The kanban board has had full attachment storage and a dashboard HTTP
API (upload/list/download/delete) since #35338, but there was no agent
toolset tool and no `hermes kanban` CLI verb for attachments. Agents and
scripts that don't go through the dashboard server (or can't touch the DB
directly) had no way to create or read real attachments — only links in
comments.
Close that gap by mirroring the existing comment surface:
- `kanban_db.store_attachment_bytes()` — one shared write path (validate
name, enforce the 25 MB cap, write the blob under the per-task dir with
collision-free naming, insert the metadata row, clean up an orphan blob
if the insert fails). `_MAX_ATTACHMENT_BYTES`, `_safe_attachment_name`,
and a new `_collision_free_path` move here so the dashboard, the tool,
and the CLI all share one implementation and can't drift.
- Tools (`tools/kanban_tools.py`): `kanban_attach` (inline base64),
`kanban_attach_url` (server-side http/https fetch with the same cap),
`kanban_attachments` (list). Write tools respect worker task-ownership;
list is read-only. Registered in the `kanban` toolset.
- CLI (`hermes_cli/kanban.py`): `attach <id> <path>`, `attachments <id>`,
`attach-rm <attachment_id>`.
- Dashboard `upload_task_attachment` now imports the shared helpers and
uses `_collision_free_path` — behavior identical (still streams to disk
with the cap, still 413 on overflow).
- Docs (AGENTS.md, kanban-worker skill) and toolset membership updated.
Tests: tool round-trip + oversize + bad base64 + ownership; attach_url
against a local HTTP fixture incl. oversize-mid-stream and non-http
scheme rejection; CLI attach/attachments/attach-rm; shared-helper unit
tests; dashboard parity preserved.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Tasks can now carry file attachments (PDFs, images, source docs) that
workers read directly — closes the gap where source material had to be
pasted as a path into the task body.
- kanban_db: task_attachments table (additive), Attachment dataclass,
add/list/get/delete accessors, attachments_root/task_attachments_dir
path helpers (per-board, HERMES_KANBAN_ATTACHMENTS_ROOT override)
- build_worker_context: surfaces each attachment's absolute path so the
worker (full file/terminal tool access) reads it via read_file/pdftotext
- dashboard API: POST/GET/DELETE attachment routes (multipart upload,
25MB cap, traversal-safe filenames, root-containment check on download)
- dashboard UI: Attachments section in the task drawer — upload button,
list with download, per-row remove
- docs + tests (13 cases: DB accessors, REST round-trip, traversal
rejection, collision suffixing, worker-context surfacing)
Closes#35338
