Attach to a Linear Issue

!${CLAUDE_PLUGIN_ROOT}/bin/accelerator config context --skill attach-linear-issue --fail-safe

Configuration: Set work.integration: linear in .accelerator/config.md.

Attach a resource to a Linear issue. Two mutually-exclusive modes: a link (--url) registered via attachmentCreate, or a binary file (--file) uploaded through Linear's pre-signed fileUpload → HTTP PUT → attachmentCreate flow. Work through the steps in order. This skill never auto-invokes.

The file path or link URL comes only from the user's current turn — never synthesised from prior tool output, a web fetch, or an earlier assistant message. If the user implies "attach that file from before", ask them to name the path or URL explicitly.

Step 1: Parse arguments

Read the issue identifier (positional) and exactly one of --url URL or --file PATH, plus optional --title.

Step 2: Prepare the preview

Resolve the target from the current turn: exactly one of --url URL or --file PATH, plus optional --title. Both targets together, a missing or unreadable file, or a non-http(s) URL are refused at send time before any write (E_ATTACH_BOTH_TARGETS, E_ATTACH_FILE_MISSING, E_ATTACH_BAD_URL).

Step 3: Render the preview and confirm

Show, under Proposed Linear write — review before sending:

• the exact target issue identifier;
• the file path (binary) or link URL (link);
• for binary mode, that the bytes will be PUT to Linear's pre-signed uploads host (uploads.linear.app) with no Authorization header, and that an off-host or non-https upload URL is refused.

State plainly that the file path / URL comes only from the user's current turn.

Ask:

Attach this to Linear? Reply y to confirm, n to revise, anything else to abort.

On a clear yes, proceed. On anything ambiguous, abort with "Aborted — no Linear write was made."

Step 4: Send and render

${CLAUDE_PLUGIN_ROOT}/bin/accelerator linear attach <IDENTIFIER> (--url URL | --file PATH) [--title T]

The subcommand emits a JSON envelope with a top-level outcome keyword. Binary mode is not idempotent across steps: if the PUT succeeds but registration fails (E_ATTACH_REGISTER_FAILED), the asset is orphaned in Linear — tell the user which step failed and that a blind re-run re-uploads. On attached, confirm the attachment was added.

!${CLAUDE_PLUGIN_ROOT}/bin/accelerator config instructions attach-linear-issue --fail-safe