diff --git a/docs/api-reference.md b/docs/api-reference.md
index b4d1288..fb3cbfb 100644
--- a/docs/api-reference.md
+++ b/docs/api-reference.md
@@ -603,6 +603,13 @@ but valid "last scanned at site X" is more useful than nulling it.
 - `meta` — `{ provider, model }` (first)
 - `delta` — `{ text }` (repeated, as the model streams)
 - `tool` — `{ name }` (when a tool is called)
+- `chart` — a `ChartSpec` (`src/lib/reports/chart-spec.ts`:
+  `{ id, kind, title, subtitle?, xKey, xLabel?, series[{ key, label, format }], stacked?, rows }`),
+  once per chart a report tool returned. Sent **instead of** handing the
+  chart to the model: the tool result the model sees has `charts` replaced
+  by `chartsAvailable: { id, title }[]`, and the model places a chart by
+  writing `[[chart:<id>]]` on its own line. `id` matches
+  `/^[a-z0-9-]{1,64}$/`; specs with any other id are dropped.
 - `done` — `{ text, iterations, stoppedOnLimit }` (final)
 - `error` — `{ message }` (on failure)
 
diff --git a/docs/modules.md b/docs/modules.md
index 1075719..916c358 100644
--- a/docs/modules.md
+++ b/docs/modules.md
@@ -343,17 +343,81 @@ arithmetic** — every figure comes from a metric, every money string is
 pre-formatted. The "you must not compute" rule is the load-bearing
 correctness property of this module.
 
-**Tools exposed** (full list in `src/lib/agent/tools.ts:125-...`):
+**Tools exposed** (all read-only; definitions in `src/lib/agent/tools.ts`,
+also served by the MCP server `src/mcp/server.ts`):
 
-- `list_sites` — portfolio financials
-- `site_financials` — one site's full P&L
-- `attention` — current vehicle flags
-- `list_purchase_orders`, `purchase_order` — PO lookup
-- `list_delivery_notes`, `delivery_note` — DN lookup
-- `list_vehicles`, `vehicle_fuel_logs` — fleet drill-down
-- `workforce_hours` — payroll and weekly hours
-- `site_expenses` / `site_income` — focused views
-- `import_batches` — what the importers are doing right now
+- Lookups: `list_sites`, `get_site_financials`, `get_site_trend`,
+  `vehicles_needing_attention`, `get_fuel_summary`, `get_vehicle_fuel_log`,
+  `get_pending_verification`, `get_purchase_order`, `list_purchase_orders`,
+  `get_delivery_note`, `list_delivery_notes`, `list_plant_hours`,
+  `list_fixed_costs`, `list_income_claims`, `list_employees`, `top_workers`,
+  `list_imports`.
+- Knowledge tools (2026-09): `attendance_today` (the On-site page's grouping,
+  `src/lib/attendance.ts`), `supplier_balances` (the Suppliers page's roll-up,
+  `src/lib/metrics/supplier-balance.ts`), `delivery_note_queue` (inbox board
+  counts via `src/lib/dn-pipeline/board.ts` + open work-queue exceptions),
+  `plant_equipment_summary` (guarded `hoursBetweenReadings`, `isPlant`;
+  matches the Equipment page's hours and value), `rain_outlook`
+  (`loadRainOutlook`, as on the Overview rain card).
+- Report tools (return charts): `site_report`, `portfolio_report`,
+  `problem_report`, `improvement_report`. Pure builders live in
+  `src/lib/reports/` (`site-report.ts`, `portfolio-report.ts`,
+  `problems.ts`, `improvements.ts`, `findings.ts`); `src/lib/reports/load.ts`
+  is that folder's only network code. `list_sites` and `portfolio_report`
+  share `computeSiteSummaries` (`src/lib/reports/site-summary.ts`).
+
+**Findings.** Problem and improvement reports return `Finding`s
+(`{ id, severity: high|medium|low, area, title, detail, href?, site? }`),
+ranked high → low, plus a `summary` count per severity. Every title and
+detail is display-ready; a rule that spans sites returns one finding with
+the total in its title and the per-site split in its detail, so the model
+never adds counts. A site "on track" but projecting a loss is flagged as a
+high-severity loss, and its status KPI carries a "Projected loss" note.
+
+**Charts.** A report tool returns `charts: ChartSpec[]`
+(`src/lib/reports/chart-spec.ts`: `id`, `kind` bar/line/area/donut,
+`title`, `xKey`, `series[{ key, label, format }]`, `rows`). The chat route
+runs every tool result through `extractCharts`: the specs are streamed to
+the browser as `chart` SSE events and the model receives only
+`chartsAvailable: { id, title }[]` — it never sees a chart's numbers. The
+model places a chart by writing `[[chart:<id>]]` alone on a line;
+`splitAnswer` (`src/lib/reports/answer-parts.ts`) swaps the token for
+`<ReportChart>` (`src/app/dashboard/chat/report-chart.tsx`, Recharts).
+Tokens for unknown ids stay as text; charts the model never placed are
+appended after the answer finishes. Each chart has a Table view and a
+Download CSV button (raw numbers). Colours are the `--series-N` slots on
+`.report-chart` in `globals.css`, validated separately for light and dark.
+"Save as PDF" (browser print) pins chart size via the `.printing-answer`
+print rule.
+
+**Prompt.** `buildSystemPrompt(now)` is built per request (the date is
+Johannesburg's today, not the server's boot date). Besides the arithmetic
+ban it carries a business glossary (P&G, burn vs elapsed, fleet km/L vs
+plant L/h, DN/PO fulfilment, MEGA Clock), report layout rules (headline,
+KPI table, charts, findings by severity; "My read" and "What I'd do next"
+for `/findings` and improvement reports only), the chart-token grammar and
+a rule to link `href`s.
+
+**Slash shortcuts.** Typed in the chat input; expanded client-side by
+`src/lib/chat/slash-commands.ts` into a prompt that names the tools to
+call. Typing `/` opens a menu (↑/↓ move, Tab or Enter completes, Esc
+closes). The user's turn shows the short command; the model gets the
+expanded prompt. `/help` is answered locally with no model call. The empty
+state shows `/today`, `/portfolio`, `/problems`, `/findings` chips.
+
+| Command | Args | Tools it asks for |
+| --- | --- | --- |
+| `/site <name>` | site name or code (required) | `site_report`, `problem_report` for that site |
+| `/portfolio` | — | `portfolio_report` |
+| `/problems [site]` | optional site | `problem_report` |
+| `/improvements [site]` | optional site | `improvement_report` (+ "My read") |
+| `/findings` | — | `portfolio_report`, `problem_report`, `improvement_report` (+ "My read", "What I'd do next") |
+| `/fuel [site]` | optional site | `get_fuel_summary` + `vehicles_needing_attention` (site: `site_report` + attention) |
+| `/plant [site]` | optional site | `plant_equipment_summary` |
+| `/workforce [site]` | optional site | `top_workers`, `attendance_today` |
+| `/purchasing [site]` | optional site | `list_purchase_orders`, `problem_report`, `delivery_note_queue`, `supplier_balances` |
+| `/today` | — | `attendance_today`, `problem_report`, `rain_outlook`, `delivery_note_queue` |
+| `/help` | — | none (local) |
 
 Each tool's free-text site query is resolved through `resolveSite` first —
 ambiguity is returned as an error string that the model relays to the user
@@ -363,7 +427,8 @@ verbatim.
 (vision is model-gated — see the `MiniMax-M3` note in
 [`operations.md §1`](./operations.md#1-environment-variables)).
 
-**API routes called.** `POST /api/chat` (Server-Sent Events stream).
+**API routes called.** `POST /api/chat` (Server-Sent Events stream,
+including `chart` events — see [api-reference §12](./api-reference.md#12-chat-gated)).
 
 **Gating.** Both the page (`src/app/dashboard/chat/page.tsx:31`) and the
 route (`src/app/api/chat/route.ts:69-71`) 404 unless `ENABLE_CHAT=true`.