# Configuring Textual settings for A2A

On a self-hosted instance of Tonic Textual, to configure how A2A calls to your instance work, use the following [environment variables](/textual/textual-install-administer/configuring-textual/textual-env-var-configure.md):

<table><thead><tr><th width="323.73828125" valign="top">Variable</th><th width="123.953125" valign="top">Default value</th><th valign="top">Description</th></tr></thead><tbody><tr><td valign="top"><code>SOLAR_API_URL</code></td><td valign="top"></td><td valign="top"><p>Public origin of the API (<code>https://textual.example.com</code>).</p><p></p><p>Published in the agent card as the absolute interface URL.</p><p></p><p>Must be reachable by clients.</p></td></tr><tr><td valign="top"><code>SOLAR_A2A_PROTOCOL_MODE</code></td><td valign="top"><code>both</code></td><td valign="top"><p>The allowed A2A protocol. Allowed values are:</p><p></p><ul><li><code>both</code> - Accepts v0.3 and v1 clients on the same endpoint.</li><li><code>v1_only</code> - Rejects v0.3.</li><li><code>v03_only</code> - Rejects v1.</li></ul></td></tr><tr><td valign="top"><code>SOLAR_A2A_MAX_TEXT_LENGTH</code></td><td valign="top"><code>500000</code></td><td valign="top"><p>The maximum number of characters in a string sent for detection or redaction.</p><p></p><p>When set to <code>0</code> , the text detection and redaction skills are disabled.</p></td></tr><tr><td valign="top"><code>SOLAR_A2A_MAX_FILE_SIZE_MB</code></td><td valign="top"><code>100</code></td><td valign="top"><p>The maximum size in megabytes of a file sent for redaction.</p><p></p><p>When set to <code>0</code> , the file redaction skill is disabled.</p></td></tr><tr><td valign="top"><code>SOLAR_A2A_MAX_CONCURRENT_TASKS_PER_ORG</code></td><td valign="top"><code>5</code></td><td valign="top"><p>The number of active A2A tasks that are allowed for each organization.</p><p></p><p>When set to <code>0</code> , the A2A agent is disabled.</p></td></tr><tr><td valign="top"><code>SOLAR_A2A_JOB_TIMEOUT_IN_MINUTES</code></td><td valign="top"><code>30</code></td><td valign="top">The number of minutes before a <code>file-redact</code> job times out and is marked as failed.</td></tr><tr><td valign="top"><code>SOLAR_A2A_TASK_TTL_HOURS</code></td><td valign="top"><code>72</code></td><td valign="top"><p>The number of hours to retain completed, failed, and canceled tasks.</p><p></p><p>When set to <code>0</code> , the tasks are not purged.</p></td></tr></tbody></table>


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