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update_surface

Move or rename a surface, or adopt_session to rebind an existing managed Claude or Codex identity after a restart using pinned historical evidence and fresh process/topology proof.

Instructions

Move or rename a surface, or adopt_session to rebind an existing managed Claude or Codex identity after a restart using pinned historical evidence and fresh process/topology proof. Adoption changes no pane or input; layout reconciliation follows separately.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "action": "<action>",
      "surface": "<surface>"
    },
    "name": "update_surface"
  }
}

Input Schema

Name	Required	Description	Default
`cwd`	No
`pane`	No
`role`	No
`after`	No
`focus`	No
`index`	No
`model`	No
`title`	No
`action`	Yes
`before`	No
`surface`	Yes
`authority`	No
`placement`	No
`workspace`	No
`launch_cwd`	No
`session_id`	No
`collab_path`	No
`parent_agent_id`	No
`preserve_prefix`	No
`managed_agent_id`	No
`observer_transition`	No
`binding_evidence_path`	No
`expected_agent_version`	No
`binding_evidence_sha256`	No

Output Schema

Name	Required	Description	Default
`ok`	Yes
`pane`	No
`title`	No
`action`	No
`surface`	No
`workspace`	No
`retry_count`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed16 schema fields changedv0.4.106Oct 14, 2026

changedInput schema / properties / action / enum

Previous value: -[
-  "move",
-  "rename"
-]New value: +[
+  "move",
+  "rename",
+  "adopt_session"
+]

addedInput schema / properties / authority
```
Added value: +{
+  "not": {}
+}
```
addedInput schema / properties / binding_evidence_path
```
Added value: +{
+  "type": "string"
+}
```

addedInput schema / properties / binding_evidence_sha256

Added value: +{
+  "pattern": "^[a-f0-9]{64}$",
+  "type": "string"
+}

addedInput schema / properties / collab_path
```
Added value: +{
+  "not": {}
+}
```
addedInput schema / properties / cwd
```
Added value: +{
+  "not": {}
+}
```

addedInput schema / properties / expected_agent_version

Added value: +{
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / launch_cwd
```
Added value: +{
+  "not": {}
+}
```

addedInput schema / properties / managed_agent_id

Added value: +{
+  "minLength": 1,
+  "type": "string"
+}

addedInput schema / properties / model
```
Added value: +{
+  "not": {}
+}
```

addedInput schema / properties / observer_transition

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "current_owner_id": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "historical_owner_id": {
+      "minLength": 1,
+      "type": "string"
+    }
+  },
+  "required": [
+    "historical_owner_id",
+    "current_owner_id"
+  ],
+  "type": "object"
+}

addedInput schema / properties / parent_agent_id
```
Added value: +{
+  "not": {}
+}
```
addedInput schema / properties / placement
```
Added value: +{
+  "not": {}
+}
```
addedInput schema / properties / role
```
Added value: +{
+  "not": {}
+}
```

addedInput schema / properties / session_id

Added value: +{
+  "minLength": 1,
+  "type": "string"
+}

changedOutput schema / properties / action / enum

Previous value: -[
-  "move",
-  "rename"
-]New value: +[
+  "move",
+  "rename",
+  "adopt_session"
+]

Addedv0.4.88Sep 26, 2026

TDQS

B3.4/5.0

Behavior4/5

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

Annotations already declare the safety profile (not read-only, not destructive, not idempotent), so the bar is lower. The description still adds non-obvious behavior: adoption rebinds an identity without touching pane or input, requires pinned historical evidence plus fresh process/topology proof, and defers layout reconciliation to a separate step.

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?

Two dense but front-loaded sentences with essentially no filler; the primary actions lead and the adoption nuances follow. It is appropriately sized given the tool's complexity, though the second sentence's phrasing is slightly convoluted.

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

Completeness3/5

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

An output schema exists so return values need no explanation, and the adopt_session path is reasonably described. But for a 24-parameter tool with zero schema descriptions and three enum actions, the move/rename paths and most parameter semantics are unexplained, leaving real gaps.

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

Parameters2/5

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

Schema description coverage is 0% across 24 parameters, so the description must carry the burden and does not. It hints at the evidence/observer concepts (binding evidence, historical owner) but never explains surface, pane, index, before/after, preserve_prefix, workspace, or the observer_transition object, leaving most inputs opaque.

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

Purpose4/5

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

The description names three concrete actions (move, rename, adopt_session) against the 'surface' resource, so the agent knows what operation family it is entering. It is distinguishable from siblings like close_surface and list_surfaces by the mutate/rebind framing, though it never explicitly contrasts with them.

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

Usage Guidelines3/5

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

It gives a real usage condition for adopt_session ('after a restart ... using pinned historical evidence and fresh process/topology proof') and notes that layout reconciliation happens separately. However, move and rename receive no when-to-use guidance, and there are no exclusions or sibling routing hints.

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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