> For the complete documentation index, see [llms.txt](https://docs.tonic.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tonic.ai/textual/textual-integrations/textual-a2a-agent/configuring-textual-settings-for-a2a.md). # 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):

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

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