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fix(cli,sdk,broker): send and receive file attachments (screenshots) over DMs and channels - #1945
Conversation
…osts; download attachments
agent-relay message file upload serialized {type:'file',path} as the attachment id, so the
server rejected every upload with 'Invalid attachments: file ids must exist in workspace and be
complete' and no bytes were ever stored (#1398).
- SDK: files.upload/get/download on AgentRelay and RelaycastMessagingClient, and shared
uploadRelayFile/downloadRelayFile helpers (request upload, PUT bytes, complete).
- CLI: --file on message dm send, message post and message dm send_group; message file upload
takes --channel or --to; new message file get and message file download.
- MCP: upload_file and download_file tools; send_group_dm accepts attachments.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
* fix(broker): verify PTY turn submission * style: auto-format with Prettier * docs: clarify PTY human ownership * fix(broker): serialize PTY acceptance recovery * fix: harden PTY acceptance recovery * fix: dedupe delivery stuck transitions * fix: distinguish drafts from PTY activity * fix(broker): harden delivery acceptance edges * fix(broker): close harness recovery edge cases * fix(broker): remove dead wrap lifetime reset * fix(broker): normalize Gemini composer borders * fix(broker): confirm Codex composer receipt across reflow * fix(broker): recognize native Codex idle placeholder after recovery --------- Co-authored-by: kjgbot <kjgbot@agentrelay.dev> Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Co-authored-by: Miya <khaliqgant+miya@gmail.com> Co-authored-by: Khaliq <khaliq@agentrelay.com>
Inbound attachments were deserialized and dropped, so agents only saw
message text. The broker now carries attachments through the typed wire
parser, tolerant fallback, and node delivery payloads; downloads each
file best-effort (25 MiB cap, 20s per file, 60s per message) via
GET /v1/files/{id} and its download_url into
<agent cwd>/.agent-relay/attachments/<file_id>/<filename> (home fallback);
and appends an "Attachments:" block after the message body with the saved
path, or the file id plus an `agent-relay message file download` command
when not downloaded. Node deliveries with attachments are held off the
event loop until their downloads finish, preserving per-agent order.
Attachment-only messages are injected instead of the raw payload JSON.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Session-Id: 12457d35-c3d7-44f9-9717-84911b5f957b
…ttachments # Conflicts: # CHANGELOG.md
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Session-Id: 12457d35-c3d7-44f9-9717-84911b5f957b
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📝 Walkthrough
Merge Risk: ⚪ Minimal · up to Attachment downloads and delivery ordering are bounded by timeouts, and stalled downloads fall back to a fetch reference rather than blocking later messages. No actionable merge-blocking risk was found in the reviewed attachment staging changes. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Out of Scope Changes check |  |
The attachment flow supports issue #1398. The PR also changes PTY delivery verification and recovery, protocol events, harness detection, snapshots, relay-flow cases, and PTY documentation. These chan… |
Remove the unrelated PTY delivery verification, recovery, protocol, detection, snapshot, relay-flow, and documentation changes from this pull request, or move them to a separate pull request with a linked issue. |
| Docstring Coverage | |
Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 297 functions across 42 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (3 passed)
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Check name Status Explanation Title check The title clearly summarizes the primary change: file attachment support across the CLI, SDK, and broker for DMs and channels. Description check The description provides a detailed summary, implementation scope, test results, end-to-end validation, and linked issue context. It does not use the template's exact Test Plan or RelayFlow Proof sect… Linked Issues check Issue #1398requires a request for an upload URL, a byte PUT, completion, and a completed file ID in the message. The PR addsuploadRelayFile, uses it inmessage file upload, and defaults missing …
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Full details: Out of Scope Changes check
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Explanation
The attachment flow supports issue
#1398. The PR also changes PTY delivery verification and recovery, protocol events, harness detection, snapshots, relay-flow cases, and PTY documentation. These changes do not implement file upload or attachment delivery for issue#1398.
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A rabbit uploads a bright file with care,
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The broker sends notes in a tidy line,
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…URLs, capped SDK downloads, strict base64 - Broker: the saved path is shown exactly (never truncated or rewritten); sanitized file names map brackets to parentheses; a path that can't sit on one line falls back to the fetch command. - Broker: a previous download is reused only when its size is known and matches. - Broker: the signed download URL is fetched without the workspace key, so no redirect can carry the credential elsewhere. - SDK: downloadRelayFile streams with a 25 MiB cap (maxBytes option). - MCP upload_file rejects malformed content_base64 instead of uploading different bytes. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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- Broker: refuse a symlinked <root>/<file_id> directory and never reuse a symlinked file; a read-only attachments root now fails the write probe so the fallback root is used; file names are made Windows-safe (<>:"|?* replaced, trailing dots/spaces trimmed, reserved device names prefixed). - CLI: check every --file path first, then read and upload one at a time (bounded memory); recheck the size of the bytes actually read; saveAttachment refuses data over 25 MiB; Windows-safe download names; strict base64 rejects oversized input by encoded length before decoding. - SDK: a file record without status but with a download URL is treated as complete. - Tests: exact attachment bytes in the broker runtime test, the PUT body in the MCP base64 test, new lib/attachments tests. Changelog bullets made impact-first. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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…zes, safer saves - Broker: at most 2 messages download attachments at once (later ones stay held, unacked); a body whose length differs from the file record is discarded, not announced as saved; an existing attachments .gitignore gains the catch-all rule. - SDK: downloadRelayFile rejects a non-finite or negative maxBytes and a body whose byte count differs from the record. - CLI: file upload --to resolves the recipient and prints the same delivery receipt as dm send, exiting non-zero when it can't be verified; downloads into a directory never replace an existing file (they pick name (n).ext). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @CHANGELOG.md:
- Line 92: Move the broker-managed PTY bullet from the released [13.1.1] section
to the Fixed subsection under [Unreleased - Minor], and remove its
planned-rollout sentence. Keep the remaining description of PTY delivery and
recovery behavior intact.
Review comments at @crates/broker/src/runtime/worker_events.rs:
- Around line 1069-1090: In the delivery_failed handler, use
pending_delivery_count to keep the worker in BlockedOnSend and emit
AgentBlockedOnSend and the stuck transition only when the count is greater than
zero; otherwise leave it unblocked. In the related remains_blocked check, also
require that the worker still has pending deliveries so idle handling can clear
its state and publish the idle transition.
Review comments at @packages/cli/src/cli/lib/attachments.ts:
- Around line 123-127: Update the default-path branch in saveAttachment to avoid
overwriting existing files or following planted symlinks: create the attachment
directory, then use exclusive file creation and the same numbered-name collision
handling as the directory branch. Return the path actually created.
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📒 Files selected for processing (49)
.agents/skills/using-agent-relay/SKILL.md.claude/skills/using-agent-relay/SKILL.mdCHANGELOG.mdcrates/broker/src/attachments.rscrates/broker/src/broker/delivery_verification.rscrates/broker/src/conversation_log.rscrates/broker/src/lib.rscrates/broker/src/protocol.rscrates/broker/src/pty_worker.rscrates/broker/src/relaycast/auth.rscrates/broker/src/relaycast/bridge.rscrates/broker/src/relaycast/wire.rscrates/broker/src/runtime/delivery.rscrates/broker/src/runtime/event_loop.rscrates/broker/src/runtime/fleet.rscrates/broker/src/runtime/init.rscrates/broker/src/runtime/tests.rscrates/broker/src/runtime/worker_events.rscrates/broker/src/types.rscrates/broker/src/wrap.rscrates/relay-pty/src/detection.rscrates/relay-pty/src/snapshot.rsdocs/harnesses/devin.mddocs/harnesses/pty-delivery.mdpackages/cli/README.mdpackages/cli/src/cli/commands/message-files.test.tspackages/cli/src/cli/commands/message.tspackages/cli/src/cli/lib/attachments.test.tspackages/cli/src/cli/lib/attachments.tspackages/cli/src/cli/mcp/messaging-tools.files.test.tspackages/cli/src/cli/mcp/messaging-tools.tspackages/contracts/fixtures/event-fixtures.jsonpackages/harness-driver/src/lifecycle-hooks.tspackages/harness-driver/src/protocol.tspackages/sdk-py/src/agent_relay/protocol.pypackages/sdk-swift/Sources/AgentRelayBrokerSDK/BrokerTypes.swiftpackages/sdk/package.jsonpackages/sdk/src/__tests__/files.test.tspackages/sdk/src/agent-relay.tspackages/sdk/src/messaging/files.tspackages/sdk/src/messaging/index.tspackages/sdk/src/messaging/normalize.tspackages/sdk/src/messaging/relaycast-client.tspackages/sdk/src/messaging/relaycast.tspackages/sdk/src/messaging/thin-client.tspackages/sdk/src/messaging/types.tstests/relayflows/cases/1891-codex-parked-composer-recovery/case.jsontests/relayflows/cases/1891-codex-parked-composer-recovery/real-codex.mjstests/relayflows/cases/1891-codex-parked-composer-recovery/run.mjs
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…chments # Conflicts: # AGENTS.md Session-Id: 01a121a8-a799-74f1-b131-a5b10c7cb35b
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1 issue found and verified against the latest diff
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Prompt for AI agents (unresolved issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="crates/broker/src/wrap.rs">
<violation number="1" location="crates/broker/src/wrap.rs:2385">
P2: For Devin, `can_inject` is false while the delivery is parked in the composer, so this recovery branch falls through and reports terminal failure instead of submitting or deferring the delivery. Handle the parked-but-not-ready case without dropping it.</violation>
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/cli/src/cli/lib/attachments.ts:
- Around line 124-125: Update the default destination handling around
safeAttachmentFilename and mkdir to create and open .agent-relay/attachments
without following symlinks, including when an existing path component is a
symlink. Use operations that prevent symlink replacement between validation and
writing, and fail rather than writing into a symlink target.
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CHANGELOG.mdcrates/broker/src/runtime/tests.rscrates/broker/src/runtime/worker_events.rspackages/cli/src/cli/lib/attachments.test.tspackages/cli/src/cli/lib/attachments.ts
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Actionable comments posted: 4
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @crates/broker/src/attachments.rs:
- Around line 716-718: Replace both `tokio::fs::write` calls for `.gitignore`
with operations that open the existing file without following symlinks, or
create a missing file exclusively. Perform the content check and write through
the opened file so they remain tied to the same file rather than re-resolving
the path.
Review comments at @crates/broker/src/broker/delivery_verification.rs:
- Around line 915-926: Update assess_harness_acceptance so detectors without
explicit patterns accept delivery when the message echo was seen and the body is
no longer parked; preserve Inconclusive while the body remains parked. Update
this test’s expected acceptance to match that behavior.
Review comments at @crates/broker/src/runtime/worker_events.rs:
- Around line 954-958: Update the PTY verification gate near the is_pty check to
accept both "harness_acceptance" and "completed_replay" as valid verification
values. Preserve the existing rejection behavior for other PTY verification
values.
Review comments at @packages/sdk/src/messaging/files.ts:
- Around line 33-34: Keep the timeout and abort listener active through body
consumption in fetchFileBytes and downloadRelayFile, cleaning them up only when
the download completes or fails. Preserve the existing separate handling for
fetch failures and non-2xx responses, and add a test where headers arrive but
reading the response body stalls.
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📒 Files selected for processing (19)
crates/broker/src/attachments.rscrates/broker/src/broker/delivery_verification.rscrates/broker/src/pty_worker.rscrates/broker/src/runtime/fleet.rscrates/broker/src/runtime/tests.rscrates/broker/src/runtime/worker_events.rscrates/broker/src/wrap.rscrates/relay-pty/src/detection.rspackages/cli/src/cli/commands/message.tspackages/cli/src/cli/lib/attachments.test.tspackages/cli/src/cli/lib/attachments.tspackages/cli/src/cli/mcp/messaging-tools.files.test.tspackages/cli/src/cli/mcp/messaging-tools.tspackages/sdk/src/__tests__/files.test.tspackages/sdk/src/facade.tspackages/sdk/src/messaging/files.tspackages/sdk/src/messaging/relaycast.tspackages/sdk/src/messaging/types.tstests/relayflows/cases/1891-codex-parked-composer-recovery/real-codex.mjs
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- crates/broker/src/runtime/fleet.rs
- packages/cli/src/cli/commands/message.ts
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Approved for Khaliq: fully green on 8f32137 (84 checks passing, fresh CodeQL with 0 open alerts, every review bot finished, 0 unresolved threads, no open High/Major). Remaining P2/P3 were fixed or answered in their threads. Live proofs: Mac<->Linux by DM and channel, plus automatic local-path saves on the receiver.
Brings in #1945 (harness-acceptance PTY delivery, submit-key resubmits, file attachments) and resolves its overlap with the bundle. Delivery verification: #1945's acceptance model replaces #1893's echo verdict ladder for message delivery in pty_worker and wrap. A body echoed in the composer can still be a parked draft, so echo content no longer confirms anything; EchoVerdict, verification_timeout, the head-missing check and wrap's echo-timeout re-injection are dropped with their tests, and the integrity test fixture modes that only exercised echo verdicts (tail, middle_lost, paste_tail, silent) go with them. Bracketed paste, the 16 KiB cap, the wrap pointer for oversized messages, --task-file and the Devin trust gate are kept. Verified fleet spawn confirmation (#1893) keeps its frame-order handling and spawn_task_unconfirmed result, re-pointed at #1945's labels: - verification_label_confirms_receipt accepts only "harness_acceptance". Legacy "echo"/"timeout_fallback", "completed_replay" and an unlabelled frame resolve the spawn as spawn_task_unconfirmed. The spawn verdict is recorded before the PTY gate that turns non-acceptance labels into delivery_unconfirmed, so the action still resolves. - A delivery_failed with "harness acceptance could not be proven" (window closed, body neither accepted nor parked) is not evidence of loss, so the spawn resolves as spawn_task_unconfirmed and keeps the live worker, instead of releasing it as spawn_task_failed. Every other failure reason, including "body remained parked after bounded submit-key recovery", still releases the worker and fails with spawn_task_failed. - The label and reason are shared constants (HARNESS_ACCEPTANCE, HARNESS_ACCEPTANCE_UNPROVEN) used by pty_worker and the runtime. MCP: send_dm uses the shared idempotencyKeyInput and replayScopeOf with #1945's upload_file attachment wording. AGENTS.md follows main (trunk gating removed). CHANGELOG unions both Unreleased sections. Protocol docs and docs/harnesses/injection.md describe the acceptance labels and reasons. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
…-submission #1945 carried the original #1891 PTY delivery change into main without the #1954/#1955 fixes. Resolved against the #1891 pre-image (origin/trunk, same content as d153837 for these files) so only #1945's own edits conflicted. Kept from #1945: file attachments (wrap-mode attachment references, attachment echo test), CRLF-normalized echo matching, word-boundary "working" busy detection, the delivery_unconfirmed SDK event for rejected delivery_verified frames, and the completed_replay non-confirmation guard. Superseded (orchestrator decision): #1945's M4 variant (event-loop delayed CR follow-up plus refusing human write_pty with pty_write_queue_full during recovery) in favour of #1954's drainer-level cancellation, which never refuses operator keystrokes. #1945's generic echo_left_composer acceptance is replaced by #1954's guarded rule (post-echo output, body not at/after the cursor); attachment deliveries do not depend on the shortcut (confirmed by #1945's author) and are covered by a new test. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Session-Id: a4d98f2e-cd4b-47a9-87f8-1deb0f44eb41
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Summary
Agents and people can send screenshots and other files by DM and on channels, and a recipient PTY agent gets a local path it can open. Fixes #1398.
Root cause (#1398)
agent-relay message file uploadpassed[{type:'file', path}], andserializeAttachmentInputsJSON-stringified it into the attachment id. No bytes were ever uploaded, so every call failed withInvalid attachments: file ids must exist in workspace and be complete. Reproduced on CLI 13.1.1 andnpx agent-relay@13.2.0.message dm sendalso had no way to attach a file, and the broker droppedattachmentsfrom inbound events.Changes
files.upload/get/downloadonAgentRelayandRelaycastMessagingClient.uploadRelayFile/downloadRelayFilehelpers: request the upload, PUT the bytes, then complete. A failed PUT never completes, and the signed URL query never appears in errors.--file <path>onmessage dm send,message postandmessage dm send_group.message file upload <path> --channel <ch> | --to <agent>; text defaults to the file name.message file get <id>.message file download <id> [--out], which saves to.agent-relay/attachments/<id>/<name>by default and prints the path.agent-relay mcp):upload_file(local path or base64) anddownload_file;send_group_dmacceptsattachments.<worker cwd>/.agent-relay/attachments/<file_id>/<name>. That directory gets a.gitignoreof*.file <id> (not downloaded: <reason>); fetch with: agent-relay message file download <id>.Companion PRs:
/sendwith files to DMs and channels.Tests: red, then green
packages/cli/src/cli/commands/message-files.test.ts(new): 8/8 failed against the originalmessage.ts, 8/8 pass with this change.packages/sdk/src/__tests__/files.test.ts(new): 7/7 pass.packages/cli/src/cli/mcp/messaging-tools.files.test.ts(new): 4/4 pass.relaycast-groupsandmessaging-tools.protocolsuites still pass: 90/90 across the CLI and MCP files.fleet_delivery_with_attachment_injects_attachment_referenceanddm_with_attachments_injects_attachment_referencefailed on base with the body"see screenshot".cargo test -p agent-relay-broker --no-fail-faston the merged branch: lib 1431 passed / 0 failed; continuity 12, fleet_wire_fixtures 2, journal_lock_cli 3, muse_startup_cli 2 all pass. Run withenv -u RELAY_INJECT_RATE_MS -u GIT_CONFIG_* -u RELAY_ATTEST_*and/usr/sbinon PATH.cargo fmt --checkandcargo clippy -- -D warnings(the CI form): pass.packages/clitsc --noEmit: pass.npm run lint: 0 errors.Local end-to-end proof
Local end-to-end proof (self-hosted engine from this relaycast branch + agent-relay CLI from the relay branch)
The receiving Claude session opened the downloaded PNG with Read and saw the test image (red square, blue circle, green stripe, noise band).
RELEASE NEEDED: the CLI, MCP and broker changes reach users only in a new agent-relay release. Releases are not cut from this PR.
Live cross-machine proof: all four Mac↔Linux directions pass. DM and channel attachments crossed Mac→Linux byte-identically (
3eeedee2…,b84b11b6…); Linux→Mac DM and channel files were downloaded, SHA-1 verified and opened (3850791d…,353b2e30…). The final channel proof used relay-desktop#361POST /sendwithchannel+files(message234368095965777920, file234368083952877568, 34,900 bytes). relaycast-cloud #220 is merged and its production upload/download path was verified.Main-target review follow-up
delivery_failednow clearsBlockedOnSendwhen it removes the final pending delivery for a worker; blocked/stuck events are emitted only while another delivery remains. Idle, stream, and delivery activity also preserve blocking only while pending work exists.[Unreleased - Minor]/Fixed, with the release-only rollout sentence removed.BlockedOnSendinstead ofWorking/Idle; CLI attachment helpers failed 2/5 because repeat and symlink targets were overwritten.cargo clippy -p agent-relay-broker -- -D warnings,cargo fmt --check, CLI TypeScript, ESLint, Prettier, andgit diff --checkpass.Agent Relay sessions
🤖 Generated with Claude Code
Note
High Risk
Changes broker message injection, on-disk file handling, and when fleet deliveries are ACKed—security-sensitive paths (signed URLs, path sanitization) plus behavior that can block or duplicate delivery if acceptance logic is wrong.
Overview
Adds end-to-end file attachments for Relaycast messages and hardens how the broker delivers them into PTY agents.
Inbound WS and fleet
deliverframes now parse attachment metadata and append anAttachments:block to the injected body. For fleet/node delivery, the broker downloads files (caps, timeouts, bounded concurrency) into.agent-relay/attachments/<file_id>/, stages deliveries per agent until downloads finish, and supports attachment-only messages. Failed or oversized downloads still inject fetch hints (agent-relay message file download <id>) with sanitized filenames and injection-safe rendering.PTY delivery confirmation moves beyond raw echo: verification allows up to three submit-only retries, tracks composer “parked” vs accepted state (Codex, Claude, Gemini, Devin,
cat), and emits richerDeliveryVerified/DeliveryUnconfirmed/DeliveryResubmittedevents. Supporting changes include cursor-bounded PTY snapshots and Codex-specific busy-line activity detection. Docs/skills/changelog document CLI--file, file upload/download, and MCPupload_file/download_file(SDK/CLI implementation referenced in changelog; not all paths appear in this diff slice).Reviewed by Cursor Bugbot for commit 8f32137. Bugbot is set up for automated code reviews on this repo. Configure here.
Agent Relay sessions
claudesession12457d35· opened viagh pr create· last active 2026-10-09