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gam-seller-mcp-node MCP Server

Governed, read-only MCP server exposing Google Ad Manager inventory discovery to buyer agents

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled gam-seller-mcp-node yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as gam-seller-mcp-node on npm. Runs locally.

Known issues

19 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

README security section should state the hash-chain attribution boundary (ADR-4)

hashEntry covers { seq, event_class, payload, prev_hash, timestamp } (src/audit/event.ts:54) and deliberately excludes the top-level buyer_id / request_id (ADR-4 decision B, event.ts:43-45). This is a sound tradeoff — it lets crypto-shred (Art. 17) anonymize entries without breaking the chain — but the README's "every decision audited / hash-chained" reads as if attribution is tamper-evident. Reattribution of an entry's top-level actor is not covered by the chain (the pseudonym

Read the thread · 2026-08-10 · closed · 2 comments

Add JSDoc to public-facing types in catalog/store.ts and pricing/store.ts

What to do

Add JSDoc comments to the exported interfaces and types that buyer agents and publisher operators interact with:

Example

/** A coarse product family visible to an entitled buyer agent.
 *  Raw inventory IDs, deal IDs, and exact floor prices are never included.
 */

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/10) · 2026-07-22 · open · 2 comments

### RFC: Bucket thresholds — define what Low / Mid / High means in impression terms

## Background

\`get_forecast\` returns one of three buckets: \`low\`, \`mid\`, \`high\`. The current implementation is synthetic and deterministic. When the real GAM ForecastService adapter lands (#4), the engine will need to map actual impression forecasts to these three values.

The thresholds are not yet defined. This issue is the place to discuss and ratify them.

## Questions

**Absolute vs relative thresholds?**
- Absolute: \`low < 100k impressions\`, \`mid = 100k–1M\`, \`high > 1M\`
- Re

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/12) · 2026-07-22 · closed · 1 comment

### Production transport: TLS termination, bind posture, and single-instance limitation

## Problem

The HTTP transport binds loopback and expects a reverse proxy to terminate TLS; there is no in-process TLS. And the rate limiter, replay guard, and intent store are in-memory per process, so the node is **single-instance** — scaling out would split that state.

**Anchor:** `docs/PUBLISHER-DEPLOYMENT.md` (reverse-proxy + single-instance notes) and `src/http.ts` (bind).

## Impact

A publisher deploying without a correctly configured TLS-terminating proxy exposes plaintext; a publisher

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/86) · 2026-08-18 · open · 0 comments

### Head-hash anchor is a local rewritable file — move to external WORM / Object Lock for production

## Problem

The tamper-evidence guarantee assumes the head-hash anchor lives in an **append-only external** store. Today it is written to a local file with a rewritable `writeFileSync`.

**Anchor:** `src/audit/anchor.ts` — the code comment itself notes: *"Production: use cloud-immutable write instead (never overwrite)."*

## Impact

An adversary who can rewrite the local ledger can also rewrite the local anchor alongside it, defeating the "tamper with the local file alone isn't enough" property.

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/85) · 2026-08-18 · open · 0 comments

### Most recent

### issue-buyer-token.ts leaves an un-anchored ledger → server fail-closes on next startup (no_anchor_but_non_empty_ledger)

## Summary

Minting a buyer token with the documented CLI (`scripts/issue-buyer-token.ts`) on a fresh state writes a `TOKEN_ISSUANCE` event to the persistent audit ledger but never anchors the head. The **next server startup then aborts fail-closed**:

Fatal: [audit] FATAL: ledger integrity check failed on startup (no_anchor_but_non_empty_ledger) — refusing to serve requests with a suspect chain. Investigate the ledger and anchor before restarting.


So the node won't start after followin

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/73) · 2026-08-12 · closed · 0 comments

### Add a structural test that every authenticated tool routes through policy (scope gate)

`resolveScope()` (the policy/allowlist gate) is invoked **manually inside each authenticated handler** (`src/server.ts:228, 290, 354, 442`), not enforced by the tool-registration path. The README states *"Adding a new tool in the future cannot bypass this"* (`README.md:218`), but there is no wrapper and no test that enforces it: a new `server.tool(...)` that omits the `authenticate` / `resolveScope` calls would bypass policy silently.

All 5 current surfaces are correctly gated — `well_known_cap

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/67) · 2026-08-10 · closed · 0 comments

### Persistence-health surfacing (v0.6 E1) only covers the ledger; extend to the other 4 stores + /health

**Tier:** 1–2 (integrity / observability)

**Use case**
v0.6 added a persistence-health flag to `AuditLedger` (`isPersistenceHealthy()`, `src/audit/ledger.ts`) and surfaced it through `GET /health` (v0.8, `status:"degraded"`). But the other four disk-backed stores still **swallow write failures** as a benign `WARNING`:

- `src/audit/pseudonym.ts`
- `src/audit/anchor.ts`
- `src/audit/retention.ts`
- `src/identity/denylist.ts`

(all matched by `grep -rn "could not persist" src/`).

**Why it matter

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/51) · 2026-07-30 · closed · 0 comments

### Intent store is in-memory only: committed intents are lost on restart

**Tier:** 1 (durability of a core surface)

**Describe the bug**
`IntentStore` holds intents in a plain in-memory `Map` with no persistence (`src/intent/store.ts:45` — `private readonly byId = new Map(...)`, no `persistPath`), unlike the ledger (`src/audit/ledger.ts`) and denylist (`src/identity/denylist.ts`) which are file-backed. So a node restart drops all live intents.

This was acceptable in v0.5 (create-only, no read/revoke surface). It stopped being acceptable in **v0.7**, which added `re

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/50) · 2026-07-30 · closed · 0 comments

### Add integration test: pricing_options absent when valid_until has expired

## Context

\`PricingStore.priceFor()\` returns \`undefined\` for expired prices (fail-closed). This is unit-tested in \`tests/pricing.test.ts\`. However, the end-to-end buyer-agent session test (\`tests/buyer-agent-session.test.ts\`) only covers the happy path (valid price → \`pricing_options\` present).

## What to add

A new \`it()\` block in \`tests/buyer-agent-session.test.ts\` or \`tests/server.test.ts\` that:

1. Builds a server with a \`PricingStore\` configured with an **already-expired

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/11) · 2026-07-22 · closed · 0 comments

### OpenRTB 3.0 product taxonomy: align family_id scheme with IAB standards

## Context

Currently, \`family_id\` values are publisher-defined free-form strings (\`"display-ros"\`, \`"video-pre-roll"\`). A buyer agent connecting to multiple seller nodes has no way to know that \`"display-ros"\` at Publisher A is the same product type as \`"display-banner"\` at Publisher B.

Aligning \`family_id\` with the [OpenRTB 3.0](https://iabtechlab.com/standards/openrtb/) / [AdCOM](https://iabtechlab.com/standards/adcom/) taxonomy would make family IDs interoperable across publishe

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/9) · 2026-07-22 · open · 0 comments

### Prometheus metrics endpoint: observability for production deployments

## Context

In a production deployment, operators need to monitor:
- Request rates per buyer and per tool
- Auth failure rates (spike = probing or misconfigured buyer)
- Rate-limit hit frequency
- Audit ledger size and last anchor time
- Forecast bucket distribution (to detect synthetic vs real data divergence)

Currently, none of this is observable without reading the audit ledger files directly.

## Proposed endpoint

A scrape-friendly Prometheus metrics endpoint at \`/metrics\` (not exposed t

[Read the thread](https://github.com/juan-sibbo/gam-seller-mcp-node/issues/8) · 2026-07-22 · closed · 0 comments

[See all 16 reports Pod holds for gam-seller-mcp-node](/mcp/gam-seller-mcp-node/issues) — of 19 qualified upstream.

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