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docs(codex_app_server): document multi-root Kanban writable_roots (#27941)

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Update the Codex app-server runtime guide's Kanban section to reflect
the new behaviour:

  * The sandbox override now adds the board DB directory plus every
    Kanban path the dispatcher pinned (HERMES_KANBAN_WORKSPACES_ROOT,
    HERMES_KANBAN_WORKSPACE, legacy HERMES_KANBAN_ROOT) -- deduplicated,
    DB-dir first.
  * The motivation note now includes the cross-mount artifact-write
    scenario (e.g. ``/media/.../kanban-workspaces/...`` on a separate
    drive) and links to issue #27941 so readers can find the original
    bug report.
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xxxigm 2026-05-18 21:03:19 -07:00 • committed by Teknium
parent e215558ba7
commit 78da7efa20
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website/docs/user-guide/features/codex-app-server-runtime.md
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@ -95,7 +95,7 @@ What also works because the MCP callback exposes them:
- **`kanban_show` / `kanban_list`** — read-only board queries for the worker to check its own context.
- **`kanban_create` / `kanban_unblock` / `kanban_link`** — orchestrator-only operations. Available for orchestrator agents running on the codex runtime that need to dispatch new tasks.
The kanban tools are gated by `HERMES_KANBAN_TASK` env var the dispatcher sets — that var is propagated to the codex subprocess (codex inherits env) and from there to the spawned `hermes-tools` MCP server subprocess. So the tools see the right task id and gate correctly. For Codex app-server workers, Hermes also passes narrow app-server sandbox overrides when `HERMES_KANBAN_TASK` is present: keep `workspace-write` sandboxing, add only the current board directory (derived from `HERMES_KANBAN_DB`) as an extra writable root, and keep network disabled by default. This avoids the brittle `:danger-no-sandbox` workaround while letting `kanban_complete` / `kanban_block` update the board DB.
The kanban tools are gated by `HERMES_KANBAN_TASK` env var the dispatcher sets — that var is propagated to the codex subprocess (codex inherits env) and from there to the spawned `hermes-tools` MCP server subprocess. So the tools see the right task id and gate correctly. For Codex app-server workers, Hermes also passes narrow app-server sandbox overrides when `HERMES_KANBAN_TASK` is present: keep `workspace-write` sandboxing, add the **board DB directory plus every Kanban path the dispatcher pinned** as extra writable roots (`HERMES_KANBAN_WORKSPACES_ROOT`, `HERMES_KANBAN_WORKSPACE`, legacy `HERMES_KANBAN_ROOT` — deduplicated, DB-dir first), and keep network disabled by default. This avoids the brittle `:danger-no-sandbox` workaround while letting `kanban_complete` / `kanban_block` update the board DB **and** letting workers write reports/artifacts under workspace mounts that live outside the DB directory (e.g. `/media/.../kanban-workspaces/...` on a separate drive — [issue #27941](https://github.com/NousResearch/hermes-agent/issues/27941)).
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