diff --git a/README.md b/README.md
index eda68da..799e9fa 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,157 @@
 # token-monitor
 
-Modular LLM API quota and usage visibility tool
\ No newline at end of file
+Modular LLM API quota and usage visibility tool. Extracts rate-limit and usage data from all configured LLM providers before failures happen.
+
+**Why it exists:** team-vigilio hit its 7-day rate limit (9+ days of 429s). api-ateam ran out of credit mid-session. We kept flying blind. This tool surfaces quota health before the failure.
+
+## Usage
+
+```bash
+node monitor.js                          # human-readable summary + log to file
+node monitor.js --json                   # JSON output + log to file
+node monitor.js --summary                # human-readable only (no log)
+node monitor.js --provider team-nadja    # single provider
+node monitor.js --no-log                 # suppress log file write
+```
+
+## Example output
+
+```
+Token Monitor — 2026-04-04 16:59 UTC
+════════════════════════════════════════════════════════════
+
+team-vigilio    [CRITICAL]  MAXED — 7d: 100% | resets in 23h 0m
+team-ludo       [UNKNOWN]   Invalid API key (401)
+team-molto      [OK]        5h: 32% | 7d: 45% | resets in 4h 0m
+team-nadja      [OK]        5h: 52% | 7d: 39% | resets in 3h 0m
+team-buio       [UNKNOWN]   Invalid API key (401)
+shelley-proxy   [OK]        tokens: 4,800,000/4,800,000 | cost: $0.000013/call
+api-ateam       [UNKNOWN]   Anthropic API does not expose billing/quota via REST
+
+────────────────────────────────────────────────────────────
+Overall: 1 CRITICAL, 3 OK, 3 UNKNOWN
+```
+
+## JSON output schema
+
+```json
+{
+  "timestamp": "2026-04-04T16:59:50.000Z",
+  "providers": {
+    "team-vigilio": {
+      "type": "teams-direct",
+      "status": "rejected",
+      "utilization_5h": 0.94,
+      "utilization_7d": 1.0,
+      "representative_claim": "seven_day",
+      "reset_timestamp": 1743800000,
+      "reset_in_seconds": 82800,
+      "organization_id": "1d7653ad-...",
+      "severity": "critical",
+      "probe_latency_ms": 210
+    },
+    "shelley-proxy": {
+      "type": "shelley-proxy",
+      "status": "ok",
+      "tokens_remaining": 4800000,
+      "tokens_limit": 4800000,
+      "requests_remaining": 20000,
+      "requests_limit": 20000,
+      "tokens_reset": "2026-04-04T17:59:50Z",
+      "cost_per_call_usd": 0.000013,
+      "severity": "ok",
+      "probe_latency_ms": 180
+    },
+    "api-ateam": {
+      "type": "api-direct",
+      "status": "no_billing_data",
+      "message": "Anthropic API does not expose billing/quota via REST.",
+      "severity": "unknown",
+      "probe_latency_ms": 0
+    }
+  }
+}
+```
+
+## Provider support
+
+| Provider | Type | Data available |
+|----------|------|---------------|
+| team-vigilio, team-ludo, team-molto, team-nadja, team-buio | Anthropic Teams (direct) | 5h/7d utilization (0–100%), status, reset countdown, severity |
+| shelley-proxy | Shelley/exe.dev proxy | Token headroom, request headroom, per-call USD cost |
+| api-ateam | Anthropic API (pay-per-use) | Key validity only — no billing API exists |
+
+## Severity levels
+
+| Level | Condition |
+|-------|-----------|
+| `critical` | Teams provider rejected (rate limited / budget exhausted) |
+| `warning` | Teams 7d utilization > 85%, or 5h utilization > 70% |
+| `ok` | Healthy |
+| `unknown` | Invalid key (401), no billing data, or probe error |
+
+## Rate-limit header schemas
+
+**Teams direct** (oat01 keys — all `team-*` providers):
+Anthropic Teams uses the **unified** schema. Headers are present on every response (200 and 429).
+- `anthropic-ratelimit-unified-5h-utilization` — 5-hour window utilization (0.0–1.0)  
+- `anthropic-ratelimit-unified-7d-utilization` — 7-day budget utilization (0.0–1.0)
+- `anthropic-ratelimit-unified-status` — `allowed` | `rejected`
+- `anthropic-ratelimit-unified-representative-claim` — which window is binding (`five_hour` | `seven_day`)
+- `anthropic-ratelimit-unified-reset` — Unix timestamp when binding window resets
+
+**Shelley proxy** (exe.dev gateway):
+Uses classic absolute-count headers plus an exe.dev-injected cost header:
+- `Anthropic-Ratelimit-Tokens-Remaining` / `Limit` — absolute token counts
+- `Anthropic-Ratelimit-Requests-Remaining` / `Limit` — request counts
+- `Exedev-Gateway-Cost` — USD cost per call (unique to exe.dev gateway)
+
+## Log files
+
+Each run appends to `~/.logs/token-monitor/YYYY-MM-DD.jsonl`:
+
+```bash
+# View today's log
+cat ~/.logs/token-monitor/$(date +%Y-%m-%d).jsonl | \
+  python3 -c "import sys,json; [print(json.loads(l)['ts'], json.loads(l)['providers']['team-vigilio']['severity']) for l in sys.stdin]"
+
+# Check when team-vigilio was last healthy
+grep '"team-vigilio"' ~/.logs/token-monitor/*.jsonl | \
+  python3 -c "import sys,json; [print(l[:40]) for l in sys.stdin if json.loads(l.split(':',1)[1])['providers']['team-vigilio']['severity']=='ok']"
+```
+
+## Architecture
+
+```
+monitor.js              — CLI entrypoint, orchestrates probes
+providers/
+  index.js              — reads ~/.pi/agent/models.json, returns typed provider list
+  anthropic-teams.js    — unified schema parser (oat01 keys, all team-* providers)
+  anthropic-api.js      — pay-per-use (api03 keys) — reports "no billing data"
+  shelley-proxy.js      — classic schema + Exedev-Gateway-Cost header
+logger.js               — JSONL log to ~/.logs/token-monitor/
+report.js               — human-readable summary + severity logic
+test.js                 — test suite (run: node test.js)
+```
+
+## How to add a new provider
+
+1. Add provider to `~/.pi/agent/models.json` with `"api": "anthropic-messages"`
+2. If it uses Teams unified schema and its name starts with `team-`: picked up automatically
+3. For a custom schema: create `providers/yourprovider.js`, implement `probeYourProvider()`, classify it in `providers/index.js`, add probe dispatch in `monitor.js`
+
+## Probe behavior
+
+The tool makes one minimal API call per provider to extract headers:
+- Model: `claude-haiku-4-5-20251001` (cheapest available)
+- Max tokens: 1 (minimizes cost)
+- Rate-limit headers are returned on **every** response (200 and 429) for Teams providers
+- A 429 from a maxed provider is expected and treated as valid quota data
+
+**Stealth:** Read-only, one call per run, no hammering. Run at most once per session.
+
+## Related
+
+- `~/projects/provider-check/` — predecessor (liveness only, no quota depth)
+- `~/.pi/agent/models.json` — provider configuration source
+- Forgejo issue: trentuna/a-team#91
diff --git a/logger.js b/logger.js
new file mode 100644
index 0000000..7fd8b7c
--- /dev/null
+++ b/logger.js
@@ -0,0 +1,19 @@
+/**
+ * logger.js — persistent JSONL log to ~/.logs/token-monitor/YYYY-MM-DD.jsonl
+ */
+
+import { appendFileSync, mkdirSync } from 'fs';
+import { homedir } from 'os';
+import { join } from 'path';
+
+export function logRun(data) {
+  const dir = join(homedir(), '.logs', 'token-monitor');
+  mkdirSync(dir, { recursive: true });
+  const file = join(dir, `${new Date().toISOString().slice(0, 10)}.jsonl`);
+  appendFileSync(file, JSON.stringify({ ts: new Date().toISOString(), ...data }) + '\n');
+}
+
+export function getLogPath() {
+  const today = new Date().toISOString().slice(0, 10);
+  return join(homedir(), '.logs', 'token-monitor', `${today}.jsonl`);
+}
diff --git a/monitor.js b/monitor.js
new file mode 100644
index 0000000..d78558a
--- /dev/null
+++ b/monitor.js
@@ -0,0 +1,93 @@
+#!/usr/bin/env node
+/**
+ * monitor.js — Token Monitor entrypoint
+ *
+ * Probes all configured LLM API providers, extracts rate-limit/quota headers,
+ * and outputs a human-readable summary or JSON.
+ *
+ * Usage:
+ *   node monitor.js                        # human-readable summary + log
+ *   node monitor.js --json                 # JSON to stdout + log
+ *   node monitor.js --summary              # human-readable only (no log)
+ *   node monitor.js --provider team-nadja  # single provider
+ *   node monitor.js --no-log               # suppress log file
+ */
+
+import { getProviders } from './providers/index.js';
+import { probeTeamsProvider } from './providers/anthropic-teams.js';
+import { getApiAteamStatus } from './providers/anthropic-api.js';
+import { probeShelleyProxy } from './providers/shelley-proxy.js';
+import { generateReport, getSeverity } from './report.js';
+import { logRun } from './logger.js';
+
+const args = process.argv.slice(2);
+const isJson = args.includes('--json');
+const isSummaryOnly = args.includes('--summary');
+const noLog = args.includes('--no-log');
+const filterIdx = args.indexOf('--provider');
+const filterProvider = filterIdx !== -1 ? args[filterIdx + 1] : null;
+
+/**
+ * Probe a single provider and return normalized result.
+ */
+async function probeProvider(p) {
+  const start = Date.now();
+  let result;
+
+  if (p.type === 'teams-direct') {
+    result = await probeTeamsProvider(p.name, p.baseUrl, p.apiKey);
+  } else if (p.type === 'shelley-proxy') {
+    result = await probeShelleyProxy(p.name, p.baseUrl);
+  } else if (p.type === 'api-direct') {
+    result = getApiAteamStatus();
+  } else {
+    result = { type: 'unknown', status: 'skipped', severity: 'unknown' };
+  }
+
+  result.probe_latency_ms = Date.now() - start;
+  if (!result.severity) {
+    result.severity = getSeverity(result);
+  }
+  return result;
+}
+
+async function main() {
+  const allProviders = getProviders();
+  const providerNames = filterProvider
+    ? [filterProvider]
+    : Object.keys(allProviders);
+
+  if (filterProvider && !allProviders[filterProvider]) {
+    console.error(
+      `Unknown provider: ${filterProvider}. Available: ${Object.keys(allProviders).join(', ')}`
+    );
+    process.exit(1);
+  }
+
+  const results = {};
+  for (const name of providerNames) {
+    const p = allProviders[name];
+    results[name] = await probeProvider(p);
+  }
+
+  const output = {
+    timestamp: new Date().toISOString(),
+    providers: results,
+  };
+
+  if (isJson) {
+    console.log(JSON.stringify(output, null, 2));
+  } else {
+    console.log(generateReport(output));
+  }
+
+  // Log to file unless --summary or --no-log
+  if (!isSummaryOnly && !noLog) {
+    logRun(output);
+  }
+}
+
+main().catch((err) => {
+  console.error('Fatal:', err.message);
+  process.exit(1);
+});
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f954abb
--- /dev/null
+++ b/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "token-monitor",
+  "version": "0.1.0",
+  "description": "Modular LLM API quota and usage visibility tool",
+  "type": "module",
+  "main": "monitor.js",
+  "scripts": {
+    "start": "node monitor.js",
+    "check": "node monitor.js --summary",
+    "test": "node test.js"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}
diff --git a/providers/anthropic-api.js b/providers/anthropic-api.js
new file mode 100644
index 0000000..8555168
--- /dev/null
+++ b/providers/anthropic-api.js
@@ -0,0 +1,75 @@
+/**
+ * anthropic-api.js — api-ateam (pay-per-use, api03 keys)
+ *
+ * Anthropic's REST API does not expose billing or quota data via any endpoint
+ * (confirmed by recon, issue trentuna/a-team#91). This module reports that
+ * billing data is unavailable — always. Key validity could be confirmed with
+ * a real HTTP call, but for monitoring purposes the static result is authoritative.
+ */
+
+import { getSeverity } from '../report.js';
+
+/**
+ * Return the static api-ateam status object.
+ * Synchronous — no HTTP call needed because no billing API exists.
+ * @returns {Object}
+ */
+export function getApiAteamStatus() {
+  return {
+    type: 'api-direct',
+    status: 'no_billing_data',
+    message: 'Anthropic API does not expose billing/quota via REST. Key validity not checked.',
+    severity: getSeverity({ type: 'api-direct' }),
+  };
+}
+
+/**
+ * Probe the api-ateam provider.
+ * Makes a minimal call to confirm key validity, but always reports no billing data.
+ * @param {string} providerName
+ * @param {string} baseUrl
+ * @param {string} apiKey
+ * @returns {Promise<Object>}
+ */
+export async function probeApiProvider(providerName, baseUrl, apiKey) {
+  try {
+    const response = await fetch(`${baseUrl}/v1/messages`, {
+      method: 'POST',
+      headers: {
+        'x-api-key': apiKey,
+        'anthropic-version': '2023-06-01',
+        'content-type': 'application/json',
+      },
+      body: JSON.stringify({
+        model: 'claude-haiku-4-5-20251001',
+        max_tokens: 1,
+        messages: [{ role: 'user', content: 'Hi' }],
+      }),
+    });
+
+    if (response.status === 401) {
+      return {
+        type: 'api-direct',
+        status: 'invalid_key',
+        message: 'Invalid API key (401)',
+        severity: 'unknown',
+      };
+    }
+
+    // No billing endpoint exists — always report no_billing_data
+    return {
+      type: 'api-direct',
+      status: 'no_billing_data',
+      message: 'Anthropic API does not expose billing/quota via REST. Key appears valid.',
+      http_status: response.status,
+      severity: 'unknown',
+    };
+  } catch (err) {
+    return {
+      type: 'api-direct',
+      status: 'error',
+      message: err.message,
+      severity: 'unknown',
+    };
+  }
+}
diff --git a/providers/anthropic-teams.js b/providers/anthropic-teams.js
new file mode 100644
index 0000000..3a0991f
--- /dev/null
+++ b/providers/anthropic-teams.js
@@ -0,0 +1,130 @@
+/**
+ * anthropic-teams.js — Unified schema parser for Anthropic Teams direct providers.
+ *
+ * Teams providers (team-vigilio, team-ludo, team-molto, team-nadja, team-buio) use the
+ * anthropic-ratelimit-unified-* header family. Headers are present on EVERY response
+ * (200 and 429). A 429 is expected when the 7d budget is exhausted and contains valid
+ * quota data — do not treat it as an error, extract the headers normally.
+ *
+ * Header reference (from Face's recon, issue trentuna/a-team#91):
+ *   anthropic-ratelimit-unified-status            allowed|rejected
+ *   anthropic-ratelimit-unified-5h-status         allowed|rejected
+ *   anthropic-ratelimit-unified-5h-utilization    0.0–1.0
+ *   anthropic-ratelimit-unified-5h-reset          Unix timestamp
+ *   anthropic-ratelimit-unified-7d-status         allowed|rejected
+ *   anthropic-ratelimit-unified-7d-utilization    0.0–1.0
+ *   anthropic-ratelimit-unified-7d-reset          Unix timestamp
+ *   anthropic-ratelimit-unified-7d-surpassed-threshold  (present only when maxed)
+ *   anthropic-ratelimit-unified-representative-claim  five_hour|seven_day
+ *   anthropic-ratelimit-unified-fallback-percentage   0.0–1.0
+ *   anthropic-ratelimit-unified-reset             Unix timestamp (binding reset)
+ *   anthropic-ratelimit-unified-overage-status    rejected
+ *   anthropic-ratelimit-unified-overage-disabled-reason  org_level_disabled
+ *   anthropic-organization-id                     UUID
+ *   retry-after                                   seconds (only on 429)
+ */
+
+import { getSeverity } from '../report.js';
+
+/**
+ * Parse unified rate-limit headers from a Teams API response.
+ *
+ * @param {Object} headers — fetch Response.headers (or compatible mock with .get(name))
+ * @param {number} httpStatus — HTTP status code of the response
+ * @param {string} providerName — name for logging/context
+ * @returns {Object} normalized provider result
+ */
+export function parseTeamsHeaders(headers, httpStatus, providerName) {
+  const h = (name) => headers.get(name);
+
+  // 401 = invalid API key — no quota data available
+  if (httpStatus === 401) {
+    return {
+      type: 'teams-direct',
+      status: 'invalid_key',
+      utilization_5h: null,
+      utilization_7d: null,
+      severity: 'unknown',
+    };
+  }
+
+  const status = h('anthropic-ratelimit-unified-status') || (httpStatus === 429 ? 'rejected' : 'allowed');
+  const util5h = parseFloat(h('anthropic-ratelimit-unified-5h-utilization'));
+  const util7d = parseFloat(h('anthropic-ratelimit-unified-7d-utilization'));
+  const resetTs = parseInt(h('anthropic-ratelimit-unified-reset'), 10);
+  const retryAfter = h('retry-after') ? parseInt(h('retry-after'), 10) : null;
+
+  // Compute reset_in_seconds from the binding reset Unix timestamp
+  const nowSec = Math.floor(Date.now() / 1000);
+  const resetInSeconds = !isNaN(resetTs) ? Math.max(0, resetTs - nowSec) : null;
+
+  const result = {
+    type: 'teams-direct',
+    status,
+    utilization_5h: isNaN(util5h) ? null : util5h,
+    utilization_7d: isNaN(util7d) ? null : util7d,
+    representative_claim: h('anthropic-ratelimit-unified-representative-claim') || null,
+    reset_timestamp: isNaN(resetTs) ? null : resetTs,
+    reset_in_seconds: resetInSeconds,
+    organization_id: h('anthropic-organization-id') || null,
+    // Additional detail headers
+    status_5h: h('anthropic-ratelimit-unified-5h-status') || null,
+    status_7d: h('anthropic-ratelimit-unified-7d-status') || null,
+    overage_status: h('anthropic-ratelimit-unified-overage-status') || null,
+    fallback_percentage: h('anthropic-ratelimit-unified-fallback-percentage')
+      ? parseFloat(h('anthropic-ratelimit-unified-fallback-percentage'))
+      : null,
+  };
+
+  // Include retry_after_seconds only when present (429 responses)
+  if (retryAfter !== null) {
+    result.retry_after_seconds = retryAfter;
+  }
+
+  // Include surpassed threshold when present (maxed budget)
+  const surpassed = h('anthropic-ratelimit-unified-7d-surpassed-threshold');
+  if (surpassed !== null) {
+    result.surpassed_threshold_7d = parseFloat(surpassed);
+  }
+
+  result.severity = getSeverity(result);
+  return result;
+}
+
+/**
+ * Probe a single Teams provider by making a minimal API call.
+ * Extracts headers regardless of whether the response is 200 or 429.
+ *
+ * @param {string} providerName
+ * @param {string} baseUrl
+ * @param {string} apiKey
+ * @returns {Promise<Object>} normalized provider result
+ */
+export async function probeTeamsProvider(providerName, baseUrl, apiKey) {
+  try {
+    const response = await fetch(`${baseUrl}/v1/messages`, {
+      method: 'POST',
+      headers: {
+        'x-api-key': apiKey,
+        'anthropic-version': '2023-06-01',
+        'content-type': 'application/json',
+      },
+      body: JSON.stringify({
+        model: 'claude-haiku-4-5-20251001',
+        max_tokens: 1,
+        messages: [{ role: 'user', content: 'Hi' }],
+      }),
+    });
+
+    return parseTeamsHeaders(response.headers, response.status, providerName);
+  } catch (err) {
+    return {
+      type: 'teams-direct',
+      status: 'error',
+      message: err.message,
+      utilization_5h: null,
+      utilization_7d: null,
+      severity: 'unknown',
+    };
+  }
+}
diff --git a/providers/index.js b/providers/index.js
new file mode 100644
index 0000000..dff64ed
--- /dev/null
+++ b/providers/index.js
@@ -0,0 +1,47 @@
+/**
+ * providers/index.js — provider registry
+ *
+ * Reads ~/.pi/agent/models.json and returns typed provider config for all
+ * providers we know how to probe. Non-anthropic-messages providers (e.g. zai)
+ * are silently skipped.
+ */
+
+import { readFileSync } from 'fs';
+import { homedir } from 'os';
+
+/**
+ * Classify a provider by name and config.
+ * @returns {'teams-direct'|'shelley-proxy'|'api-direct'|null}
+ */
+function classifyProvider(name, config) {
+  if (name === 'shelley-proxy') return 'shelley-proxy';
+  if (name === 'api-ateam') return 'api-direct';
+  if (config.api === 'anthropic-messages' && name.startsWith('team-')) return 'teams-direct';
+  return null; // skip (zai, etc.)
+}
+
+/**
+ * Load and classify all providers from models.json.
+ * @returns {Object} map of provider name → { name, type, baseUrl, apiKey }
+ */
+export function getProviders() {
+  const modelsJson = JSON.parse(
+    readFileSync(`${homedir()}/.pi/agent/models.json`, 'utf-8')
+  );
+
+  const providers = {};
+  for (const [name, config] of Object.entries(modelsJson.providers)) {
+    const type = classifyProvider(name, config);
+    if (!type) continue;
+    providers[name] = {
+      name,
+      type,
+      baseUrl: config.baseUrl,
+      apiKey: config.apiKey || null,
+    };
+  }
+  return providers;
+}
+
+// Alias for backwards compatibility
+export const loadProviders = getProviders;
diff --git a/providers/shelley-proxy.js b/providers/shelley-proxy.js
new file mode 100644
index 0000000..f3b20ae
--- /dev/null
+++ b/providers/shelley-proxy.js
@@ -0,0 +1,96 @@
+/**
+ * shelley-proxy.js — Shelley/exe.dev proxy (classic schema + Exedev-Gateway-Cost)
+ *
+ * The Shelley proxy returns standard Anthropic rate-limit headers (classic schema,
+ * not the unified Teams schema) plus an Exedev-Gateway-Cost header with per-call
+ * USD cost. No API key is required — the proxy handles auth internally.
+ *
+ * Header reference:
+ *   Anthropic-Ratelimit-Tokens-Limit         total token budget
+ *   Anthropic-Ratelimit-Tokens-Remaining     remaining tokens
+ *   Anthropic-Ratelimit-Tokens-Reset         ISO 8601 reset time
+ *   Anthropic-Ratelimit-Requests-Limit       total request budget
+ *   Anthropic-Ratelimit-Requests-Remaining   remaining requests
+ *   Anthropic-Ratelimit-Requests-Reset       ISO 8601 reset time
+ *   Exedev-Gateway-Cost                      per-call USD cost (float)
+ *   anthropic-organization-id                organization UUID
+ */
+
+import { getSeverity } from '../report.js';
+
+/**
+ * Parse classic Anthropic rate-limit headers from a Shelley proxy response.
+ *
+ * @param {Object} headers — fetch Response.headers (or compatible mock with .get(name))
+ * @param {number} httpStatus — HTTP status code
+ * @returns {Object} normalized provider result
+ */
+export function parseShelleyHeaders(headers, httpStatus) {
+  const h = (name) => headers.get(name) || headers.get(name.toLowerCase());
+
+  const tokensLimit     = parseInt(h('Anthropic-Ratelimit-Tokens-Limit'), 10);
+  const tokensRemaining = parseInt(h('Anthropic-Ratelimit-Tokens-Remaining'), 10);
+  const tokensReset     = h('Anthropic-Ratelimit-Tokens-Reset');
+  const requestsLimit     = parseInt(h('Anthropic-Ratelimit-Requests-Limit'), 10);
+  const requestsRemaining = parseInt(h('Anthropic-Ratelimit-Requests-Remaining'), 10);
+  const requestsReset     = h('Anthropic-Ratelimit-Requests-Reset');
+  const costPerCall = h('Exedev-Gateway-Cost');
+  const orgId       = h('anthropic-organization-id');
+
+  const result = {
+    type: 'shelley-proxy',
+    status: httpStatus === 429 ? 'rate_limited' : (httpStatus === 200 ? 'ok' : 'error'),
+    tokens_limit:      isNaN(tokensLimit)      ? null : tokensLimit,
+    tokens_remaining:  isNaN(tokensRemaining)  ? null : tokensRemaining,
+    tokens_reset:      tokensReset             || null,
+    requests_limit:    isNaN(requestsLimit)    ? null : requestsLimit,
+    requests_remaining: isNaN(requestsRemaining) ? null : requestsRemaining,
+    requests_reset:    requestsReset           || null,
+    cost_per_call_usd: costPerCall ? parseFloat(costPerCall) : null,
+    organization_id:   orgId || null,
+  };
+
+  result.severity = getSeverity(result);
+  return result;
+}
+
+// Alias used in some internal tooling
+export const parseClassicHeaders = parseShelleyHeaders;
+
+/**
+ * Probe the Shelley proxy by making a minimal API call.
+ * @param {string} providerName
+ * @param {string} baseUrl
+ * @returns {Promise<Object>} normalized provider result
+ */
+export async function probeShelleyProxy(providerName, baseUrl) {
+  try {
+    const response = await fetch(`${baseUrl}/v1/messages`, {
+      method: 'POST',
+      headers: {
+        'x-api-key': 'not-needed',
+        'anthropic-version': '2023-06-01',
+        'content-type': 'application/json',
+      },
+      body: JSON.stringify({
+        model: 'claude-haiku-4-5-20251001',
+        max_tokens: 1,
+        messages: [{ role: 'user', content: 'Hi' }],
+      }),
+    });
+
+    return parseShelleyHeaders(response.headers, response.status);
+  } catch (err) {
+    return {
+      type: 'shelley-proxy',
+      status: 'error',
+      message: err.message,
+      tokens_limit: null,
+      tokens_remaining: null,
+      requests_limit: null,
+      requests_remaining: null,
+      cost_per_call_usd: null,
+      severity: 'unknown',
+    };
+  }
+}
diff --git a/report.js b/report.js
new file mode 100644
index 0000000..06d7897
--- /dev/null
+++ b/report.js
@@ -0,0 +1,128 @@
+/**
+ * report.js — human-readable summary generator + severity logic
+ */
+
+/**
+ * Compute severity for a parsed provider result.
+ * @param {Object} provider
+ * @returns {'critical'|'warning'|'ok'|'unknown'}
+ */
+export function getSeverity(provider) {
+  if (provider.type === 'teams-direct') {
+    if (provider.status === 'rejected') return 'critical';
+    if (provider.utilization_7d > 0.85) return 'warning';
+    if (provider.utilization_5h > 0.7) return 'warning';
+    return 'ok';
+  }
+  if (provider.type === 'shelley-proxy') {
+    const tokenPct = 1 - (provider.tokens_remaining / provider.tokens_limit);
+    if (tokenPct > 0.85) return 'warning';
+    return 'ok';
+  }
+  return 'unknown';
+}
+
+/**
+ * Format seconds as "Xh Ym" or "Xm" or "Xs".
+ */
+function formatDuration(seconds) {
+  if (seconds == null || isNaN(seconds) || seconds < 0) return '?';
+  const h = Math.floor(seconds / 3600);
+  const m = Math.floor((seconds % 3600) / 60);
+  const s = seconds % 60;
+  if (h > 0) return `${h}h ${m}m`;
+  if (m > 0) return `${m}m`;
+  return `${s}s`;
+}
+
+/**
+ * Format a float as a percentage string.
+ */
+function pct(v) {
+  if (v == null) return '?';
+  return `${Math.round(v * 100)}%`;
+}
+
+/**
+ * Severity badge string.
+ */
+function badge(severity) {
+  switch (severity) {
+    case 'critical': return '[CRITICAL]';
+    case 'warning':  return '[WARNING] ';
+    case 'ok':       return '[OK]      ';
+    default:         return '[UNKNOWN] ';
+  }
+}
+
+/**
+ * Generate a human-readable summary from a full monitor result.
+ * @param {Object} result — { timestamp, providers: { name: {...} } }
+ * @returns {string}
+ */
+export function generateReport(result) {
+  const ts = result.timestamp
+    ? result.timestamp.replace('T', ' ').replace(/\.\d+Z$/, ' UTC').replace('Z', ' UTC')
+    : new Date().toUTCString();
+
+  const lines = [];
+  const width = 60;
+
+  lines.push(`Token Monitor — ${ts}`);
+  lines.push('═'.repeat(width));
+  lines.push('');
+
+  const counts = { critical: 0, warning: 0, ok: 0, unknown: 0 };
+
+  for (const [name, p] of Object.entries(result.providers)) {
+    const sev = p.severity || getSeverity(p);
+    counts[sev] = (counts[sev] || 0) + 1;
+
+    const b = badge(sev);
+    let detail = '';
+
+    if (p.type === 'teams-direct') {
+      if (p.status === 'invalid_key') {
+        detail = 'Invalid API key (401)';
+      } else if (p.status === 'rejected') {
+        const resetIn = formatDuration(p.reset_in_seconds);
+        detail = `MAXED — 7d: ${pct(p.utilization_7d)} | resets in ${resetIn}`;
+      } else {
+        detail = `5h: ${pct(p.utilization_5h)} | 7d: ${pct(p.utilization_7d)}`;
+        if (p.reset_in_seconds != null) {
+          detail += ` | resets in ${formatDuration(p.reset_in_seconds)}`;
+        }
+      }
+    } else if (p.type === 'shelley-proxy') {
+      if (p.status === 'error') {
+        detail = `Error: ${p.message || 'unknown'}`;
+      } else {
+        detail = `tokens: ${p.tokens_remaining?.toLocaleString()}/${p.tokens_limit?.toLocaleString()}`;
+        if (p.cost_per_call_usd != null) {
+          detail += ` | cost: $${p.cost_per_call_usd}/call`;
+        }
+      }
+    } else if (p.type === 'api-direct') {
+      detail = p.message || 'No billing data available';
+    } else {
+      detail = p.message || '';
+    }
+
+    // Pad provider name to 14 chars
+    const paddedName = name.padEnd(14);
+    lines.push(`${paddedName}  ${b}  ${detail}`);
+  }
+
+  lines.push('');
+  lines.push('─'.repeat(width));
+
+  const parts = [];
+  if (counts.critical) parts.push(`${counts.critical} CRITICAL`);
+  if (counts.warning)  parts.push(`${counts.warning} WARNING`);
+  if (counts.ok)       parts.push(`${counts.ok} OK`);
+  if (counts.unknown)  parts.push(`${counts.unknown} UNKNOWN`);
+  lines.push(`Overall: ${parts.join(', ') || 'no providers'}`);
+  lines.push('');
+
+  return lines.join('\n');
+}
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..9b85ee3
--- /dev/null
+++ b/test.js
@@ -0,0 +1,335 @@
+/**
+ * token-monitor test suite
+ * Run: node test.js
+ * Red first, then implement until green.
+ */
+
+import { readFileSync, existsSync } from 'fs';
+import { homedir } from 'os';
+import { join } from 'path';
+import { execSync } from 'child_process';
+
+let passed = 0;
+let failed = 0;
+const failures = [];
+
+function assert(label, condition, detail = '') {
+  if (condition) {
+    console.log(`  ✓ ${label}`);
+    passed++;
+  } else {
+    console.log(`  ✗ ${label}${detail ? ': ' + detail : ''}`);
+    failed++;
+    failures.push({ label, detail });
+  }
+}
+
+function run(cmd) {
+  return execSync(cmd, { cwd: '/home/exedev/projects/token-monitor', encoding: 'utf-8' });
+}
+
+function runSafe(cmd) {
+  try {
+    return { stdout: run(cmd), code: 0 };
+  } catch (e) {
+    return { stdout: e.stdout || '', stderr: e.stderr || '', code: e.status };
+  }
+}
+
+// ── 1. Package structure ─────────────────────────────────────────────────────
+console.log('\n── 1. File structure ───────────────────────────────────────────');
+
+const root = '/home/exedev/projects/token-monitor';
+const files = [
+  'package.json',
+  'monitor.js',
+  'logger.js',
+  'report.js',
+  'providers/index.js',
+  'providers/anthropic-teams.js',
+  'providers/anthropic-api.js',
+  'providers/shelley-proxy.js',
+  'README.md',
+];
+for (const f of files) {
+  assert(`${f} exists`, existsSync(join(root, f)));
+}
+
+// ── 2. package.json shape ────────────────────────────────────────────────────
+console.log('\n── 2. package.json ─────────────────────────────────────────────');
+const pkg = JSON.parse(readFileSync(join(root, 'package.json'), 'utf-8'));
+assert('name = token-monitor', pkg.name === 'token-monitor');
+assert('type = module (ESM)', pkg.type === 'module');
+assert('no external dependencies', !pkg.dependencies || Object.keys(pkg.dependencies).length === 0);
+assert('engines.node >= 18', pkg.engines?.node?.includes('18') || pkg.engines?.node?.includes('>=18'));
+
+// ── 3. Severity logic (unit test, importable) ────────────────────────────────
+console.log('\n── 3. Severity logic ───────────────────────────────────────────');
+const { getSeverity } = await import('./report.js');
+
+assert('teams: rejected → critical',
+  getSeverity({ type: 'teams-direct', status: 'rejected', utilization_5h: 0, utilization_7d: 1.0 }) === 'critical');
+assert('teams: 7d > 0.85 → warning',
+  getSeverity({ type: 'teams-direct', status: 'allowed', utilization_5h: 0.2, utilization_7d: 0.9 }) === 'warning');
+assert('teams: 5h > 0.7 → warning',
+  getSeverity({ type: 'teams-direct', status: 'allowed', utilization_5h: 0.75, utilization_7d: 0.4 }) === 'warning');
+assert('teams: healthy → ok',
+  getSeverity({ type: 'teams-direct', status: 'allowed', utilization_5h: 0.3, utilization_7d: 0.4 }) === 'ok');
+assert('shelley: high token use → warning',
+  getSeverity({ type: 'shelley-proxy', tokens_remaining: 5000, tokens_limit: 50000 }) === 'warning');
+assert('shelley: healthy → ok',
+  getSeverity({ type: 'shelley-proxy', tokens_remaining: 45000, tokens_limit: 50000 }) === 'ok');
+assert('api-direct → unknown',
+  getSeverity({ type: 'api-direct' }) === 'unknown');
+
+// ── 4. Provider registry ─────────────────────────────────────────────────────
+console.log('\n── 4. Provider registry ────────────────────────────────────────');
+const { getProviders } = await import('./providers/index.js');
+const providers = getProviders();
+const names = Object.keys(providers);
+assert('team-vigilio in registry', names.includes('team-vigilio'));
+assert('team-molto in registry', names.includes('team-molto'));
+assert('team-nadja in registry', names.includes('team-nadja'));
+assert('team-ludo in registry', names.includes('team-ludo'));
+assert('team-buio in registry', names.includes('team-buio'));
+assert('shelley-proxy in registry', names.includes('shelley-proxy'));
+assert('api-ateam in registry', names.includes('api-ateam'));
+assert('zai NOT in registry (not anthropic-messages)', !names.includes('zai'));
+for (const [name, p] of Object.entries(providers)) {
+  assert(`${name} has baseUrl`, typeof p.baseUrl === 'string' && p.baseUrl.length > 0);
+  assert(`${name} has type`, ['teams-direct', 'shelley-proxy', 'api-direct'].includes(p.type));
+}
+
+// ── 5. Teams header parser ───────────────────────────────────────────────────
+console.log('\n── 5. Teams header parser ──────────────────────────────────────');
+const { parseTeamsHeaders } = await import('./providers/anthropic-teams.js');
+
+// Simulate a 200 OK response with unified headers
+const ok200headers = new Map([
+  ['anthropic-ratelimit-unified-status', 'allowed'],
+  ['anthropic-ratelimit-unified-5h-status', 'allowed'],
+  ['anthropic-ratelimit-unified-5h-utilization', '0.32'],
+  ['anthropic-ratelimit-unified-5h-reset', '1775336400'],
+  ['anthropic-ratelimit-unified-7d-status', 'allowed'],
+  ['anthropic-ratelimit-unified-7d-utilization', '0.45'],
+  ['anthropic-ratelimit-unified-7d-reset', '1775869200'],
+  ['anthropic-ratelimit-unified-representative-claim', 'five_hour'],
+  ['anthropic-ratelimit-unified-fallback-percentage', '0.5'],
+  ['anthropic-ratelimit-unified-reset', '1775336400'],
+  ['anthropic-ratelimit-unified-overage-status', 'rejected'],
+  ['anthropic-ratelimit-unified-overage-disabled-reason', 'org_level_disabled'],
+  ['anthropic-organization-id', '1d7653ad-11d9-4029-ba1a-a2dd4cd0b2f3'],
+]);
+const fakeHeaders200 = { get: (k) => ok200headers.get(k.toLowerCase()) || null };
+const parsed200 = parseTeamsHeaders(fakeHeaders200, 200, 'team-test');
+assert('200: type = teams-direct', parsed200.type === 'teams-direct');
+assert('200: status = allowed', parsed200.status === 'allowed');
+assert('200: utilization_5h is number', typeof parsed200.utilization_5h === 'number');
+assert('200: utilization_5h = 0.32', parsed200.utilization_5h === 0.32);
+assert('200: utilization_7d = 0.45', parsed200.utilization_7d === 0.45);
+assert('200: representative_claim present', parsed200.representative_claim === 'five_hour');
+assert('200: reset_timestamp is number', typeof parsed200.reset_timestamp === 'number');
+assert('200: reset_in_seconds is number', typeof parsed200.reset_in_seconds === 'number');
+assert('200: organization_id present', parsed200.organization_id === '1d7653ad-11d9-4029-ba1a-a2dd4cd0b2f3');
+assert('200: severity = ok', parsed200.severity === 'ok');
+
+// Simulate 429 with rejected status
+const rejected429headers = new Map([
+  ['anthropic-ratelimit-unified-status', 'rejected'],
+  ['anthropic-ratelimit-unified-5h-status', 'allowed'],
+  ['anthropic-ratelimit-unified-5h-utilization', '0.0'],
+  ['anthropic-ratelimit-unified-5h-reset', '1775322000'],
+  ['anthropic-ratelimit-unified-7d-status', 'rejected'],
+  ['anthropic-ratelimit-unified-7d-utilization', '1.0'],
+  ['anthropic-ratelimit-unified-7d-surpassed-threshold', '1.0'],
+  ['anthropic-ratelimit-unified-7d-reset', '1775404800'],
+  ['anthropic-ratelimit-unified-representative-claim', 'seven_day'],
+  ['anthropic-ratelimit-unified-fallback-percentage', '0.5'],
+  ['anthropic-ratelimit-unified-reset', '1775404800'],
+  ['anthropic-ratelimit-unified-overage-status', 'rejected'],
+  ['anthropic-ratelimit-unified-overage-disabled-reason', 'org_level_disabled'],
+  ['anthropic-organization-id', '1d7653ad-11d9-4029-ba1a-a2dd4cd0b2f3'],
+  ['retry-after', '83690'],
+]);
+const fakeHeaders429 = { get: (k) => rejected429headers.get(k.toLowerCase()) || null };
+const parsed429 = parseTeamsHeaders(fakeHeaders429, 429, 'team-vigilio');
+assert('429: status = rejected', parsed429.status === 'rejected');
+assert('429: utilization_7d = 1.0', parsed429.utilization_7d === 1.0);
+assert('429: severity = critical', parsed429.severity === 'critical');
+assert('429: retry_after_seconds = 83690', parsed429.retry_after_seconds === 83690);
+
+// 401 invalid key
+const { parseTeamsHeaders: ph } = await import('./providers/anthropic-teams.js');
+const parsed401 = ph({ get: () => null }, 401, 'team-ludo');
+assert('401: status = invalid_key', parsed401.status === 'invalid_key');
+assert('401: utilization_5h = null', parsed401.utilization_5h === null);
+assert('401: utilization_7d = null', parsed401.utilization_7d === null);
+assert('401: severity = unknown', parsed401.severity === 'unknown');
+
+// ── 6. Shelley header parser ─────────────────────────────────────────────────
+console.log('\n── 6. Shelley header parser ────────────────────────────────────');
+const { parseShelleyHeaders } = await import('./providers/shelley-proxy.js');
+
+const shelleyHeaderMap = new Map([
+  ['anthropic-ratelimit-tokens-limit', '4800000'],
+  ['anthropic-ratelimit-tokens-remaining', '4750000'],
+  ['anthropic-ratelimit-tokens-reset', '2026-04-04T13:00:00Z'],
+  ['anthropic-ratelimit-requests-limit', '20000'],
+  ['anthropic-ratelimit-requests-remaining', '19999'],
+  ['anthropic-ratelimit-requests-reset', '2026-04-04T16:45:09Z'],
+  ['exedev-gateway-cost', '0.000013'],
+]);
+const fakeShelleyHeaders = { get: (k) => shelleyHeaderMap.get(k.toLowerCase()) || null };
+const parsedShelley = parseShelleyHeaders(fakeShelleyHeaders, 200);
+assert('shelley: type = shelley-proxy', parsedShelley.type === 'shelley-proxy');
+assert('shelley: status = ok', parsedShelley.status === 'ok');
+assert('shelley: tokens_limit = 4800000', parsedShelley.tokens_limit === 4800000);
+assert('shelley: tokens_remaining = 4750000', parsedShelley.tokens_remaining === 4750000);
+assert('shelley: tokens_reset present', typeof parsedShelley.tokens_reset === 'string');
+assert('shelley: requests_limit = 20000', parsedShelley.requests_limit === 20000);
+assert('shelley: requests_remaining = 19999', parsedShelley.requests_remaining === 19999);
+assert('shelley: cost_per_call_usd = 0.000013', parsedShelley.cost_per_call_usd === 0.000013);
+assert('shelley: severity = ok', parsedShelley.severity === 'ok');
+
+// ── 7. api-ateam provider ────────────────────────────────────────────────────
+console.log('\n── 7. api-ateam (no billing data) ──────────────────────────────');
+const { getApiAteamStatus } = await import('./providers/anthropic-api.js');
+const apiStatus = getApiAteamStatus();
+assert('api-ateam: type = api-direct', apiStatus.type === 'api-direct');
+assert('api-ateam: status = no_billing_data', apiStatus.status === 'no_billing_data');
+assert('api-ateam: message is string', typeof apiStatus.message === 'string' && apiStatus.message.length > 0);
+assert('api-ateam: severity = unknown', apiStatus.severity === 'unknown');
+
+// ── 8. Logger ────────────────────────────────────────────────────────────────
+console.log('\n── 8. Logger ───────────────────────────────────────────────────');
+const { logRun } = await import('./logger.js');
+const testData = { test: true, value: 42, providers: {} };
+logRun(testData);
+const today = new Date().toISOString().slice(0, 10);
+const logFile = join(homedir(), '.logs', 'token-monitor', `${today}.jsonl`);
+assert('log file created', existsSync(logFile));
+const lastLine = readFileSync(logFile, 'utf-8').trim().split('\n').pop();
+const logEntry = JSON.parse(lastLine);
+assert('log entry has ts', typeof logEntry.ts === 'string');
+assert('log entry has test data', logEntry.test === true && logEntry.value === 42);
+
+// ── 9. Report generator ──────────────────────────────────────────────────────
+console.log('\n── 9. Report generator ─────────────────────────────────────────');
+const { generateReport } = await import('./report.js');
+const sampleResult = {
+  timestamp: '2026-04-04T12:00:00Z',
+  providers: {
+    'team-vigilio': {
+      type: 'teams-direct', status: 'rejected',
+      utilization_5h: 0.0, utilization_7d: 1.0,
+      representative_claim: 'seven_day',
+      reset_timestamp: Math.floor(Date.now() / 1000) + 82800,
+      reset_in_seconds: 82800,
+      severity: 'critical',
+    },
+    'team-molto': {
+      type: 'teams-direct', status: 'allowed',
+      utilization_5h: 0.32, utilization_7d: 0.45,
+      representative_claim: 'five_hour',
+      reset_timestamp: Math.floor(Date.now() / 1000) + 3600,
+      reset_in_seconds: 3600,
+      severity: 'ok',
+    },
+    'team-ludo': {
+      type: 'teams-direct', status: 'invalid_key',
+      utilization_5h: null, utilization_7d: null,
+      severity: 'unknown',
+    },
+    'shelley-proxy': {
+      type: 'shelley-proxy', status: 'ok',
+      tokens_remaining: 45000, tokens_limit: 50000,
+      requests_remaining: 48, requests_limit: 50,
+      tokens_reset: '2026-04-04T13:00:00Z',
+      cost_per_call_usd: 0.000013,
+      severity: 'ok',
+    },
+    'api-ateam': {
+      type: 'api-direct', status: 'no_billing_data',
+      message: 'Anthropic API does not expose billing/quota via REST',
+      severity: 'unknown',
+    },
+  },
+};
+const report = generateReport(sampleResult);
+assert('report is string', typeof report === 'string');
+assert('report contains Token Monitor header', report.includes('Token Monitor'));
+assert('report contains team-vigilio', report.includes('team-vigilio'));
+assert('report contains CRITICAL', report.includes('CRITICAL'));
+assert('report contains team-molto', report.includes('team-molto'));
+assert('report contains shelley-proxy', report.includes('shelley-proxy'));
+assert('report contains api-ateam', report.includes('api-ateam'));
+assert('report contains Overall summary', report.toLowerCase().includes('overall'));
+
+// ── 10. CLI: --summary flag ──────────────────────────────────────────────────
+console.log('\n── 10. CLI flags (--summary, --json) ───────────────────────────');
+// --summary: exit 0, stdout contains provider names
+const summaryResult = runSafe('node monitor.js --summary');
+assert('--summary exits 0', summaryResult.code === 0, `exit code: ${summaryResult.code}\n${summaryResult.stderr || ''}`);
+assert('--summary output contains Token Monitor', summaryResult.stdout.includes('Token Monitor'));
+assert('--summary output contains provider names', summaryResult.stdout.includes('team-') || summaryResult.stdout.includes('shelley'));
+
+// --json: exit 0, valid JSON, correct schema
+const jsonResult = runSafe('node monitor.js --json');
+assert('--json exits 0', jsonResult.code === 0, `exit code: ${jsonResult.code}\n${jsonResult.stderr || ''}`);
+let jsonData;
+try {
+  jsonData = JSON.parse(jsonResult.stdout);
+  assert('--json outputs valid JSON', true);
+} catch (e) {
+  assert('--json outputs valid JSON', false, e.message);
+}
+if (jsonData) {
+  assert('JSON has timestamp', typeof jsonData.timestamp === 'string');
+  assert('JSON has providers object', typeof jsonData.providers === 'object');
+  const pnames = Object.keys(jsonData.providers);
+  assert('JSON providers includes team-vigilio', pnames.includes('team-vigilio'));
+  assert('JSON providers includes shelley-proxy', pnames.includes('shelley-proxy'));
+  assert('JSON providers includes api-ateam', pnames.includes('api-ateam'));
+
+  // Teams-direct entries must have required fields
+  for (const [name, p] of Object.entries(jsonData.providers)) {
+    if (p.type === 'teams-direct' && p.status !== 'invalid_key') {
+      assert(`${name}: has utilization_5h`, typeof p.utilization_5h === 'number');
+      assert(`${name}: has utilization_7d`, typeof p.utilization_7d === 'number');
+      assert(`${name}: has severity`, typeof p.severity === 'string');
+      assert(`${name}: has reset_in_seconds`, typeof p.reset_in_seconds === 'number');
+    }
+    if (p.type === 'shelley-proxy') {
+      assert('shelley-proxy: has cost_per_call_usd', typeof p.cost_per_call_usd === 'number');
+      assert('shelley-proxy: has tokens_remaining', typeof p.tokens_remaining === 'number');
+      assert('shelley-proxy: has tokens_limit', typeof p.tokens_limit === 'number');
+    }
+    if (p.type === 'api-direct') {
+      assert('api-ateam: status = no_billing_data', p.status === 'no_billing_data');
+    }
+  }
+}
+
+// Default run: exit 0, log file updated
+const defaultResult = runSafe('node monitor.js');
+assert('default run exits 0', defaultResult.code === 0, `exit code: ${defaultResult.code}\n${defaultResult.stderr || ''}`);
+
+// Log file should exist and have content
+const logFileAfter = join(homedir(), '.logs', 'token-monitor', `${today}.jsonl`);
+assert('log file exists after default run', existsSync(logFileAfter));
+const logLines = readFileSync(logFileAfter, 'utf-8').trim().split('\n');
+assert('log file has at least 2 entries', logLines.length >= 2);
+
+// ── Results ──────────────────────────────────────────────────────────────────
+console.log('\n' + '═'.repeat(50));
+console.log(`Tests: ${passed + failed} | Passed: ${passed} | Failed: ${failed}`);
+if (failures.length > 0) {
+  console.log('\nFailed:');
+  for (const f of failures) {
+    console.log(`  ✗ ${f.label}${f.detail ? ' — ' + f.detail : ''}`);
+  }
+  process.exit(1);
+} else {
+  console.log('\nAll tests pass. ✓');
+  process.exit(0);
+}