diff --git a/README.md b/README.md
index c2881d5..e474e07 100644
--- a/README.md
+++ b/README.md
@@ -114,10 +114,18 @@ npm run demo -- --agents               # with the agent layer on (see AGENTS.md)
 A redelivery costs nothing, and the check that stops it runs *before* the first token is spent
 rather than discarding a finished run at the end.
 
-**`--board-writes` has no recorded cassettes and will not replay offline.** The flag is real (see
-[AGENTS.md](AGENTS.md)), but recording that mode needs live API keys against both providers, so
-`npm run demo -- --agents --board-writes` stops on a missing cassette rather than running green
-having done nothing. That error is the intended behaviour, not a broken build.
+**The board agent can also do the writing, and that replays offline too:**
+
+```bash
+npm run demo -- --agents --board-writes   # PRD §5's "authority to write", the shape production runs
+```
+
+Worth watching rather than skimming. The agent reads the cards and their comment history *before*
+writing, then departs from the plan where the board tells it something the pipeline could not — on
+`01-meeting-mixed` it comments on the duplicate's card instead of silently skipping it, and files the
+email copy as a subtask of the redesign it had just read. Every write it originates is re-run through
+the same deterministic gates first, so one the gates refuse becomes a hold rather than a card. Off by
+default; see [AGENTS.md](AGENTS.md) and [SECURITY.md](SECURITY.md) for what each mode guarantees.
 
 ```
 ▶ 01-meeting-mixed — A normal standup: four categories exercised, four cards created, one duplicate
diff --git a/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-1.json b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-1.json
new file mode 100644
index 0000000..92021ed
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-1.json
@@ -0,0 +1,12 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_01HGMH6E5yjhkbDk7KMAWzd2",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t200"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-1.json.sha b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-1.json.sha
new file mode 100644
index 0000000..c2da385
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+bebc72d6a42d
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-2.json b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-2.json
new file mode 100644
index 0000000..f777d55
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-2.json
@@ -0,0 +1,33 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_01F9TqfjGHTutbqfWR29AG6q",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t200",
+        "body": "Rate limiting sign-off pending."
+      }
+    },
+    {
+      "id": "toolu_017k9qZfz7DFk7pNJrVm8vpx",
+      "name": "create_task",
+      "arguments": {
+        "title": "Add request-size cap on upload endpoint",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Add a request-size cap on the upload endpoint to prevent oversized uploads."
+      }
+    },
+    {
+      "id": "toolu_01URuuNrGnqASXeubumyUosS",
+      "name": "create_task",
+      "arguments": {
+        "title": "Write spec for usage-based billing idea",
+        "list_key": "product",
+        "assignee": "Jules Kim",
+        "description": "Write a spec exploring the usage-based billing idea."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-2.json.sha b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-2.json.sha
new file mode 100644
index 0000000..3d76c82
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+4bd62dfb246d
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-3.txt b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-3.txt
new file mode 100644
index 0000000..01a2065
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-3.txt
@@ -0,0 +1 @@
+All three items have been written to the board.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-3.txt.sha b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..b0c05a9
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/01-meeting-mixed/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+cb2abfbd908e
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-1.json b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-1.json
new file mode 100644
index 0000000..25bf1b0
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-1.json
@@ -0,0 +1,19 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_01FAMhpQbuN8Gtp58bcoJx4P",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t500"
+      }
+    },
+    {
+      "id": "toolu_0162ggDZvNBA224ZuQ7ExvmB",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t600"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-1.json.sha b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-1.json.sha
new file mode 100644
index 0000000..0ec4d60
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+c60b0d4cab3e
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-2.json b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-2.json
new file mode 100644
index 0000000..ef7dba1
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-2.json
@@ -0,0 +1,21 @@
+{
+  "text": "Both items are duplicates of existing cards. I'll comment on each rather than create new cards.",
+  "toolCalls": [
+    {
+      "id": "toolu_01Rf1qepasrCmkw3GFFVCTGH",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t500",
+        "body": "Duplicate reported: \"Own onboarding revamp\" — this is the same work as this card (first-run experience for new signups). Tracking here instead of a new card."
+      }
+    },
+    {
+      "id": "toolu_015xtxhC1nJN8syLrnmkHqg8",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t600",
+        "body": "Duplicate reported: \"Handle partial deploy failures in pipeline\" — this is the same work as this card (deploy pipeline resilience to partial failures). Tracking here instead of a new card."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-2.json.sha b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-2.json.sha
new file mode 100644
index 0000000..cbbd874
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+cd4208ee9b24
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-3.txt b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-3.txt
new file mode 100644
index 0000000..d432c88
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-3.txt
@@ -0,0 +1 @@
+Both items accounted for as duplicates via comments on t500 and t600.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-3.txt.sha b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..cf0bcce
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/02-meeting-duplicates/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+88b83a5bdc0a
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-1.json b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-1.json
new file mode 100644
index 0000000..b506c30
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-1.json
@@ -0,0 +1,12 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_012ayRxi2JsPjr68i4tJVSPE",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t800"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-1.json.sha b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-1.json.sha
new file mode 100644
index 0000000..a0ac90e
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+57c5d925be9b
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-2.json b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-2.json
new file mode 100644
index 0000000..1a18434
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-2.json
@@ -0,0 +1,33 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_01LWknZHU4WMqSmDbg6MNa4N",
+      "name": "create_task",
+      "arguments": {
+        "title": "Raise connection pool size and add alert",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Increase database/service connection pool size to handle load, and add an alert to monitor pool saturation going forward."
+      }
+    },
+    {
+      "id": "toolu_011AM4bDVpfYCfQ1f6VezmTE",
+      "name": "create_task",
+      "arguments": {
+        "title": "Write runbook documentation",
+        "list_key": "backend",
+        "assignee": "Sky Patel",
+        "description": "Document operational runbook covering common issues, diagnostics, and remediation steps."
+      }
+    },
+    {
+      "id": "toolu_01FJrtFAFkN2azke2uQHD72w",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t800",
+        "body": "Status update: search relevance tuning work is ongoing."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-2.json.sha b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-2.json.sha
new file mode 100644
index 0000000..7849c27
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+8cd00873ce55
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-3.txt b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-3.txt
new file mode 100644
index 0000000..bcd8995
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-3.txt
@@ -0,0 +1 @@
+All three items have been written to the board successfully.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-3.txt.sha b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..03c5807
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/04-channel-messages/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+e35c54adc857
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-1.json b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-1.json
new file mode 100644
index 0000000..8fa46b3
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-1.json
@@ -0,0 +1,15 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_018jAs3kiPpqNa6ASuEZfxrC",
+      "name": "create_task",
+      "arguments": {
+        "title": "Fix billing invoice API endpoint field bug",
+        "list_key": "backend",
+        "assignee": "Rowan Diaz",
+        "description": "Fix a field bug in the billing invoice API endpoint."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-1.json.sha b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-1.json.sha
new file mode 100644
index 0000000..e179715
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+c3f3dcb0b8c3
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-2.txt b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-2.txt
new file mode 100644
index 0000000..ff81b53
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-2.txt
@@ -0,0 +1 @@
+Created as mem-0001.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-2.txt.sha b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-2.txt.sha
new file mode 100644
index 0000000..5cfad94
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/05-corrections/board/write/turn-2.txt.sha
@@ -0,0 +1 @@
+a76958643bfa
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-1.json b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-1.json
new file mode 100644
index 0000000..dcf2179
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-1.json
@@ -0,0 +1,19 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_01EWT7XxBsdTvyN2SJQNhfqf",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t901"
+      }
+    },
+    {
+      "id": "toolu_01RzkJ74ifkEqKUdcywDWLJP",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t900"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-1.json.sha b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-1.json.sha
new file mode 100644
index 0000000..64995f8
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+956191932ed7
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-2.json b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-2.json
new file mode 100644
index 0000000..1a56c5c
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-2.json
@@ -0,0 +1,19 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_0184zXNXoP8t2W4asKQYoUnt",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t901"
+      }
+    },
+    {
+      "id": "toolu_01E829bgrHRKExGHm3e2N1xJ",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t900"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-2.json.sha b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-2.json.sha
new file mode 100644
index 0000000..ecfa0d7
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+98e01d9ea856
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-3.json b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-3.json
new file mode 100644
index 0000000..1d156d6
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-3.json
@@ -0,0 +1,34 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_01J871fZzogMyY8bDfHSheRf",
+      "name": "create_task",
+      "arguments": {
+        "title": "Build rate limit usage dashboard",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Build a dashboard to visualize per-key API usage against rate limits, to help monitor and tune limits once rate limiting ships."
+      }
+    },
+    {
+      "id": "toolu_01VC88djTumtVy1PtyBDRfrX",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t901",
+        "body": "Refactor settings module: proceeding as tidy-up only, no behaviour change, per plan."
+      }
+    },
+    {
+      "id": "toolu_01KN47a4wv4SLptQmgoRPr1p",
+      "name": "create_task",
+      "arguments": {
+        "title": "Fix off-by-one in the retry backoff",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Retry backoff calculation has an off-by-one error, contributing to the retry-loop overload issue described in the parent rate limiting task.",
+        "parent_id": "t900"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-3.json.sha b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-3.json.sha
new file mode 100644
index 0000000..ece7004
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-3.json.sha
@@ -0,0 +1 @@
+fc279551be94
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-4.txt b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-4.txt
new file mode 100644
index 0000000..b189d13
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-4.txt
@@ -0,0 +1 @@
+All three items written: new dashboard task created, settings cleanup update logged as a comment on t901, and the retry backoff fix created as a subtask of t900.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-4.txt.sha b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-4.txt.sha
new file mode 100644
index 0000000..8cc71f3
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/06-github-activity/board/write/turn-4.txt.sha
@@ -0,0 +1 @@
+2be68a247355
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-1.json b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-1.json
new file mode 100644
index 0000000..b118085
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-1.json
@@ -0,0 +1,15 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "toolu_0186JYcEQMtmDaFwqnUQCzm4",
+      "name": "create_task",
+      "arguments": {
+        "title": "Add pagination to export endpoint",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Add pagination support to the export endpoint to handle large result sets efficiently."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-1.json.sha b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-1.json.sha
new file mode 100644
index 0000000..0447bf3
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+18f8205132af
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-2.txt b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-2.txt
new file mode 100644
index 0000000..8e3ad53
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-2.txt
@@ -0,0 +1 @@
+Task written to the board.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-2.txt.sha b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-2.txt.sha
new file mode 100644
index 0000000..3514d15
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/07-email-thread/board/write/turn-2.txt.sha
@@ -0,0 +1 @@
+6c5f2ea2f7cb
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/08-drive-activity/board/write/turn-1.txt b/fixtures/cassettes-agents-anthropic/08-drive-activity/board/write/turn-1.txt
new file mode 100644
index 0000000..b760fdb
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/08-drive-activity/board/write/turn-1.txt
@@ -0,0 +1 @@
+No items were listed under the pipeline's decisions section — there is nothing to write to the board. Since the task is empty, there's nothing to reconcile against the existing card (t920), and no action is needed.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents-anthropic/08-drive-activity/board/write/turn-1.txt.sha b/fixtures/cassettes-agents-anthropic/08-drive-activity/board/write/turn-1.txt.sha
new file mode 100644
index 0000000..d2e3901
--- /dev/null
+++ b/fixtures/cassettes-agents-anthropic/08-drive-activity/board/write/turn-1.txt.sha
@@ -0,0 +1 @@
+8a92318e473c
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-1.json b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-1.json
new file mode 100644
index 0000000..c8cfcd6
--- /dev/null
+++ b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-1.json
@@ -0,0 +1,47 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_yMj3lgtFZpwRYLClWztX0716",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t100"
+      }
+    },
+    {
+      "id": "call_01_xxZWYBmhme2Jznem4iJg9805",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t200"
+      }
+    },
+    {
+      "id": "call_02_4HjHHTZuhCpekQ1GmGZJ0984",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t300"
+      }
+    },
+    {
+      "id": "call_03_DRFP3TYcf5IGiLD5GPG33727",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t100"
+      }
+    },
+    {
+      "id": "call_04_t7fOMwqZTZb3u2QOl9rZ8162",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t200"
+      }
+    },
+    {
+      "id": "call_05_vWvn4BmbjY2fNv7XbQiL0478",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t300"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-1.json.sha b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-1.json.sha
new file mode 100644
index 0000000..2d2044d
--- /dev/null
+++ b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+969bf48a0070
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-2.json b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-2.json
new file mode 100644
index 0000000..e8915c0
--- /dev/null
+++ b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-2.json
@@ -0,0 +1,52 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_ecCSAu6kJP5TiaVIlCuj0017",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t200",
+        "body": "Update: ship Public API rate limiting this Friday."
+      }
+    },
+    {
+      "id": "call_01_sD8qZVPDd1sWssuF6vnv2545",
+      "name": "create_task",
+      "arguments": {
+        "title": "Add a hard request-size cap to the upload endpoint",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Add a hard cap on request body size for the upload endpoint and reject requests over the limit."
+      }
+    },
+    {
+      "id": "call_02_ZtgN0G2i8n2R1S2pe88B0648",
+      "name": "create_task",
+      "arguments": {
+        "title": "Write welcome email copy for the onboarding revamp",
+        "list_key": "design",
+        "assignee": "Rowan Diaz",
+        "description": "Draft the welcome email copy that goes out to new users as part of the onboarding flow redesign.",
+        "parent_id": "t100"
+      }
+    },
+    {
+      "id": "call_03_yTdtIHst29wejYpGNTLk9243",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t300",
+        "body": "Duplicate item noted: \"Refresh pricing page copy this week\" is already covered by this card."
+      }
+    },
+    {
+      "id": "call_04_KE4hyMT05FKDSdgKjxCe7071",
+      "name": "create_task",
+      "arguments": {
+        "title": "Write a written spec for usage-based billing",
+        "list_key": "product",
+        "assignee": "Jules Kim",
+        "description": "Produce a written specification for usage-based billing."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-2.json.sha b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-2.json.sha
new file mode 100644
index 0000000..5347b2e
--- /dev/null
+++ b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+98122ddb4325
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-3.txt b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-3.txt
new file mode 100644
index 0000000..51100b5
--- /dev/null
+++ b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-3.txt
@@ -0,0 +1 @@
+All items have been written or accounted for.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-3.txt.sha b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..7eede20
--- /dev/null
+++ b/fixtures/cassettes-agents/01-meeting-mixed/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+4249cb9cc9e0
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-1.json b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-1.json
new file mode 100644
index 0000000..abb2925
--- /dev/null
+++ b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-1.json
@@ -0,0 +1,33 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_xYqNiToFVHHWwkW1QWKS7389",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t500"
+      }
+    },
+    {
+      "id": "call_01_hXS0pWiLOoM6dmLUkzOu5618",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t600"
+      }
+    },
+    {
+      "id": "call_02_S1y17injNETRTXABoiks5136",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t500"
+      }
+    },
+    {
+      "id": "call_03_O9gmszRVuP9twgR4hOVW1889",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t600"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-1.json.sha b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-1.json.sha
new file mode 100644
index 0000000..6cd84b2
--- /dev/null
+++ b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+a5e0178b663f
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-2.json b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-2.json
new file mode 100644
index 0000000..2e9f367
--- /dev/null
+++ b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-2.json
@@ -0,0 +1,21 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_4qmhTyGSsebeRhTl7mHF2253",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t500",
+        "body": "Pipeline flagged \"Own the onboarding revamp\" as a duplicate of this card — no new card created."
+      }
+    },
+    {
+      "id": "call_01_8Qy3nVSvSXBtH8ClTZar4522",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t600",
+        "body": "Pipeline flagged \"Make the pipeline handle partial failure properly\" as a duplicate of this card — no new card created."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-2.json.sha b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-2.json.sha
new file mode 100644
index 0000000..f012258
--- /dev/null
+++ b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+5a246d2e6436
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-3.txt b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-3.txt
new file mode 100644
index 0000000..81af80c
--- /dev/null
+++ b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-3.txt
@@ -0,0 +1 @@
+Both items were accounted for as duplicates of existing cards. I read t500 and t600 (and their comment histories) and added a comment to each card noting the pipeline's duplicate decision — no new cards were created.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-3.txt.sha b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..512485c
--- /dev/null
+++ b/fixtures/cassettes-agents/02-meeting-duplicates/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+cd8257df6a12
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/04-channel-messages/board/write/turn-1.json b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-1.json
new file mode 100644
index 0000000..361b47d
--- /dev/null
+++ b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-1.json
@@ -0,0 +1,40 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_p27lH6hsrRNbCFR7Fcs44473",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t800"
+      }
+    },
+    {
+      "id": "call_01_WstR976qXmTnPzmHPi3W4016",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t800"
+      }
+    },
+    {
+      "id": "call_02_EsFrxxZpCxvzpUcH3V3z7334",
+      "name": "search_tasks",
+      "arguments": {
+        "query": "pool size"
+      }
+    },
+    {
+      "id": "call_03_FL7qN8BwXXq1XgulaMei8384",
+      "name": "search_tasks",
+      "arguments": {
+        "query": "pool exhaustion"
+      }
+    },
+    {
+      "id": "call_04_0YsiySmUWDkUpZw0UD652246",
+      "name": "search_tasks",
+      "arguments": {
+        "query": "runbook"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/04-channel-messages/board/write/turn-1.json.sha b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-1.json.sha
new file mode 100644
index 0000000..c2ca34c
--- /dev/null
+++ b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+5cfd9c66dd62
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/04-channel-messages/board/write/turn-2.json b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-2.json
new file mode 100644
index 0000000..63b8ed3
--- /dev/null
+++ b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-2.json
@@ -0,0 +1,43 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_ZyTAmNC89OibhnlALza95576",
+      "name": "create_task",
+      "arguments": {
+        "title": "Raise the pool size",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Increase the connection pool size to reduce pool exhaustion events."
+      }
+    },
+    {
+      "id": "call_01_nEeDg28HRdA6ipEc6x7W7787",
+      "name": "create_task",
+      "arguments": {
+        "title": "Add an alert for connection pool exhaustion",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Add monitoring and alerting that fires when the connection pool is near exhaustion."
+      }
+    },
+    {
+      "id": "call_02_Kc2DwP97UjmCnS4NEQil4708",
+      "name": "create_task",
+      "arguments": {
+        "title": "Document the runbook for the pool exhaustion issue",
+        "list_key": "backend",
+        "assignee": "Sky Patel",
+        "description": "Write the operational runbook covering detection and remediation steps for connection pool exhaustion."
+      }
+    },
+    {
+      "id": "call_03_nxHH8tn8EsL1oL3ASQqc2755",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t800",
+        "body": "Review search relevance work: reviewing the current search relevance tuning changes for correctness and impact."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/04-channel-messages/board/write/turn-2.json.sha b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-2.json.sha
new file mode 100644
index 0000000..1d66499
--- /dev/null
+++ b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+2cf5e970e977
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/04-channel-messages/board/write/turn-3.txt b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-3.txt
new file mode 100644
index 0000000..69840e8
--- /dev/null
+++ b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-3.txt
@@ -0,0 +1 @@
+All four pipeline items have been written to the board.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/04-channel-messages/board/write/turn-3.txt.sha b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..6061161
--- /dev/null
+++ b/fixtures/cassettes-agents/04-channel-messages/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+f4b78d28018e
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/05-corrections/board/write/turn-1.json b/fixtures/cassettes-agents/05-corrections/board/write/turn-1.json
new file mode 100644
index 0000000..dfccc4b
--- /dev/null
+++ b/fixtures/cassettes-agents/05-corrections/board/write/turn-1.json
@@ -0,0 +1,19 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_mZvCo18rgaSrbdP6Ym4o2284",
+      "name": "search_tasks",
+      "arguments": {
+        "query": "billing invoice API endpoint totals"
+      }
+    },
+    {
+      "id": "call_01_6vZoiB9MXtPp2viWFMO30410",
+      "name": "search_tasks",
+      "arguments": {
+        "query": "invoice totals field"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/05-corrections/board/write/turn-1.json.sha b/fixtures/cassettes-agents/05-corrections/board/write/turn-1.json.sha
new file mode 100644
index 0000000..86b0b5e
--- /dev/null
+++ b/fixtures/cassettes-agents/05-corrections/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+87457ba67dce
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/05-corrections/board/write/turn-2.json b/fixtures/cassettes-agents/05-corrections/board/write/turn-2.json
new file mode 100644
index 0000000..9044ea9
--- /dev/null
+++ b/fixtures/cassettes-agents/05-corrections/board/write/turn-2.json
@@ -0,0 +1,15 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_sp7pq5pTNcPGL1QWMaWy7411",
+      "name": "create_task",
+      "arguments": {
+        "title": "Fix the billing invoice API endpoint totals field",
+        "list_key": "backend",
+        "assignee": "Rowan Diaz",
+        "description": "Fix the totals field on the billing invoice API endpoint so it returns the correct computed value."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/05-corrections/board/write/turn-2.json.sha b/fixtures/cassettes-agents/05-corrections/board/write/turn-2.json.sha
new file mode 100644
index 0000000..4ab1c71
--- /dev/null
+++ b/fixtures/cassettes-agents/05-corrections/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+1025026afcf0
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/05-corrections/board/write/turn-3.txt b/fixtures/cassettes-agents/05-corrections/board/write/turn-3.txt
new file mode 100644
index 0000000..3925a0d
--- /dev/null
+++ b/fixtures/cassettes-agents/05-corrections/board/write/turn-3.txt
@@ -0,0 +1 @@
+Done.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/05-corrections/board/write/turn-3.txt.sha b/fixtures/cassettes-agents/05-corrections/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..a5c51b8
--- /dev/null
+++ b/fixtures/cassettes-agents/05-corrections/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+bcf094983e5e
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-1.json b/fixtures/cassettes-agents/06-github-activity/board/write/turn-1.json
new file mode 100644
index 0000000..f44c059
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-1.json
@@ -0,0 +1,12 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_HYO9BBzy856KYp5BKjNB4924",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t901"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-1.json.sha b/fixtures/cassettes-agents/06-github-activity/board/write/turn-1.json.sha
new file mode 100644
index 0000000..474ed2b
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+c41a50867e2e
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-2.json b/fixtures/cassettes-agents/06-github-activity/board/write/turn-2.json
new file mode 100644
index 0000000..69e187d
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-2.json
@@ -0,0 +1,12 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_FZGYPZcRdUeFPVVXCa7j1838",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t901"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-2.json.sha b/fixtures/cassettes-agents/06-github-activity/board/write/turn-2.json.sha
new file mode 100644
index 0000000..a1a517f
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+06ac15003c51
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-3.json b/fixtures/cassettes-agents/06-github-activity/board/write/turn-3.json
new file mode 100644
index 0000000..c21ded8
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-3.json
@@ -0,0 +1,13 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_bn5Wd1SWvOcECWWt0xmq8565",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t901",
+        "body": "UPDATE: Refactor the settings module. This card now covers the settings-module refactor rather than tidy-up only."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-3.json.sha b/fixtures/cassettes-agents/06-github-activity/board/write/turn-3.json.sha
new file mode 100644
index 0000000..cc66bf1
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-3.json.sha
@@ -0,0 +1 @@
+3c13c605835f
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-4.txt b/fixtures/cassettes-agents/06-github-activity/board/write/turn-4.txt
new file mode 100644
index 0000000..bb0be06
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-4.txt
@@ -0,0 +1 @@
+Done. The pipeline's update for t901 has been recorded on the existing card.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/06-github-activity/board/write/turn-4.txt.sha b/fixtures/cassettes-agents/06-github-activity/board/write/turn-4.txt.sha
new file mode 100644
index 0000000..6051b65
--- /dev/null
+++ b/fixtures/cassettes-agents/06-github-activity/board/write/turn-4.txt.sha
@@ -0,0 +1 @@
+65d2ecfe4e5b
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-1.json b/fixtures/cassettes-agents/07-email-thread/board/write/turn-1.json
new file mode 100644
index 0000000..a343f8b
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-1.json
@@ -0,0 +1,19 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_rapQQiMz98fJNSOj5whP6934",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t910"
+      }
+    },
+    {
+      "id": "call_01_hOEhhl1UFeXe09Ca7U582883",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t910"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-1.json.sha b/fixtures/cassettes-agents/07-email-thread/board/write/turn-1.json.sha
new file mode 100644
index 0000000..a94ce8b
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+5f77380fd074
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-2.json b/fixtures/cassettes-agents/07-email-thread/board/write/turn-2.json
new file mode 100644
index 0000000..9297c91
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-2.json
@@ -0,0 +1,19 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_2zT7WKDgxyJjh2kTF2Y19043",
+      "name": "search_tasks",
+      "arguments": {
+        "query": "pagination"
+      }
+    },
+    {
+      "id": "call_01_rfqxtNgFrMZ2QsuajDDU9730",
+      "name": "search_tasks",
+      "arguments": {
+        "query": "export endpoint"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-2.json.sha b/fixtures/cassettes-agents/07-email-thread/board/write/turn-2.json.sha
new file mode 100644
index 0000000..7d51b2d
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+09ea667df315
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-3.json b/fixtures/cassettes-agents/07-email-thread/board/write/turn-3.json
new file mode 100644
index 0000000..e5a1adc
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-3.json
@@ -0,0 +1,23 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_DkmmNn8Vz3Mz3UCAem812034",
+      "name": "create_task",
+      "arguments": {
+        "title": "Add pagination to export endpoint",
+        "list_key": "backend",
+        "assignee": "Avery Chen",
+        "description": "Add pagination support to the export endpoint so large result sets are returned in pages rather than a single response."
+      }
+    },
+    {
+      "id": "call_01_JvBedSpvbFFENzsPpIkB6986",
+      "name": "add_comment",
+      "arguments": {
+        "task_id": "t910",
+        "body": "Go-live confirmed for 28 August (already reflected in the card description)."
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-3.json.sha b/fixtures/cassettes-agents/07-email-thread/board/write/turn-3.json.sha
new file mode 100644
index 0000000..6a01048
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-3.json.sha
@@ -0,0 +1 @@
+6398e6340490
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-4.txt b/fixtures/cassettes-agents/07-email-thread/board/write/turn-4.txt
new file mode 100644
index 0000000..8d66021
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-4.txt
@@ -0,0 +1,4 @@
+Both items are written:
+
+- t910: the go-live on 28 August was already in the card description, so I commented on t910 rather than duplicating the work.
+- New card created: "Add pagination to export endpoint" in `backend`, assigned to Avery Chen.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/07-email-thread/board/write/turn-4.txt.sha b/fixtures/cassettes-agents/07-email-thread/board/write/turn-4.txt.sha
new file mode 100644
index 0000000..a57d756
--- /dev/null
+++ b/fixtures/cassettes-agents/07-email-thread/board/write/turn-4.txt.sha
@@ -0,0 +1 @@
+b0e16a9944c9
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/08-drive-activity/board/write/turn-1.json b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-1.json
new file mode 100644
index 0000000..67a5345
--- /dev/null
+++ b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-1.json
@@ -0,0 +1,19 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_i9l2YuY4pdtMu8iGiCPo7897",
+      "name": "get_task",
+      "arguments": {
+        "task_id": "t920"
+      }
+    },
+    {
+      "id": "call_01_2IxmHuPusiApxkCvWYY22234",
+      "name": "get_task_comments",
+      "arguments": {
+        "task_id": "t920"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/08-drive-activity/board/write/turn-1.json.sha b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-1.json.sha
new file mode 100644
index 0000000..f26108d
--- /dev/null
+++ b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-1.json.sha
@@ -0,0 +1 @@
+c1f8883b992e
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/08-drive-activity/board/write/turn-2.json b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-2.json
new file mode 100644
index 0000000..15ec18c
--- /dev/null
+++ b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-2.json
@@ -0,0 +1,27 @@
+{
+  "text": "",
+  "toolCalls": [
+    {
+      "id": "call_00_OmuIcuDVhHcZK60xG9aC2193",
+      "name": "create_task",
+      "arguments": {
+        "title": "Add declined-card and expired-session error state screens to the spec",
+        "list_key": "design",
+        "assignee": "Rowan Diaz",
+        "description": "Add declined-card and expired-session error state screens to the checkout redesign spec, ahead of engineering pickup.",
+        "parent_id": "t920"
+      }
+    },
+    {
+      "id": "call_01_avrpCbo7FpXsw3DhpBi78184",
+      "name": "create_task",
+      "arguments": {
+        "title": "Fix the 'reciept' typo in the second paragraph",
+        "list_key": "design",
+        "assignee": "Rowan Diaz",
+        "description": "Fix the 'reciept' typo in the second paragraph of the checkout redesign spec.",
+        "parent_id": "t920"
+      }
+    }
+  ]
+}
diff --git a/fixtures/cassettes-agents/08-drive-activity/board/write/turn-2.json.sha b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-2.json.sha
new file mode 100644
index 0000000..512a4b7
--- /dev/null
+++ b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-2.json.sha
@@ -0,0 +1 @@
+5718f8d3e39c
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/08-drive-activity/board/write/turn-3.txt b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-3.txt
new file mode 100644
index 0000000..8736dc9
--- /dev/null
+++ b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-3.txt
@@ -0,0 +1 @@
+Both planned items have been written to the board as subtasks of t920.
\ No newline at end of file
diff --git a/fixtures/cassettes-agents/08-drive-activity/board/write/turn-3.txt.sha b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-3.txt.sha
new file mode 100644
index 0000000..aaba0cc
--- /dev/null
+++ b/fixtures/cassettes-agents/08-drive-activity/board/write/turn-3.txt.sha
@@ -0,0 +1 @@
+fc064a5e6502
\ No newline at end of file
diff --git a/src/agents/boardAgent.ts b/src/agents/boardAgent.ts
index f910177..ccdb79a 100644
--- a/src/agents/boardAgent.ts
+++ b/src/agents/boardAgent.ts
@@ -26,7 +26,7 @@
 import { type ExecuteResult, type ExecutedAction, type PlanContext, planOperations } from '../pipeline/passes/execute';
 import type { CategorizationItem } from '../pipeline/parsing/categorizationManifest';
 import type { HeldItem } from '../pipeline/gates/contractGates';
-import { approvedOpSet, governedTracker } from '../pipeline/gates/governedTracker';
+import { approvedOpSet, governedTracker, opSignature } from '../pipeline/gates/governedTracker';
 import type { DeterministicGateOptions } from '../pipeline/passes/contractCheck';
 import { READ_ONLY_TOOLS, WRITE_TOOLS, makeToolLoopRunner } from '../pipeline/toolLoop';
 import { screenedPrimary } from '../utils/security';
@@ -298,16 +298,37 @@ export function buildBoardWritePrompt(items: CategorizationItem[], boardText: st
   ].join('\n');
 }
 
+/**
+ * Do two operations of the same kind concern the same thing?
+ *
+ * Deliberately coarse — the card id for anything touching an existing card, the exact title for a
+ * create. It answers "did the agent do this item's work", not "did it do it the way we planned",
+ * because the second question is Pass 2d's and it should get to ask it independently.
+ */
+function sameTarget(a: TrackerOperation, b: TrackerOperation): boolean {
+  const target = (op: TrackerOperation): string =>
+    'taskId' in op ? op.taskId : op.kind === 'createTask' ? op.title.trim().toLowerCase() : '';
+  const t = target(a);
+  return t !== '' && t === target(b);
+}
+
 /** Fold the operations the tracker actually performed back into per-action results. */
 function tally(plan: ReturnType<typeof planOperations>, performed: Array<{ op: TrackerOperation; outcome: OpOutcome }>): ExecuteResult {
   const counts = { created: 0, commented: 0, skipped: 0, refused: 0, failed: 0, unsupported: 0 };
   const left = [...performed];
 
   const actions: ExecutedAction[] = plan.map((action) => {
-    // An op belongs to the action that planned it. Agent-originated ops match nothing here and are
-    // gathered into their own action below rather than being silently attributed to a planned item.
+    // An op belongs to the action that planned it — matched first exactly, then by **target**.
+    //
+    // Exact-only matching was a bug with a misleading symptom. The agent is invited to reword, so it
+    // commented on the right card with its own phrasing; the signature did not match, the op fell
+    // into the agent-originated bucket, and Pass 2d then reported "no comment landed on t200" for a
+    // comment that had demonstrably landed on t200. The write was fine and the *attribution* was
+    // wrong, which is the worse of the two failures to ship: it makes a working run look broken and
+    // trains a reader to discount the audit.
     const results = action.ops.flatMap((planned) => {
-      const i = left.findIndex((p) => p.op === planned || JSON.stringify(p.op) === JSON.stringify(planned));
+      let i = left.findIndex((p) => opSignature(p.op) === opSignature(planned));
+      if (i === -1) i = left.findIndex((p) => p.op.kind === planned.kind && sameTarget(p.op, planned));
       return i === -1 ? [] : left.splice(i, 1);
     });
     return { ...action, results, ok: results.length > 0 && results.every((r) => r.outcome.status === 'applied' || r.outcome.status === 'unchanged') };
diff --git a/src/cli/record.ts b/src/cli/record.ts
index e9f93b4..2ff03bb 100644
--- a/src/cli/record.ts
+++ b/src/cli/record.ts
@@ -27,6 +27,10 @@ async function main(): Promise<void> {
   const provider = (arg('provider') ?? 'deepseek') as ProviderName;
   const fresh = process.argv.includes('--fresh');
   const agents = process.argv.includes('--agents');
+  // Records into the SAME agent set. The board-write turns are additional keys (`board/write/...`),
+  // not replacements, so every cassette recorded before this flag existed replays untouched and the
+  // two modes share one directory rather than doubling the sets to four.
+  const boardWrites = process.argv.includes('--board-writes');
   const scenarios = process.argv.includes('--all') ? listScenarios() : [arg('scenario') ?? ''].filter(Boolean);
 
   if (scenarios.length === 0) {
@@ -43,12 +47,15 @@ async function main(): Promise<void> {
     const dir = join(root, name);
     if (fresh) rmSync(dir, { recursive: true, force: true });
 
-    console.log(`\n▶ recording ${name} against ${provider}${agents ? ' (agent layer ON)' : ''}`);
+    console.log(
+      `\n▶ recording ${name} against ${provider}${agents ? ' (agent layer ON)' : ''}` +
+        `${boardWrites ? ' (board agent writes)' : ''}`
+    );
 
     // A miss records through the live provider; a hit replays. That makes re-running cheap and makes
     // a partially-recorded scenario finishable rather than all-or-nothing.
     const model = cassetteClient(dir, { record: makeModelClient({ provider }) });
-    const run = await runScenario(scenario, { model, agents });
+    const run = await runScenario(scenario, { model, agents, boardWrites });
 
     console.log(`  ${run.modelCalls} model call(s)`);
 
diff --git a/src/pipeline/toolLoop.ts b/src/pipeline/toolLoop.ts
index 289503b..75b0eb9 100644
--- a/src/pipeline/toolLoop.ts
+++ b/src/pipeline/toolLoop.ts
@@ -107,10 +107,22 @@ export const WRITE_TOOLS: ToolSpec[] = [
         title: { type: 'string' },
         list_key: { type: 'string', description: 'Which list the card belongs on.' },
         assignee: { type: 'string', description: 'Canonical name of the owner.' },
-        description: { type: 'string' },
-        parent_id: { type: 'string', description: 'Set to make this a subtask of an existing card.' },
+        description: {
+          type: 'string',
+          description: 'What the work actually is. Required — a card with no body is refused.',
+        },
+        parent_id: {
+          type: 'string',
+          description:
+            'Set to make this a subtask of an existing card. Read that card\'s comments first, or the ' +
+            'evidence gate refuses the write.',
+        },
       },
-      required: ['title', 'list_key', 'assignee'],
+      // `description` is required here because the gate requires it: a create with no FINAL_DESC is
+      // refused as an unresolvable field. Listing it optional made the tool lie about what a valid
+      // write looks like, and the model believed the tool — five refusals in one recorded run, every
+      // one of them the schema's fault rather than the model's.
+      required: ['title', 'list_key', 'assignee', 'description'],
     },
   },
   {