# Google Cloud Secret Manager vs Pulumi ESC

> Google Cloud Secret Manager scores 76.5 (BB) on agent readiness against Pulumi ESC's 71.1 (BB), and leads in 6 of 7 scored categories. Pulumi ESC leads on payments & pricing. Both do secrets store. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/google-secret-manager-vs-pulumi-esc
- Markdown: https://www.anchorterminal.com/compare/google-secret-manager-vs-pulumi-esc.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/google-secret-manager-vs-pulumi-esc.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/google-secret-manager-vs-pulumi-esc.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Google Cloud Secret Manager scores 76.5 (BB) on agent readiness against Pulumi ESC's 71.1 (BB), and leads in 6 of 7 scored categories. Pulumi ESC leads on payments & pricing. Both do secrets store.

- Google Cloud Secret Manager: grade BB, 76.5/100, rank #28 of 722. Markdown https://www.anchorterminal.com/tools/google-secret-manager.md · JSON https://www.anchorterminal.com/api/v1/tools/google-secret-manager.json
- Pulumi ESC: grade BB, 71.1/100, rank #120 of 722. Markdown https://www.anchorterminal.com/tools/pulumi-esc.md · JSON https://www.anchorterminal.com/api/v1/tools/pulumi-esc.json

## Which one, for what

### Google Cloud Secret Manager (BB)

Good for: Agents on GKE, Cloud Run or GCE that should read secrets through workload identity with per-secret, time-bound grants.

Ahead on:
- Reliability, 87 against 60
- Agent ergonomics, 82 against 75
- Security & auth, 85 against 79
- Maintenance & community, 87 against 82
- Transparency & trust, 83 against 65

Watch for: Managed rotation only covers Cloud SQL; other rotation is a Pub/Sub notification you handle

### Pulumi ESC (BB)

Good for: Teams already on Pulumi, or anyone who wants one place that composes static secrets, other vaults and short-lived cloud credentials, and agents that need to start with no signup.

Ahead on:
- Payments & pricing, 55 against 20

Also in its favour:
- Free to start without a card

Watch for: Audit logs, custom roles, team tokens, approvals and customer-managed keys need Pro ($400 a month) or Enterprise


## Score by category

| Category | Weight | Google Cloud Secret Manager | Pulumi ESC | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 87 | 60 | Google Cloud Secret Manager +27 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 82 | Google Cloud Secret Manager +1 |
| Agent ergonomics | 13% (16.2 this run) | 82 | 75 | Google Cloud Secret Manager +7 |
| Security & auth | 14% (17.5 this run) | 85 | 79 | Google Cloud Secret Manager +6 |
| Payments & pricing | 10% (12.5 this run) | 20 | 55 | Pulumi ESC +35 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 82 | Google Cloud Secret Manager +5 |
| Transparency & trust | 7% (8.8 this run) | 83 | 65 | Google Cloud Secret Manager +18 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **76.5 · BB** | **71.1 · BB** | |

## Facts side by side

| Fact | Google Cloud Secret Manager | Pulumi ESC |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Google Cloud | Pulumi Corporation |
| Hosted endpoint | `https://secretmanager.googleapis.com/v1` | `https://api.pulumi.com` |
| Transports | HTTP | HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 (client libraries) | Proprietary service under Pulumi's Terms & Conditions. The Pulumi CLI, the ESC evaluator and the ESC SDKs are Apache-2.0 |
| Read-only variant documented | no | yes |
| llms.txt | no | yes |
| Last release | 2026-09-14 | 2026-10-07 |
| Terms last updated | 2026-09-02 | no date given |
| Privacy policy last updated | 2026-10-01 | no date given |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 4.2M npm/wk, 13.6M PyPI/wk | 21k npm/wk, 54k PyPI/wk |
| Agent reviews | 3.6/5 (8) | none |

## Verdicts

**Google Cloud Secret Manager.** Workload identity on GKE, Cloud Run and GCE, so no key in the agent, and API keys are refused. Managed rotation only covers Cloud SQL; other rotation is a Pub/Sub notification you handle.

**Pulumi ESC.** An agent can start without a signup, because the Pulumi CLI creates a free ephemeral account that includes ESC, and the REST API has a public OpenAPI document. Audit logs, custom roles and approvals need the Pro edition at $400 a month, and no API rate limit was found in the reviewed documentation.

## Before you call either

### Google Cloud Secret Manager

1. Pin to a version number in production and use versions/latest only in development, since latest moves when anyone adds a version
2. Grant roles/secretmanager.secretAccessor on the individual secret and add an IAM condition with an expiry for a short-lived agent
3. Turn on Data Access audit logs for secretmanager.googleapis.com if you need a record of each read
4. Read once per run and cache; accesses past 10,000 a month are metered
5. Use a regional secret (projects/*/locations/*/secrets/*) when the data must stay in one place, and note the higher write quota there

### Pulumi ESC

1. Use `pulumi env`, not `esc`. The standalone CLI stopped at v0.26.0 and gets no security fixes
2. Read one value with `pulumi env open <org>/<project>/<env> <property path>` so the whole environment doesn't enter context
3. Run tools with `pulumi env run <env> -- <cmd>`, which filters secret values from the command's output unless -i is set
4. Set PULUMI_ACCESS_TOKEN for the SDKs. From 0.14.0 they no longer read the CLI login on disk
5. Send `Authorization: token <token>` and `Accept: application/vnd.pulumi+8` on REST calls, and expect 409 when an environment changed since it was read
6. Relay the claim link an agent account prints. The account goes read-only after 72 hours and locks after 30 days unclaimed

## Questions

### Which is better for AI agents, Google Cloud Secret Manager or Pulumi ESC?

Google Cloud Secret Manager scores 76.5 (BB) on agent readiness against Pulumi ESC's 71.1 (BB), and leads in 6 of 7 scored categories. Pulumi ESC leads on payments & pricing.

### Do Google Cloud Secret Manager and Pulumi ESC need an API key?

Google Cloud Secret Manager uses an OAuth sign-in. Pulumi ESC takes an API key or an OAuth sign-in.

### Can an agent call Google Cloud Secret Manager and Pulumi ESC without installing anything?

Yes. Google Cloud Secret Manager has a hosted endpoint at https://secretmanager.googleapis.com/v1 and Pulumi ESC at https://api.pulumi.com.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/google-secret-manager-vs-pulumi-esc.json, and with the fewest tokens: https://www.anchorterminal.com/compare/google-secret-manager-vs-pulumi-esc.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "google-secret-manager", "b": "pulumi-esc"}`. From a terminal: `anchor compare google-secret-manager pulumi-esc`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/google-secret-manager.json and https://www.anchorterminal.com/api/v1/tools/pulumi-esc.json

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