Single-source the history wire types shared by server and web

[selfcontained]

Sub-item (d) of the server↔web wire-type duplication cluster found by the 2026-08-14 audit's duplicate-block scan (5 mirrored 7-line windows — the largest remainder after #965, #971 and #976).

What was duplicated

apps/web/src/hooks/use-agent-history.ts hand-wrote five response shapes that apps/server/src/routes/activity/history-routes.ts restated inline as deps.pool.query<{...}> generics:

shape	server (before)	web (before)
child agent	local type ChildAgent	HistoryChildAgent
event row	inline generic on the events query	HistoryEvent
token totals + by-model	two inline generics	HistoryTokenUsage
media row	inline generic	HistoryMedia
feedback row	inline generic	HistoryFeedbackItem

What changed

New dependency-free leaf apps/server/src/routes/activity/history-wire.ts (73 lines, zero imports, no classes) declares them once. history-routes.ts uses them as its pool.query<> generics; use-agent-history.ts type-imports them and re-exports every name it exported before, so no consumer of either module changed.

HistoryLatestEvent is named because the same {type, message, updatedAt, metadata} object was restated three times (server ChildAgent, web HistoryChildAgent, web HistoryAgent).

3 files, +32/−119.

Why Shape B (leaf extraction) and not a direct import

history-routes.ts imports ./shared.js, whose ActivityRouteDeps pulls in AgentManager — i.e. most of the server graph would land in web's TS program. The class probe (grep -n '^export class\|^class') came back empty, but the service-layer graph settles it on its own. The leaf was verified against web's TS program with apps/server/src/generated/ absent (pnpm run check:web before pnpm run check, which creates that directory as a side effect).

Drift

None. All five shapes were field-for-field identical; only declaration order differed (web listed totalTokens before latestEvent on the child agent). No web field turned out to be an un-mirrored wire field this time.

Deliberately excluded

• HistoryAgent / HistoryAgentsResponse / HistoryAgentDetail stay web-local. The server's agents-list and agent-detail queries carry no type generic at all, so there is nothing to share — typing those rows would be adding new server-side typing, not removing a duplicate.
• messages: AgentMessage[] keeps pointing at @/hooks/use-agent-messages. The message row is sub-item (g) of the same cluster (messages/store.ts vs use-agent-messages.ts) and belongs to its own run.
• TokenStats in apps/web/src/hooks/use-activity.ts:168 looks like HistoryTokenTotals but carries an extra total_sessions, and is produced by a different route (token-routes.ts). Not merged — it is a separate duplication pair (backlogged), and merging would widen the history payload's contract.
• TokenByModel (use-activity.ts:209) vs the new HistoryTokenByModel: same lookalike situation — five fields vs three, different route, different SQL. Left alone.
• size_bytes: in apps/server/src/media/store.ts:18 and server/mcp-handlers.ts:1058 — same field name, different domain row (the media store's own shape, not the history payload's media entry).
• handleHistoryProjects's projectOptions return type stays anonymous; web's useHistoryProjects only reads projects: string[], so there is no second declaration to remove.

Completeness check

Content-grep on middle fields, counting declaration sites: total_cache_creation and mediaRef and size_bytes: each resolve to exactly one declaration for the history payload (history-wire.ts) outside test fixtures. The remaining hits are the token/activity pair and the media-store row listed above.

Checks

pnpm run check:web (with generated/ absent) · pnpm run check · pnpm run finalize:web · web vitest 1000/1000 · server vitest 2797 passed / 9 skipped · pnpm run test:e2e 181 passed / 12 skipped.

Queued next

Sub-item (e) of the cluster: apps/server/src/release-info.ts vs apps/web/src/hooks/use-cached-release-info.ts (3 windows).

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