BriefMe

Change one block

update_block

DestructiveIdempotent

Changes one block, identified by block_id. Only the supplied fields change; anything omitted keeps its current value exactly, so a one-field edit is a one-field call.

Changes one block only: it does not reorder, add or remove anything, and there is no whole-agenda replace. get_agenda returns the current block ids. Returns the full updated agenda.

Input Schema

TableJSON Schema

Name	Required	Description
`title`	No	New title. Omit to leave unchanged.
`block_id`	Yes	The id of the block to change, from create_agenda or get_agenda.
`block_type`	No	New internal classification (aggregate analysis only; shown on no BriefMe page). Omit to leave unchanged.
`edit_token`	No	The latest edit_token (from create_agenda, or rotate_edit_token after a rotation). Authorizes on its own; needed unless the agenda is saved to a linked account.
`description`	No	New note. Send null to clear it. Omit to leave unchanged.
`share_token`	No	Agenda id (from create_agenda or list_agendas). Required with a linked account, optional beside edit_token.
`duration_seconds`	No	New duration in seconds. Omit to leave unchanged.

Output Schema

TableJSON Schema

Name	Required	Description
`title`	Yes
`blocks`	Yes	The blocks in the order they run.
`share_url`	Yes	The read-only agenda with the live timer; safe to give to attendees.
`expires_at`	Yes	ISO 8601. null when the agenda is saved to an account and does not expire.
`share_token`	Yes	The agenda's public identifier; what every tool takes as share_token.
`total_seconds`	Yes	Sum of every block's duration_seconds.

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedSep 29, 2026

changedInput schema / properties / edit_token / description

Previous value: -"The edit_token returned by create_agenda."New value: +"The latest edit_token (from create_agenda, or rotate_edit_token after a rotation). Authorizes on its own; needed unless the agenda is saved to a linked account."

addedInput schema / properties / share_token

Added value: +{
+  "description": "Agenda id (from create_agenda or list_agendas). Required with a linked account, optional beside edit_token.",
+  "type": "string"
+}

changedInput schema / required

Previous value: -[
-  "edit_token",
-  "block_id"
-]New value: +[
+  "block_id"
+]

changedOutput schema / properties / blocks / items / properties / block_type / description

Previous value: -"Internal classification; never mention it to the user."New value: +"Internal classification; appears on no BriefMe page."

addedOutput schema / properties / share_token

Added value: +{
+  "description": "The agenda's public identifier; what every tool takes as share_token.",
+  "type": "string"
+}

changedOutput schema / required

Previous value: -[
-  "title",
-  "total_seconds",
-  "expires_at",
-  "share_url",
-  "blocks"
-]New value: +[
+  "title",
+  "total_seconds",
+  "expires_at",
+  "share_token",
+  "share_url",
+  "blocks"
+]

Changed2 schema fields changedSep 11, 2026

changedInput schema / properties / block_type / description

Previous value: -"New internal classification. Omit to leave unchanged; never mention it to the user."New value: +"New internal classification (aggregate analysis only; shown on no BriefMe page). Omit to leave unchanged."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "blocks": {
+      "description": "The blocks in the order they run.",
+      "items": {
+        "properties": {
+          "block_type": {
+            "description": "Internal classification; never mention it to the user.",
+            "enum": [
+              "standup",
+              "discussion",
+              "decision",
+              "q_and_a",
+              "break",
+              "opening",
+              "closing",
+              "other",
+              null
+            ],
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "description": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "duration_seconds": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "id": {
+            "description": "Stable 8-letter id: what update_block, remove_block, reorder_blocks and after_block_id take.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "title": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "id",
+          "title",
+          "duration_seconds",
+          "block_type",
+          "description"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "expires_at": {
+      "description": "ISO 8601. null when the agenda is saved to an account and does not expire.",
+      "format": "date-time",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "share_url": {
+      "description": "The read-only agenda with the live timer; safe to give to attendees.",
+      "format": "uri",
+      "type": "string"
+    },
+    "title": {
+      "type": "string"
+    },
+    "total_seconds": {
+      "description": "Sum of every block's duration_seconds.",
+      "type": "integer"
+    }
+  },
+  "required": [
+    "title",
+    "total_seconds",
+    "expires_at",
+    "share_url",
+    "blocks"
+  ],
+  "type": "object"
+}

First observedSep 1, 2026

TDQS

A4.3/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Adds genuine semantics beyond the annotations: partial-update behavior ("Only the supplied fields change; anything omitted keeps its current value exactly"), so a one-field edit is safe and predictable, and it notes the return is the full updated agenda. With destructiveHint=true it would help to say explicitly that supplied fields overwrite prior values, but the idempotent/partial-update model is well conveyed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three short, front-loaded paragraphs with no filler; the scope exclusions and partial-update rule are stated early. Minor redundancy: the first and third sentences both restate "changes one block only," and the opening line largely echoes the title.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists and annotations cover idempotency/destructiveness, so the description's job is mostly scoping and update semantics, both of which it covers. The only soft spot is the phrase "there is no whole-agenda replace," which could be read as a global claim rather than a statement about this tool's behavior.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the baseline is 3; the description pushes above it by generalizing the omit-to-leave-unchanged contract across all optional fields, which is the key calling convention here. It does not discuss edit_token/share_token authorization, but the schema already documents those fully.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Opens with a specific verb+resource ("Changes one block, identified by block_id") and immediately scopes it against siblings: it does not reorder (reorder_blocks), add (add_block), or remove (remove_block) anything, and it is not a whole-agenda replace (update_agenda). An agent can route correctly without opening any schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states the boundary conditions (single block, no add/remove/reorder, no whole-agenda replace) and tells the agent where to get valid block ids (get_agenda). It stops short of explicitly naming update_agenda as the tool to use when a whole-agenda edit is actually wanted, leaving that inference to the agent.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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