dsh-plugin-subagent-model-route

dsh-plugin-subagent-model-route

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Annotate every subagent with the model route it actually ran on, in both places you look
at a subagent: the parent's catalog list and the child session's own header.

The parent's catalog: thirteen subagents, each row stacking the name, a mode · activity · route badge line, and the durable title below it. The routes shown (gpt-5.6-sol,
gpt-6-astra, qwen3-coder-flash, deepseek-flash) are the ones those delegations actually
ran on.

Opening a child session: the route (deepseek-flash) sits beside the lineage breadcrumb, in
the header, above the read-only one-shot composer notice.

Effect

Two surfaces change, and nothing else:

surface	before	after
Parent catalog row	name, then title · one-shot · running on one line	three lines: name / one-shot running gpt-5.6-sol / title
Child session header	breadcrumb switcher only	breadcrumb switcher + the route

A row whose child never issued a request shows no badge. Hovering a badge gives the full
provider/model · reasoningEffort, and the row's accessible name carries the route too.

Effect, expressed as consequences

Worth reading before installing. This plugin deliberately shadows shipped UI, and that has
a price:

1. Rows get taller. 44px → 59px, so the dropdown, capped at
   min(560px, 100vh - 140px), now shows roughly 9 rows instead of 12 before it scrolls.
2. You fork that region of the shipped UI. The catalog contract marks this seat
   replaceRisk: 'shadows-shipped-ui'. Upstream improvements to those two occupants —
   including DeepSeek adding a model column themselves — will not reach you; you have to
   re-vendor and re-apply the two modifications (see PATCH-RECORD.md).
3. A shipped-UI bug in that region becomes yours. The renderer is a verbatim copy of the
   shipped one (the copy even reproduces upstream's React duplicate-key warning about the child
   session id).
4. The stylesheet is injected twice. The vendored CSS module is a second copy of the
   shipped sheet, so the page carries both. It is small, and the hashed class names differ
   (different file content), so nothing collides.
5. The shipped occupants are shadowed, not unregistered. They stay registered and render
   nothing — a small, inert cost.
6. It duplicates the subagent-director dock if you run both. That plugin draws the route
   under the composer for an opened child; this one draws it in the header. Expect the route
   twice in the same view until you drop one of them.
7. The route is the last request's route. A child that switched models mid-life shows only
   the most recent one, and "no badge" means "never issued a request", not "unknown".
8. Only those two surfaces change. The read-only composer, the Sidebar chat tab, and the @
   reference source stay shipped.
9. Uninstalling reverts everything. Nothing is persisted and no host-side surface changes;
   remove the package from the profile's bundles and restart.
10. Activation needs a host restart. dsh.client is composition-level config and does not
    hot-reload.

Why this is a plugin that shadows the shipped UI

The shipped @deepseek-ai/dsh-client-ui-subagent decides what those two surfaces render, and
it cannot be extended additively: conversation.session.header.lineage is a single cell with
no registerOptions and no declared children, and there is no per-row slot at all. Taking the
seats over is the only way to add the route from outside.

The slot registry throws when a second registration lands on an occupied cell at the same
priority and shadows on any different one, so this plugin registers both seats at
priority: -1 (the shipped occupants own the default 0):

seat	shipped occupant	how this plugin takes it
conversation.session.header.lineage (single)	SubagentHeaderLineage	shadow at priority -1
conversation.session.header.actions (list)	SubagentCatalogAction (id subagent-catalog)	re-register the same id at priority -1

The route itself comes from the durable modelSelection projection (recorded on every
request/header), read through the same summary.projectionValues the row already uses for
token usage and timing — so this adds no RPC, no host change, no projection, no new slot.

Mounting

Mount it as a profile bundle, exactly like any other local plugin:

// ~/.dsh/profiles/web/package.json
"dependencies": {
  "dsh-plugin-subagent-model-route": "link:/path/to/dsh-plugin-subagent-model-route"
},
"dsh": { "profile": { "bundles": [
  // ...after @deepseek-ai/dsh-base and @deepseek-ai/dsh-web-app
  "dsh-plugin-subagent-model-route"
] } }

Or install it the supported way, which edits both lists for you:

dsh plugin --profile web add dsh-plugin-subagent-model-route     # from npm
dsh plugin --profile web add ./dsh-plugin-subagent-model-route   # from a checkout

Then restart the host.

Development

node_modules/ in this checkout is a dev-only shim of symlinks into a harness checkout (the
host's own react/react-dom/@deepseek-ai/*, plus the monorepo's tooling), because the
@deepseek-ai/* packages are only published to npm as a 0.0.1-rc.1 placeholder. A normal
npm install against the versions listed in devDependencies replaces it.

npm run check      # typecheck -> build -> headless smoke (15 checks)
npm run build      # tsdown: lib/index.js (host half) + lib/client/index.js (closure factory)
npm run watch
npm run smoke      # renders both seized seats under jsdom

The out-of-tree build in tsdown.config.ts restates the two contracts the
monorepo's own clientBundle() preset enforces — the
window.__ModuleLoader__.load({ id, factory }) handoff, and the lightningcss pass that turns
*.module.css into a hashed class map plus a tagged <style> injection — because that preset
locates packages by globbing the monorepo and cannot build a package outside it. The build needs
only tsdown + lightningcss: the host-provided packages stay external and are never
resolved, which is what keeps a git install from failing on unpublished @deepseek-ai/*
versions.

scripts/smoke.mjs runs the real artifact through the real handoff and asserts, among other
things, that the bundle's require set is exactly the four platform seed rows (react,
react/jsx-runtime, react-dom, @deepseek-ai/dsh-client-ui-primitives) — a request the host's
module table cannot answer would be a guaranteed runtime throw.

Publishing

See PUBLISHING.md for the full checklist, the DSH-specific traps, and the
catalog-submission steps. The short version: fill in the CHANGE-ME repository fields, publish to
npm with lib/ built at publish time, verify in a clean profile, tag the repo with the
dsh-plugin topic, then submit to the community catalogs.

Maintenance

The vendored renderer is pinned to the shipped one at deepseek-ai/deepseek-harness
master @ 5badb15009. When upstream changes SubagentHeaderLineage.tsx or its stylesheet,
re-vendor and re-apply the two modifications from PATCH-RECORD.md — or, on a
machine that owns the harness checkout, prefer the equivalent upstream patch
(UPSTREAM-PATCH.patch), which needs no shadowing at all.

License

MIT — see LICENSE. The vendored renderer originates from the MIT-licensed
@deepseek-ai/dsh-client-ui-subagent.