Unable to retrieve agent metadata using the Agent pseudo metadata type

### Summary
I'm trying to retrieve agent metadata via `sf project retrieve start --metadata "Agent:" but nothing is being retrieved. Instead I'm seeing an EPIPE error.

### Steps To Reproduce
1. Create a new Employee Agent
2. Try to retrieve this agent in a fresh sf project from the cli.

### Expected result
I'm expecting to have the agent metadata described in https://developer.salesforce.com/docs/einstein/genai/references/agents-metadata-tooling?utm_source=chatgpt.com retrieved to my local project.

### Actual result
This is the output I'm seeing:
```
~/C/sfdc on develop ⨯ sf project retrieve start --metadata "Agent:CR_Agent" 09:07:17

────────────── Retrieving Metadata ──────────────

Retrieving v64.0 metadata from kevin.do@x.devkev using the v65.0 SOAP API

✔ Preparing retrieve request 8ms
✘ Sending request to org 6m 6.77s
◼ Waiting for the org to respond
◼ Done

Status: ✘
Elapsed Time: 6m 6.78s

Error (EPIPE): request to https://x.sandbox.my.salesforce.com/services/Soap/m/65.0 failed, reason: write EPIPE

Warning: Unable to find type MktDataConnectionParam in registry
Warning: Unable to find type MktDataConnectionParam in registry
Warning: Unable to find type PolicyRuleDefinitionSet in registry
Warning: Unable to find type PolicyRuleDefinition in registry
Warning: Unable to find type MktDataConnectionParam in registry
Warning: Unable to find type MktDataConnectionParam in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
Warning: Unable to find type ExternalDataTranField in registry
⋊> ~/C/sfdc on develop ⨯
```

### System Information

```
CLI:
@salesforce/cli/2.106.6 darwin-arm64 node-v22.19.0

Plugin Version:
@oclif/plugin-autocomplete 3.2.34 (core)
@oclif/plugin-commands 4.1.32 (core)
@oclif/plugin-help 6.2.32 (core)
@oclif/plugin-not-found 3.2.67 (core)
@oclif/plugin-plugins 5.4.46 (core)
@oclif/plugin-search 1.2.28 (core)
@oclif/plugin-update 4.7.4 (core)
@oclif/plugin-version 2.2.32 (core)
@oclif/plugin-warn-if-update-available 3.1.46 (core)
@oclif/plugin-which 3.2.39 (core)
@salesforce/cli 2.106.6 (core)
@salesforce/lwc-dev-server 2.11.0 (link) /opt/homebrew/lib/node_modules/@salesforce/lwc-dev-server
agent 1.24.13 (user)
apex 3.6.19 (core)
api 1.3.3 (core)
auth 3.9.4 (core)
code-analyzer 5.4.0 (user)
data 4.0.55 (core)
deploy-retrieve 3.23.1 (core)
info 3.4.85 (core)
lightning-dev 3.5.1 (user)
limits 3.3.66 (core)
marketplace 1.3.8 (core)
org 5.9.28 (core)
packaging 2.20.1 (core)
schema 3.3.81 (core)
settings 2.4.46 (core)
sobject 1.4.72 (core)
telemetry 3.6.55 (core)
templates 56.3.63 (core)
trust 3.7.113 (core)
user 3.6.38 (core)
@salesforce/sfdx-plugin-lwc-test 1.2.1 (user)
sfdmu 4.38.0 (user)
```

```
SF ENV. VARS.
SF_BINPATH,/Users/kevin.do/.local/share/sf/client/bin/sf
SF_AUTOUPDATE_DISABLE,true
SF_DISABLE_AUTOUPDATE,true
SF_UPDATE_INSTRUCTIONS,Use "npm update --global @salesforce/cli" to update npm-based installations.
```

```
Windows: false
Shell: zsh
Channel: stable
```
---
### Diagnostics
:white_check_mark: pass - salesforcedx plugin isn’t installed
:x: fail - you have at least one linked plugin
:white_check_mark: pass - [@salesforce/plugin-trust] can ping: https://registry.npmjs.org
:white_check_mark: pass - [@salesforce/plugin-trust] can ping: https://registry.yarnpkg.com
:white_check_mark: pass - [@salesforce/plugin-trust] can ping: https://registry.npmjs.org/
:white_check_mark: pass - using latest or latest-rc CLI version
:white_check_mark: pass - [@salesforce/plugin-deploy-retrieve] sourceApiVersion matches apiVersion
:x: warn - [@salesforce/plugin-deploy-retrieve] sourceApiVersion matches default target org max apiVersion
:white_check_mark: pass - can access: https://test.salesforce.com
:white_check_mark: pass - can access: https://appexchange.salesforce.com/services/data
:white_check_mark: pass - can access: https://developer.salesforce.com/media/salesforce-cli/sf/channels/stable/sf-win32-x64-buildmanifest
:x: fail - [@salesforce/plugin-auth] CLI supports v2 crypto

```
{
"architecture": "darwin-arm64",
"cliVersion": "@salesforce/cli/2.106.6",
"nodeVersion": "node-v22.19.0",
"osVersion": "Darwin 24.6.0",
"rootPath": "/Users/kevin.do/.local/share/sf/client/2.106.6-c2615ca",
"shell": "zsh",
"pluginVersions": [
"@oclif/plugin-autocomplete 3.2.34 (core)",
"@oclif/plugin-commands 4.1.32 (core)",
"@oclif/plugin-help 6.2.32 (core)",
"@oclif/plugin-not-found 3.2.67 (core)",
"@oclif/plugin-plugins 5.4.46 (core)",
"@oclif/plugin-search 1.2.28 (core)",
"@oclif/plugin-update 4.7.4 (core)",
"@oclif/plugin-version 2.2.32 (core)",
"@oclif/plugin-warn-if-update-available 3.1.46 (core)",
"@oclif/plugin-which 3.2.39 (core)",
"@salesforce/cli 2.106.6 (core)",
"@salesforce/lwc-dev-server 2.11.0 (link) /opt/homebrew/lib/node_modules/@salesforce/lwc-dev-server",
"agent 1.24.13 (user) published 2 days ago (Mon Sep 22 2025)",
"apex 3.6.19 (core)",
"api 1.3.3 (core)",
"auth 3.9.4 (core)",
"code-analyzer 5.4.0 (user) published 28 days ago (Tue Aug 26 2025)",
"data 4.0.55 (core)",
"deploy-retrieve 3.23.1 (core)",
"info 3.4.85 (core)",
"lightning-dev 3.5.1 (user) published 27 days ago (Wed Aug 27 2025)",
"limits 3.3.66 (core)",
"marketplace 1.3.8 (core)",
"org 5.9.28 (core)",
"packaging 2.20.1 (core)",
"schema 3.3.81 (core)",
"settings 2.4.46 (core)",
"sobject 1.4.72 (core)",
"telemetry 3.6.55 (core)",
"templates 56.3.63 (core)",
"trust 3.7.113 (core)",
"user 3.6.38 (core)",
"@salesforce/sfdx-plugin-lwc-test 1.2.1 (user) published 354 days ago (Fri Oct 04 2024)",
"sfdmu 4.38.0 (user) published 269 days ago (Sun Dec 29 2024)"
]
}
```