feat: add OSC7501 agent reporting by JJLiebig · Pull Request #5172 · herdrdev/herdr

JJLiebig · 2026-10-11T21:05:17Z

Any program in a Herdr pane can now report its own status with the program status protocol (OSC 7501, specification revision 0.4). It is one generic path with no per-agent code.

Behavior

Herdr trusts a valid report as sent, from any program. It is not checked against processes, hooks, or the screen. While a report is in place it takes priority over hooks and detection for that pane. Panes that never report behave as before.
The pane shows the record that needs the most attention: blocked, then working, then a result the user has not seen, then idle. It follows the current report, so a program that finishes, waits, and continues shows working again.
done and error use the existing done-until-seen presentation. They last until the pane is seen, the result is replaced or cleared, or the terminal is reset. Once a shell prompt (OSC 133 A) has left a result behind, the shell's next marked command (OSC 133 C) also ends it.
Only done and error count as finished work. Going from working or blocked to idle, a clear, or the prompt sends no completion notification.
A program with no app that Herdr does not otherwise recognize is shown as program.
pane.get and pane.list return the records as an optional program_status array. The addition is backward compatible, with unknown fallbacks for future states and kinds.

Reports go from the libghostty callback to a bounded per-pane record set in the pane reader, then to the app with one wakeup at a time. A full event queue delays reports but does not drop them or block the PTY.

Vendor

libghostty's own parser is used. The vendored base predates the protocol, so three upstream commits are backported as tracked patch 0008 (ghostty PRs 14479, 14560, 14630). A full vendor update would overlap local patches 0004 and 0007.

One line differs from upstream: an id containing a byte outside the value alphabet is rejected instead of skipped. Upstream skips it, which turns state=clear:id=a?b into a clear of every record. The difference and its removal condition are recorded in vendor/libghostty-vt.patches.md.

Patch 0008 applies after patch 0007, so the maintenance check now takes the patches off newest first.

Validation

New tests at the libghostty wrapper, pane reader, record set, terminal state, app API, and headless server boundaries, plus upstream's Zig tests for the backport (99 of 99).
Hosted CI on this head (c82c6e37): the Linux, macOS, and Windows checks, the Nix flake check, and the Windows ConPTY package all pass.
Locally on native Windows on this head: formatting, clippy, maintenance and vendor patch checks, UI hot-path, integration assets, docs contract, and build pass. The Rust suite is 3,433 passed and 1 failed.
The one local failure is windows_plugin_pane_commands_resolve_from_plugin_root_with_cwd_override. It fails the same way on master on that machine and passes in the hosted Windows job.
Live checks in disposable sessions with a synthetic emitter and with Claude Code 2.1.296. The Claude Code check and the render-scale profile, which was unchanged against base, were run on earlier heads of this branch.

Review:

Greptile and CodeRabbit both reviewed this head with no open findings, and all review threads are resolved.
Before the PR, a deep Review Suite cycle ran and every finding was fixed. The last fix, which forwards a status uncovered by seeing a result to attached clients, was reviewed and validated by the coordinator rather than by a further automated round, because the cycle's round budget was exhausted. That cycle's launcher therefore has no recorded clean closure.

Limits

Once a prompt has left an unseen result behind, any next marked command dismisses it, including one started by background automation.
A shell that marks commands but not prompts leaves nothing behind, so a command start there dismisses nothing.
In shells without OSC 133 marks, explicit state stays until it is seen, replaced, cleared, or reset. An unseen result left there keeps the pane's status even while Herdr detects another agent in the pane.
A program that reports working and then stops without done or error leaves the pane idle without a notification.
Records are not persisted and are not in client snapshots. A change to records alone emits no API event, and intermediate reports that are superseded before delivery are not announced.

kangal-bot · 2026-10-11T21:05:26Z

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coderabbitai · 2026-10-11T21:05:27Z

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📒 Files selected for processing (9)

AGENTS.md
docs/next/website/src/content/docs/add-herdr-support.mdx
docs/next/website/src/content/docs/ja/add-herdr-support.mdx
docs/next/website/src/content/docs/zh-cn/add-herdr-support.mdx
scripts/test_vendor_libghostty_vt.py
src/api/server.rs
src/pane/terminal.rs
src/server/headless/tests/mod.rs
vendor/libghostty-vt.patches.md

🚧 Files skipped from review as they are similar to previous changes (1)

vendor/libghostty-vt.patches.md

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📝 Walkthrough

Walkthrough

This change adds OSC 7501 parsing and terminal callbacks for program status, semantic prompt events, and full resets. PTY processing carries status events through per-pane mailboxes into terminal and pane state. The API exposes program-status records in pane responses, with schemas and documentation updated. Result visibility, acknowledgement, rendering, and client notifications now account for reported results.

Suggested reviewers: ogulcancelik

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to c82c6

The documentation now preserves the guidance needed to keep completed results visible. No actionable merge-blocking risk remains after normal checks.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 48.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 120 functions across 28 files. (5 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly and concisely identifies the main change: adding OSC 7501 agent reporting.
Description check		The description is directly related to the changeset and explains OSC 7501 reporting, behavior, API changes, vendor updates, validation, and known limits.

Full details: Docstring Coverage

Explanation

Docstring coverage is 48.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 120 functions across 28 files. (5 skipped: 5 unsupported.)

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coderabbitai · 2026-10-11T21:05:33Z

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greptile-apps · 2026-10-11T21:11:33Z

Confidence Score: 5/5

[Critical impact] The PR appears safe to merge; no new blocking issue remains.

Summary

Adds OSC 7501 reports through libghostty, bounded per-pane records, pane status selection, completion notifications, and optional API records.

Programs can report their status from any Herdr pane.
Pane queries now include the program’s reported status records.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  P[Program writes OSC 7501] --> G[libghostty checks report]
  G --> R[PTY reader updates bounded records]
  R --> M[One pending mailbox wakeup]
  M --> A[App selects pane status]
  A --> N[Notifications and client updates]
  A --> API[Optional program_status API array]
  S[User sees result] --> A
  B[Prompt, clear, or reset] --> R

_{Reviews (2) · Last reviewed commit: "feat: add OSC7501 agent reporting" · Reviewed by Greptile}

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Inline comments:
Review comments at @docs/next/website/src/content/docs/add-herdr-support.mdx:
- Line 114: Update the exit guidance in
docs/next/website/src/content/docs/add-herdr-support.mdx at line 114 to
recommend sending state=clear only when the program exits without a final done
or error report, and clarify that clear also removes reported results. Apply the
same change to docs/next/website/src/content/docs/ja/add-herdr-support.mdx at
line 114 and docs/next/website/src/content/docs/zh-cn/add-herdr-support.mdx at
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📥 Commits

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📒 Files selected for processing (46)

crates/ghostty-vt/src/bindings.rs
crates/ghostty-vt/src/lib.rs
docs/next/api/herdr-api.schema.json
docs/next/website/src/content/docs/add-herdr-support.mdx
docs/next/website/src/content/docs/ja/add-herdr-support.mdx
docs/next/website/src/content/docs/ja/socket-api.mdx
docs/next/website/src/content/docs/socket-api.mdx
docs/next/website/src/content/docs/zh-cn/add-herdr-support.mdx
docs/next/website/src/content/docs/zh-cn/socket-api.mdx
src/api/schema/panes.rs
src/api/schema/tests.rs
src/api/server/subscription_socket_tests.rs
src/api/subscriptions.rs
src/app/actions.rs
src/app/api.rs
src/app/api/panes.rs
src/app/creation.rs
src/app/mod.rs
src/app/runtime.rs
src/app/state.rs
src/client/shell/tests/mod.rs
src/events.rs
src/pane.rs
src/pane/terminal.rs
src/server/headless.rs
src/server/headless/notifications.rs
src/server/headless/tests/mod.rs
src/server/render_scale_benchmark.rs
src/terminal/mod.rs
src/terminal/program_status.rs
src/terminal/state.rs
vendor/libghostty-vt.patches.md
vendor/libghostty-vt/include/ghostty/vt/osc.h
vendor/libghostty-vt/include/ghostty/vt/terminal.h
vendor/libghostty-vt/src/lib_vt.zig
vendor/libghostty-vt/src/terminal/c/terminal.zig
vendor/libghostty-vt/src/terminal/c/types.zig
vendor/libghostty-vt/src/terminal/main.zig
vendor/libghostty-vt/src/terminal/osc.zig
vendor/libghostty-vt/src/terminal/osc/parsers.zig
vendor/libghostty-vt/src/terminal/osc/parsers/program_status.zig
vendor/libghostty-vt/src/terminal/stream.zig
vendor/libghostty-vt/src/terminal/stream_terminal.zig
vendor/libghostty-vt/src/termio/stream_handler.zig
vendor/patches/libghostty-vt/0007-experimental-png-retention.patch
vendor/patches/libghostty-vt/0008-backport-program-status-protocol.patch

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JJLiebig · 2026-10-11T21:40:08Z

@greptileai review

@coderabbitai review

Please review the latest head c82c6e3. It is rebased onto current master and folds in the fixes for the Unix-only test fixture, the vendor patch order, and the state=clear guidance.

coderabbitai · 2026-10-11T21:40:15Z

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greptile-apps Bot reviewed Oct 11, 2026

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feat: add OSC7501 agent reporting

c82c6e3

JJLiebig force-pushed the osc7501 branch from 5eadffd to c82c6e3 Compare October 11, 2026 21:35

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feat: add OSC7501 agent reporting - #5172

feat: add OSC7501 agent reporting#5172
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