. No hook in this tree had ever
+# read a tool result, and the documented example is a `Write` whose response is a
+# flat object. An MCP tool's is not: it is the content-block list
+# `[{"type":"text","text":"<the row as JSON>"}]`, so `.tool_response.id` does not
+# exist and a body written against the documented shape would silently record
+# nothing.
+#
+# RELATIONS COME FROM THE INPUT, AND THAT IS NOT A COMPROMISE. `ready-lint`'s §8
+# rule cross-checks prose claiming `blockedBy CLOUD-N` against the payload's
+# relations, and the create response carries no relations at all — so linting the
+# response alone reports `blocker-cited-without-relation` on exactly the rows that
+# were refined most carefully. The create call's own `blockedBy` argument is the
+# entire relation set on a create (there is nothing prior to append to), so it is
+# what the tracker acted on. The BODY being judged is still the tracker's; naming
+# a blocker is what creates the relation, so this cannot claim a dependency the
+# board does not have.
+#
+# POINTER-ONLY IS LOAD-BEARING HERE (non-negotiable 4), not decorative: the text
+# this reads is the entire issue body. Four fields reach the file — kind, id,
+# updatedAt, verdict — and nothing is ever printed.
+#
+# FAILS OPEN AND SILENT on everything it cannot establish. A recorder that
+# blocked or noised a board write would cause the failure `finding-sink-check`
+# exists to catch, which is the opposite of the point.
+#
+# The mutation collapses create and update, so every edit to an existing row is
+# recorded as a filing — which inflates the very count the gate will be specified
+# against, in the direction that makes filing look normal.
+#MUTANT update-recorded-too|s/^\t\[ -n "\$existing" \] && exit 0$/\t[ -n "$existing" ] \&\& :/|updating an existing row is never recorded
+# The mutation drops the relations synthesis, so a row whose §8 claims a blocker
+# lints as blocker-cited-without-relation and records `unready` — the false
+# refusal that would fire on the best-refined rows.
+#MUTANT relations-dropped|s/relations: {blockedBy: \$blockers}/relations: {}/|claims a blocker still records a green verdict
+set -uo pipefail
+
+[ -n "${BATTEN_BOARD_WRITE_BYPASS:-}" ] && exit 0
+
+raw=$(cat) || exit 0
+
+tool=$(printf '%s' "$raw" | jq -r '.tool_name // empty' 2>/dev/null) || exit 0
+[ -n "$tool" ] || exit 0
+
+# Suffix, never prefix. CLOUD-178 measured the same connector exposed as
+# `mcp__Linear__save_issue`, `mcp__<uuid>__save_issue` and
+# `mcp__claude_ai_Linear__save_issue` depending on the registration episode, so a
+# rule naming one matches none of the others and the miss is silent. The settings
+# matcher is anchored the same way; this is belt to its braces.
+case "$tool" in
+*save_issue) kind=issue ;;
+*save_comment) kind=comment ;;
+*) exit 0 ;;
+esac
+
+# An `id` in the INPUT means this updates a row that already exists, which is not
+# a board write this branch is answerable for. `finding-sink-check` already tells
+# the two apart this way.
+if [ "$kind" = issue ]; then
+	existing=$(printf '%s' "$raw" | jq -r '.tool_input.id // empty' 2>/dev/null) || exit 0
+	[ -n "$existing" ] && exit 0
+fi
+
+# The content-block envelope, per the measurement in the header. `fromjson?`
+# rather than `fromjson` so a text block that is not JSON is skipped instead of
+# aborting the whole read.
+row=$(printf '%s' "$raw" | jq -c '
+	[ .tool_response[]? | select(.type == "text") | .text | fromjson? ] | first // empty
+' 2>/dev/null) || exit 0
+[ -n "$row" ] || exit 0
+
+id=$(jq -r '.id // empty' <<<"$row" 2>/dev/null) || exit 0
+[ -n "$id" ] || exit 0
+updated=$(jq -r '.updatedAt // "-"' <<<"$row" 2>/dev/null) || updated=-
+
+git_dir=$(git rev-parse --git-dir 2>/dev/null) || exit 0
+[ -n "$git_dir" ] || exit 0
+branch=$(git symbolic-ref --quiet --short HEAD 2>/dev/null) || exit 0
+[ -n "$branch" ] || exit 0
+
+# A comment is sink 2 — recorded so the create-versus-comment ratio is
+# observable, never judged. Only a new row carries a refinement obligation.
+verdict=-
+if [ "$kind" = issue ]; then
+	blockers=$(printf '%s' "$raw" | jq -c '[.tool_input.blockedBy[]? | {id: .}]' 2>/dev/null) || blockers='[]'
+	payload=$(jq -c --argjson blockers "$blockers" '{
+	  id: .id,
+	  description: (.description // ""),
+	  relations: {blockedBy: $blockers}
+	}' <<<"$row" 2>/dev/null) || payload=""
+	# BY PATH, AND THE STATUS IS READ AS THREE ANSWERS RATHER THAN TWO.
+	#
+	# `mise run ready-lint` is the obvious call and is wrong here: a hook inherits
+	# the cwd of the tool call, which is not required to be inside this project,
+	# and `mise run` outside a project errors out. That failure is silent and it
+	# lands on the WRONG side — mapping any non-zero to `unready` would record a
+	# refusal for every row filed from a directory mise could not resolve, which
+	# is a verdict about the environment wearing the mask of a verdict about the
+	# row. Sibling tasks are addressed relative to this file for that reason.
+	#
+	# `ready-lint`'s contract is 0 pass / 1 the block is wrong / 2 the input was
+	# unreadable, so only 1 is a judgement. Anything else — 2, or a 127 from a
+	# missing interpreter — leaves the verdict `-`, which the gate reads as "not
+	# answered" rather than as a refusal.
+	if [ -n "$payload" ]; then
+		printf '%s' "$payload" | "$(dirname -- "${BASH_SOURCE[0]}")/ready-lint" >/dev/null 2>&1
+		case $? in
+		0) verdict=ready ;;
+		1) verdict=unready ;;
+		*) verdict=- ;;
+		esac
+	fi
+fi
+
+mkdir -p "$git_dir/batten-receipts" 2>/dev/null || exit 0
+# Slashes are the one character a filename cannot carry; the substitution matches
+# every other branch-keyed receipt here.
+record="$git_dir/batten-receipts/board-writes.${branch//\//-}"
+printf '%s %s %s %s\n' "$kind" "$id" "$updated" "$verdict" >>"$record" 2>/dev/null || exit 0
+
+exit 0
diff --git a/mise.toml b/mise.toml
index 6cb55aaba..4c79e8ae8 100644
--- a/mise.toml
+++ b/mise.toml
@@ -203,7 +203,7 @@ CI_ANSWERED_CONCLUSIONS = "success,neutral,failure,timed_out,action_required"
 #
 # Seeded with the gates this bundle touches, so every "mutation-checked per
 # CLOUD-418" obligation in it is cashed rather than cited.
-MUTANT_GATES = "land,land-lock,checks-green,ci-lease-precondition,finding-sink-check,issue-search-check,issue-search-guard,run-shape-guard,graph-check,board-move-guard"
+MUTANT_GATES = "land,land-lock,checks-green,ci-lease-precondition,finding-sink-check,issue-search-check,issue-search-guard,run-shape-guard,graph-check,board-move-guard,board-write-record"
 
 # --- GitHub reachability behind an egress proxy (Claude Code web sandbox etc.) ---
 # mise resolves every tool's release through GitHub's *API* host, api.github.com.
diff --git a/tests/board-write-record.bats b/tests/board-write-record.bats
new file mode 100644
index 000000000..7e7a0408c
--- /dev/null
+++ b/tests/board-write-record.bats
@@ -0,0 +1,211 @@
+#!/usr/bin/env bats
+# CLOUD-514 phase 1. The recorder that answers "what did this branch put on the
+# board, and was a new row refined when it was filed".
+#
+# Every test runs inside a throwaway `git init`, because the subject IS the git
+# dir: the record is keyed to the branch and stored under `$GIT_DIR`, so a suite
+# running in this repo's checkout would write records for a real session.
+
+setup() {
+	REC="$BATS_TEST_DIRNAME/../mise-tasks/board-write-record"
+	REPO="$BATS_TEST_TMPDIR/repo"
+	mkdir -p "$REPO"
+	git -C "$REPO" init --quiet
+	# Per fixture, never inherited — a CI runner carries no global identity, so a
+	# bare `git commit` here is `fatal: empty ident name` and fails only there.
+	# Measured on CLOUD-513, which cost a full CI run; that gate is filed and
+	# unfixed, so this stays hand-written in every fixture suite.
+	git -C "$REPO" config user.email t@example.com
+	git -C "$REPO" config user.name t
+	git -C "$REPO" commit -q --allow-empty -m init
+	cd "$REPO" || return 1
+}
+
+record() {
+	local branch
+	branch=$(git symbolic-ref --quiet --short HEAD)
+	printf '%s\n' "$(git rev-parse --git-dir)/batten-receipts/board-writes.${branch//\//-}"
+}
+
+# A Ready block that satisfies `ready-lint`'s checkable clauses. Kept minimal on
+# purpose: this suite is about the recorder, and the lint has its own.
+ready_body() {
+	cat <<'BODY'
+**Why**
+
+A thing is broken.
+
+**Refinement — Ready**
+
+* **Source of truth (§1).** A file.
+* **Mechanism as a computable predicate (§2).** A grep with an exit code.
+* **Effect (§3).** `read`.
+* **Output & exit contract (§5).** Pointer-only.
+* **Commit / bump (§6).** `fix(thing)` — patch until `0.1.0`.
+* **Test obligation (§7).** A bats row, shown able to fail.
+* **Blockers (§8).** None.
+BODY
+}
+
+# The payload goes through a FILE, and the helper prints its path. Embedding JSON
+# into a `bash -c` string lets the shell reinterpret its braces and quotes before
+# the body ever sees it.
+#
+# `tool_response` is the CONTENT-BLOCK envelope an MCP tool actually returns, not
+# the flat object the docs illustrate with a Write. That distinction is the whole
+# reason this suite exists.
+#
+# `blockers` is a SPACE-SEPARATED list, not JSON: the helper is called inside a
+# `bash -c` string, so a bracketed literal arrives with its quoting mangled and
+# `--argjson` rejects it. jq builds the array instead.
+event() {
+	local tool="${1:-mcp__Linear__save_issue}" body="${2:-}" blockers="${3:-}" input_id="${4:-}"
+	[ -n "$body" ] || body=$(ready_body)
+	jq -nc \
+		--arg t "$tool" --arg b "$body" --arg iid "$input_id" --arg blockers "$blockers" '
+		{
+		  tool_name: $t,
+		  tool_input: ({title: "a finding",
+		                blockedBy: ($blockers | split(" ") | map(select(length > 0)))}
+		               + (if $iid == "" then {} else {id: $iid} end)),
+		  tool_response: [{type: "text", text: ({
+		      id: "CLOUD-999", title: "a finding",
+		      description: $b, updatedAt: "2026-08-13T00:00:00.000Z"
+		    } | tojson)}]
+		}' >"$BATS_TEST_TMPDIR/event.json"
+	printf '%s\n' "$BATS_TEST_TMPDIR/event.json"
+}
+
+# --- what gets recorded --------------------------------------------------------
+
+@test "a created row is recorded with its id, updatedAt and a green verdict" {
+	run bash -c "'$REC' < $(event)"
+	[ "$status" -eq 0 ]
+	[ -f "$(record)" ]
+	run cat "$(record)"
+	[[ "$output" == "issue CLOUD-999 2026-08-13T00:00:00.000Z ready" ]]
+}
+
+# THE ROW THIS DESIGN TURNS ON. `ready-lint`'s §8 rule cross-checks prose claiming
+# a blocker against the payload's relations, and the create RESPONSE carries no
+# relations at all. Linting the response alone therefore reports
+# blocker-cited-without-relation on exactly the rows refined most carefully. The
+# create call's own `blockedBy` argument is the whole relation set on a create, so
+# it is what the synthesis uses.
+@test "a row whose §8 claims a blocker still records a green verdict" {
+	local body
+	body=$(ready_body | sed 's/\*\*Blockers (§8).\*\* None./**Blockers (§8).** `blockedBy` CLOUD-1./')
+	run bash -c "'$REC' < $(event mcp__Linear__save_issue "$body" CLOUD-1)"
+	[ "$status" -eq 0 ]
+	run cat "$(record)"
+	[[ "$output" == *" ready" ]]
+}
+
+@test "an unrefined row records a verdict of unready rather than being refused" {
+	run bash -c "'$REC' < $(event mcp__Linear__save_issue 'Just a sentence, no Ready block.')"
+	[ "$status" -eq 0 ]
+	[ -z "$output" ]
+	run cat "$(record)"
+	[[ "$output" == *" unready" ]]
+}
+
+# An update is not a board write this branch is answerable for. Recording it
+# would inflate the very count the gate gets specified against.
+@test "updating an existing row is never recorded" {
+	run bash -c "'$REC' < $(event mcp__Linear__save_issue '' '' CLOUD-1)"
+	[ "$status" -eq 0 ]
+	[ ! -f "$(record)" ]
+}
+
+# Sink 2: recorded so the create-versus-comment ratio is observable, never judged.
+@test "a comment is recorded as a comment and carries no verdict" {
+	run bash -c "'$REC' < $(event mcp__Linear__save_comment)"
+	[ "$status" -eq 0 ]
+	run cat "$(record)"
+	[[ "$output" == "comment CLOUD-999 2026-08-13T00:00:00.000Z -" ]]
+}
+
+# CLOUD-178 measured the same connector under three names depending on the
+# registration episode; a rule naming one matches none of the others, silently.
+@test "all three live connector spellings are recorded identically" {
+	local tool
+	for tool in mcp__Linear__save_issue mcp__claude_ai_Linear__save_issue mcp__4db58e41-0000-0000-0000-000000000000__save_issue; do
+		rm -f "$(record)"
+		run bash -c "'$REC' < $(event "$tool")"
+		[ "$status" -eq 0 ]
+		run cat "$(record)"
+		[[ "$output" == "issue CLOUD-999"* ]]
+	done
+}
+
+@test "a tool that does not write to the board is never recorded" {
+	local tool
+	for tool in mcp__Linear__list_issues Bash Write mcp__serena__write_memory; do
+		run bash -c "'$REC' < $(event "$tool")"
+		[ "$status" -eq 0 ]
+		[ ! -f "$(record)" ]
+	done
+}
+
+# --- pointer-only, and failing open -------------------------------------------
+
+# Not decorative: the text this reads is the entire issue body. Four fields reach
+# the file and nothing is ever printed (non-negotiable 4).
+@test "POINTER, NEVER PAYLOAD: no byte of the description reaches the record" {
+	run bash -c "'$REC' < $(event mcp__Linear__save_issue 'SECRETMARKER in the body')"
+	[ -z "$output" ]
+	run cat "$(record)"
+	[[ "$output" != *"SECRETMARKER"* ]]
+	[ "$(wc -l <"$(record)")" -eq 1 ]
+}
+
+@test "FAIL OPEN: an unreadable, nameless or resultless payload records nothing and says nothing" {
+	local payload
+	for payload in 'not json' '{}' '{"tool_name":""}' '' '{"tool_name":"mcp__Linear__save_issue"}'; do
+		run bash -c "printf '%s' $(printf '%q' "$payload") | '$REC'"
+		[ "$status" -eq 0 ]
+		[ -z "$output" ]
+		[ ! -f "$(record)" ]
+	done
+}
+
+# The flat shape the docs illustrate with a Write. A body written against it would
+# silently record nothing, which is why the envelope was measured.
+@test "FAIL OPEN: a flat tool_response is not the MCP envelope and records nothing" {
+	run bash -c "jq -nc '{tool_name:\"mcp__Linear__save_issue\",tool_input:{title:\"x\"},tool_response:{id:\"CLOUD-9\"}}' | '$REC'"
+	[ "$status" -eq 0 ]
+	[ ! -f "$(record)" ]
+}
+
+@test "FAIL OPEN: a detached HEAD has no branch to key a record to" {
+	git checkout -q --detach
+	run bash -c "'$REC' < $(event)"
+	[ "$status" -eq 0 ]
+	[ -z "$output" ]
+}
+
+@test "FAIL OPEN: outside a git repository nothing is recorded and nothing is blocked" {
+	cd "$BATS_TEST_TMPDIR" || return 1
+	run bash -c "env GIT_CEILING_DIRECTORIES='$BATS_TEST_TMPDIR' '$REC' < $(event)"
+	[ "$status" -eq 0 ]
+	[ -z "$output" ]
+}
+
+@test "the bypass is honoured" {
+	run bash -c "BATTEN_BOARD_WRITE_BYPASS=1 '$REC' < $(event)"
+	[ "$status" -eq 0 ]
+	[ ! -f "$(record)" ]
+}
+
+# --- the wiring ----------------------------------------------------------------
+
+# A body no matcher reaches is inert, and the miss is silent. Suffix-anchored for
+# CLOUD-178's reason, asserted here because this file cannot enforce it.
+@test "the settings entry is wired, on a suffix-anchored PostToolUse matcher" {
+	local settings="$BATS_TEST_DIRNAME/../.claude/settings.json"
+	run jq -r '[.hooks.PostToolUse[] | select(.hooks[].command | test("board-write-record")) | .matcher] | first' "$settings"
+	[ "$status" -eq 0 ]
+	[[ "$output" == *"save_issue"* ]]
+	[[ "$output" == *"save_comment"* ]]
+	[[ "$output" != "mcp__Linear__"* ]]
+}