skip to content
Replays

A Menu System for Gantry's Run Monitor

Rebuilding the terminal front-end around an action registry, a shared file viewer, clipboard copy, and live run statistics.

Gantry milestones

4 milestones 18 sprints 42 agents

243k peak context

162k median execute

A seven-menu TUI redesign with a pager and live statistics.

6h 12m total 15m 51s per sprint

20m 47s plan 4h 34m execute 35m 22s review

321 edits 1.4k commands

claude harness

213.3M tokens in 1.2M tokens out

$189.31 nominal cost

Gantry's run monitor had accumulated useful actions without a single place to discover or invoke them. This job rebuilt that surface around a registry-backed menu bar, a shared read-only pager, clipboard actions, live statistics, run controls, agent inspection, and demo coverage. The current tree has since compressed the public bar into fewer titles, but the main mechanisms from the job remain: registry dispatch, generated help, stateful View controls, Inspect readers, assistant actions, stats, ticker formatting, and the tests that pin the behavior.

How this walkthrough is structured

Feature

What did the run build and ship?

The monitor still uses the registry, pager, clipboard path, statistics fold, ticker, and inspection menus from this job, while later work renamed and compressed several of the original bar titles.

Build

How did Gantry structure the work?

The run split the monitor redesign into dependency-ordered menu infrastructure, shared viewers, live run state, and cross-cutting display work, with re-planning isolated to the shared pager and metadata milestone.

Milestone 1

Registry and Menu Bar

4 sprints 0 agents 1h 17m wall time 200k peak context $40.52 nominal cost

The registry and rebuilt menu machinery still live in the TUI module, although the visible bar no longer carries the full original title set. The current code pins a shorter build-run bar and a reduced chat-only bar, while still deriving menu items from registered actions and live application state. View and help behavior also survive, though some help and application-level entries now sit under the Gantry title.

This milestone carried the foundation every later menu would depend on: one action registry, a rebuilt bar, and the first complete menus. Its scope was large but internally ordered, so each sprint could take one layer of the input surface without needing the whole redesign in memory. The run facts show this milestone stayed green, which fits a cut that kept visible features behind a registry and rebuild contract before downstream menus leaned on it.

Action Registry and Dispatch

0 agents 13m 33s wall time 150k peak context 47.3k tokens out $7.20 nominal cost

The action ids and registry helpers remain part of the monitor's input layer. Tests near the current menu code still assert that registered actions, menu items, help rows, and key dispatch stay coherent. The visible menus have changed names since this sprint, but the single registry contract is still the source behind those surfaces.

This sprint was asked to collapse keys, menu item ids, and help text onto the same action registry before changing the bar's shape. That made the job small enough for a fresh agent: preserve existing keys, route them through one dispatcher, and prove help generation from the same registry. Its boundary stayed clean, with no repair or retry recorded.

Menu Bar Foundation

0 agents 15m 24s wall time 148k peak context 45.4k tokens out $6.78 nominal cost

The present monitor still rebuilds its menu from application state, and tests still assert that changed state does not close an unrelated dropdown. The original many-title bar was later consolidated into Gantry, View, Stats, and Inspect for normal runs. That means the skeleton's exact titles have not survived, while the state-driven rebuild behavior has.

This piece turned the registry into a live bar and established the per-frame rebuild behavior the later dynamic items needed. The agent did not have to implement the whole menu catalogue; it only had to render the title skeleton, rebuild from state, and keep an open dropdown stable across rebuilds. The run stayed green at that boundary.

View Menu Implementation

0 agents 20m 33s wall time 187k peak context 64.7k tokens out $10.06 nominal cost

The View menu remains an active surface in the current bar. Current tests still cover feed filtering, recent navigation under View, pane focus and sizing controls, and state-sensitive menu rebuilds. Some later behavior was added to View, but the sprint's core pattern, checked menu state backed by application state, is still visible.

This sprint was a bounded stateful-menu exercise: move feed navigation, sidebar visibility, chat focus, filters, card expansion, and zoom under View. The brief made the hard part explicit, because checkmarks had to be read from real AppState and the feed renderer had to honor the same state. It passed without recorded stress after the registry and rebuild layer were already in place.

Help Menu Implementation

0 agents 20m 42s wall time 200k peak context 69.1k tokens out $12.75 nominal cost

Generated help and application identity views still exist, but later menu consolidation moved the public shape away from a standalone Help title in normal run mode. The current code keeps About-style Gantry menu entries and generated help behavior tied to registry data. The original Help menu contribution is therefore partly folded into the newer Gantry menu surface.

This sprint completed the first milestone by adding discoverability and context rather than another control surface. It reused the generated help from the registry and added metadata-driven About and stage-explainer views, so the fresh agent could work mostly at the edge between run metadata and overlays. The ledger and run facts record it as green.

Milestone 2

Pager and Tools

4 sprints 0 agents 1h 51m wall time 243k peak context $61.88 nominal cost

The live tree still has a dedicated artifact resolver, shared pager state, and clipboard module. Later work renamed the Tools surface to Inspect and moved assistant-specific controls to a separate Assistant divider menu. The infrastructure built here remains recognizable even though the menu labels no longer match the original plan.

This milestone owned the shared viewer and clipboard infrastructure, then proved both through Tools and Chat consumers. It is where the run had to adjust: reviews forced re-planning after the pager and clipboard sprints, and the metadata sprint drew an extra review note and implementation pass. That stress sits exactly where the brief predicted, at the boundary between reusable TUI components and engine-surfaced metadata.

Pager and Tools Viewers

0 agents 24m 16s wall time 193k peak context 83k tokens out $13.65 nominal cost

The shared pager remains the reader behind current Inspect file actions. The artifact resolver still enumerates ledgers, sprint files, reports, stage logs, journals, and related run files from the run's artifact directory. The old Tools name is gone, but the viewer behavior stands under Inspect and newer drill-downs.

This sprint built the shared read-only pager before asking other menus to rely on it. Its first consumer was deliberately concrete: Tools artifact viewers for ledgers, plans, sprint files, and reports. The sprint passed, then the milestone was re-planned, showing that the reusable viewer contract needed follow-on adjustment before the rest of the milestone continued.

Clipboard and Copy Tools

0 agents 13m 23s wall time 113k peak context 40.9k tokens out $5.87 nominal cost

The clipboard helper remains in its own TUI module, with a single availability predicate and copy path. Current Inspect copy items still use that helper and distinguish missing values from missing clipboard support. Assistant reply copying uses the same mechanism, so the shared behavior survived beyond the original Tools menu.

This sprint was scoped around one clipboard mechanism plus the first copy items that would use it. That made availability and disabled reasons testable without depending on a real system clipboard. It also triggered a later re-plan inside the milestone, because some copy values depended on metadata that the front-end did not yet receive.

Environment and Config Views

0 agents 51m 29s wall time 243k peak context 168k tokens out $30.45 nominal cost

Environment remains available through Inspect, rendered from run metadata through the shared pager. Tests still exercise resolved configuration, plan-source opening, worktree path, and branch values flowing through startup metadata into menu behavior. Some of the engine-side lines have been rewritten since, but the user-facing metadata path still stands.

This was the milestone's hardest unit because it had to carry resolved engine configuration into the front-end without inventing a new command path. It also finished earlier placeholders for plan source, worktree path, and branch by extending the same startup metadata channel. The review record shows a note followed by a second execution pass, so the integration pressure was here rather than in the simpler viewer and copy helpers.

Chat Menu

0 agents 16m 29s wall time 194k peak context 58.9k tokens out $9.04 nominal cost

The chat actions no longer appear as a top-level Chat menu in normal run mode. They survive on the Assistant divider surface, where Cancel turn, Copy last reply, Show assistant log, and MCP tools are still tested against live assistant state and registered tool definitions. The feature is intact under a newer placement.

This sprint used the pager and clipboard pieces in a different domain: the assistant pane. Its work was bounded by existing chat state and the registered MCP tool definitions, with no new engine commands required. After the metadata turbulence earlier in the milestone, this consumer sprint landed green.

Milestone 3

Run, Agents and Stats

4 sprints 0 agents 1h 1m wall time 193k peak context $35.86 nominal cost

The stats model is still a large standalone module, and the current bar still has a Stats title. Run controls now sit under the Gantry menu, and agent history has been compressed into Inspect instead of a standalone Agents title. The milestone's data and control behavior remains, but the top-level layout has been simplified by later work.

This milestone moved from menu infrastructure to live run semantics: statistics aggregation, the Stats menu, run controls, and agent session inspection. The cut kept the pure event fold first, then let menus read from it and from existing command channels. The run facts show no recorded fixes or retries here, which matches a dependency chain where the shared pager and metadata work had already been settled.

Stats Aggregation Layer

0 agents 10m 54s wall time 155k peak context 43k tokens out $4.76 nominal cost

The stats aggregation layer still lives in `src/stats.rs` and remains the common read model for menu and ticker surfaces. It exposes progress, timing, token, gate, retry, and richer panel projections from accumulated events. Later additions expanded the module, but the original pure-fold shape is still recognizable.

This sprint deliberately avoided rendering and built a reusable fold over the existing run event stream. That kept the problem memoryless-agent sized: define typed snapshots, preserve absent-versus-present values, and prove the math with synthetic events. Its green boundary gave the Stats menu and ticker a stable source to read.

Stats Menu

0 agents 12m 54s wall time 192k peak context 44.3k tokens out $8.34 nominal cost

Stats remains a top-level menu in the current run bar. Tests still assert that its rows are read-only info lines derived from the aggregate snapshot, including retry policy details and attention styling for active trouble states. The feature's public title survived more directly than most other menu areas from this job.

This sprint was thin by design because all computation had already been isolated. Its job was presentation: render the aggregate snapshot as read-only menu information, omit unknown values, and apply attention styling when the snapshot called for it. It stayed green, with most risk already handled by the previous unit.

Run Control Menu

0 agents 19m 20s wall time 193k peak context 68.8k tokens out $12.05 nominal cost

Run controls now live under the Gantry menu rather than a title named Run. Current tests still cover owner versus attacher behavior, merge capability, prompt focus, shell launch, status display through the pager, and command queuing for partial merge. The planned pause item remains absent, as the sprint brief required.

This sprint made lifecycle state visible through enabled and disabled menu items. It had to wire existing owner, attacher, map-run, prompt, abort, detach, merge, shell, and quit behavior without adding engine commands. The sprint landed cleanly, indicating the command boundary was narrow enough for one agent to hold.

Agent Sessions Menu

0 agents 13m 26s wall time 162k peak context 44.6k tokens out $7.96 nominal cost

The standalone Agents menu did not survive later consolidation. Its durable part is Stage logs under Inspect, which still lists recent stages most recent first and opens their logs in the shared pager. Current tests explicitly assert that the old Agents title is gone and that no kill-current-agent row was left behind.

This sprint completed the run-facing set by turning current and recent agent sessions into inspectable menu entries. It reused the existing session modal and the shared pager, while leaving kill-current-agent out because that would have required engine work. The run facts show a clean pass, so the boundary held around existing state and readers.

Milestone 4

Behaviors and Demo

6 sprints 0 agents 1h 39m wall time 189k peak context $49.59 nominal cost

The ticker, recent-events navigation, chat-only bar logic, demo fixtures, and verification suite remain in the current tree. Prompt attention has changed shape: the old injected prompt menu is now explicitly absent in tests, with prompt handling carried by other prompt surfaces. This milestone therefore left both surviving behavior and a recorded example of later product simplification.

The final milestone collected cross-cutting behavior that needed the earlier menus and stats to exist first: ticker formatting, prompt attention, recent navigation, chat-only state, demo fixtures, and verification consolidation. It stayed green throughout, which fits a sequence of additive checks over already-built primitives. Its last sprint also resolved a conditional palette decision against the menu crate rather than expanding application code.

Status Ticker Bar

0 agents 16m 19s wall time 159k peak context 54.9k tokens out $7.84 nominal cost

The ticker remains in its own TUI module as a formatter over the stats snapshot. It still truncates to fit the menu row, omits absent values, and ignores mouse hits as a readout rather than a control. Tests in that module pin compact and narrow-width behavior.

This sprint was a formatter and layout unit over the stats snapshot from the previous milestone. Its narrow charge was to show progress, elapsed time, and retry or park state in the bar without recomputing those values. It passed cleanly because the hard data model had already been built.

Prompt Attention Menu

0 agents 9m 54s wall time 122k peak context 32.8k tokens out $5.00 nominal cost

The injected prompt title no longer stands in the current menu bar. Current tests assert that prompt arrival does not add a Prompt title and does not disturb an unrelated View dropdown. The sprint's reconciliation concern still matters, but the visible prompt-attention menu was replaced by later prompt handling.

This sprint was asked to exercise dynamic bar mutation by adding and removing a styled prompt menu while preserving another open dropdown. The work was isolated to prompt state, title styling, and rebuild reconciliation; it did not need new engine commands. It passed in the original run, but later evidence shows this exact public behavior was not kept.

Recent Events Navigation

0 agents 21m 28s wall time 171k peak context 65k tokens out $10.53 nominal cost

Recent events remain under the current View menu. Tests still cover the empty disabled row, the submenu form when notable events exist, modal access, and jump ids that target feed cards. The exact bound and labels are rendered by the code, while the durable feature is the fixed event classifier plus jump behavior.

This sprint added a bounded fold of notable run events and a menu path back to their feed cards. Its boundary was clear: classify existing event kinds, keep the list ordered and bounded, and reuse the feed's scroll target. It stayed green and did not require new events.

Empty State Bar UI

0 agents 14m 9s wall time 157k peak context 42.9k tokens out $8.39 nominal cost

The current chat-only bar is reduced even further than the brief described: tests pin it to a Gantry-only surface, with run-shaped titles omitted. The read-only active-runs affordance survives as a Runs submenu inside that Gantry menu rather than as its own title. The no-faked-ticker behavior for runless state is still tested.

This sprint separated the runless chat front-end from normal build-run menus. It asked the agent to detect the same empty state the feed already knew about and replace irrelevant run menus with a reduced read-only surface. The sprint landed green, and later work revised the exact reduced title set.

Demo and Snapshot Testing

0 agents 19m 17s wall time 189k peak context 67.6k tokens out $9.49 nominal cost

The mock engine still carries demo fixtures for artifacts, prompt state, retry and park events, notable events, and stage logs. Current tests use that fixture to assert dynamic Inspect, Stats, stage-log, and menu-disabled behavior. Some snapshot expectations changed with the later bar consolidation, but the demo path still exercises the menu system.

This sprint was the integration visibility pass for the makeover. It depended on the preceding cross-cutting pieces and enriched demo state so populated menus, disabled reasons, checkmarks, pager artifacts, prompt state, notable events, and stats could all be seen together. It passed without recorded repair.

Palette and Verification Suite

0 agents 11m 25s wall time 122k peak context 37.2k tokens out $5.03 nominal cost

The command palette remains cleanly absent, with a test documenting that no palette action, title, or binding is wired because the crate did not ship that widget. The current TUI tests still carry the coherence, enabled-state, filter, stats, ticker, prompt-rebuild, artifact, assistant, and bar-shape assertions that this sprint consolidated. This is one of the clearest surviving parts of the job.

This capstone sprint had one conditional decision and one audit: do not build a command palette unless the menu crate had one, then consolidate the verification suite around the whole makeover. That was a good terminal unit because it read the state of the already-built system rather than adding another user surface by default. The run closed green.