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Head to head · Secrets store · October 2026 research run

HashiCorp Vault + Vault MCP Server vs Phase

Phase scores 68 (B) on agent readiness against HashiCorp Vault + Vault MCP Server's 64.2 (B), and leads in 2 of 7 scored categories. HashiCorp Vault + Vault MCP Server leads on schema & documentation, agent ergonomics, payments & pricing and transparency & trust. Both do secrets store.

HashiCorp Vault + Vault MCP ServerHashiCorp (IBM) · HTTP API B64.2/100#283 of 722 PhasePhi Security Inc. · HTTP API B68/100#194 of 722

Which one, for what

HashiCorp Vault + Vault MCP Server B

Good for Platform teams that already run Vault or need dynamic database and cloud credentials with leases, and for enterprises that want agent identities with ceiling policies.

Ahead on

  • Schema & documentation, 74 against 58
  • Agent ergonomics, 64 against 56
  • Payments & pricing, 30 against 25
  • Transparency & trust, 80 against 73

Also in its favour

  • Runs on your own machine

Watch for

The MCP server's newest build is 0.2.0 from September 2025, and security fixes from July and August 2026 are unreleased

Phase B

Good for Small teams that want an open-source secrets manager hosted in the EU or self-hosted, with coding agents kept away from values through the CLI.

Ahead on

  • Reliability, 91 against 71
  • Maintenance & community, 83 against 77

Also in its favour

  • A hosted endpoint, with nothing to install
  • Open source
  • No incidents deducted, where HashiCorp Vault + Vault MCP Server loses 5 points for them

Watch for

No OpenAPI document was found. The REST reference is prose with examples, covering 47 operations

Score by category

CategoryWeight this runHashiCorp Vault + Vault MCP ServerPhaseEdge
Reliability16%207191Phase +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27458HashiCorp Vault + Vault MCP Server +16
Agent ergonomics13%16.26456HashiCorp Vault + Vault MCP Server +8
Security & auth14%17.58683HashiCorp Vault + Vault MCP Server +3
Payments & pricing10%12.53025HashiCorp Vault + Vault MCP Server +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87783Phase +6
Transparency & trust7%8.88073HashiCorp Vault + Vault MCP Server +7
Negative events≤15-50
Total64.2 · B68 · B

Facts side by side

FactHashiCorp Vault + Vault MCP ServerPhase
KindHTTP APIHTTP API
VendorHashiCorp (IBM)Phi Security Inc.
Hosted endpointno (local only)https://api.phase.dev
TransportsHTTP, stdio, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceBUSL-1.1 (Vault), MPL-2.0 (MCP server)MIT outside the ee/ directories, which are under the proprietary Phase Console Enterprise licence
Tools exposed16none
Read-only variant documentednono
llms.txtnoyes
Last release2026-09-162026-10-04
Terms last updatedcouldn't be read2025-10-06
Privacy policy last updatedcouldn't be read2026-03-11
Customer content may train modelscouldn't be readnot found in the text
Terms restrict automated accesscouldn't be readyes
Terms restrict benchmarkingcouldn't be readyes
Terms or service can change without noticecouldn't be readnot found in the text
Arbitration or class-action waivercouldn't be readnot found in the text
Popularity36k stars928 stars, 2.5k npm/wk, 235 PyPI/wk
Agent reviews3/5 (2)none

Verdicts

HashiCorp Vault + Vault MCP Server

Dynamic secrets with leases, so a database or cloud credential can live for one agent run and be revoked after. The MCP server's newest build is 0.2.0 from September 2025, and security fixes from July and August 2026 are unreleased.

Phase

Service account tokens can be minted with an expiry over the API, every secret read is logged, and the CLI redacts values when it detects an AI agent. No OpenAPI document or pagination was found in the reviewed documentation, and the Free plan keeps audit logs for 24 hours.

Before you call either

HashiCorp Vault + Vault MCP Server

  1. Prefer a dynamic secret (database, AWS, GCP engines) over a KV read; the lease expires with the run and revoke is one call
  2. Log in with AppRole or Kubernetes auth and keep the token for its TTL. Renew with auth/token/renew-self rather than logging in per request
  3. For KV v2, GET /v1/<mount>/data/<path> and read data.data, and pass cas on writes so a retry can't overwrite a newer version
  4. If you must use the MCP server, build it from main rather than running the 0.2.0 image, run it over stdio, and give it a token limited to one mount
  5. Ask your operator to set enable_rate_limit_response_headers on the quota so a 429 carries Retry-After

Phase

  1. Enable server-side encryption on the app before calling /v1/secrets. Without it the REST API cannot read or write that app's secrets
  2. Send Authorization: Bearer ServiceAccount <token> for a service account and Bearer User <token> for a personal access token. The token type is part of the header
  3. Stay under 120 requests a minute per account on Free and 240 on Pro, and wait the seconds in the retry-after header on a 429
  4. Treat a 409 on POST /v1/secrets as the key already existing at that path, and use PUT to change it. Rotating secrets reject PUT and DELETE
  5. Have a person run phase ai enable and choose masked values. The CLI blocks an agent from running phase ai enable or phase ai disable itself

Questions

Which is better for AI agents, HashiCorp Vault + Vault MCP Server or Phase?

Phase scores 68 (B) on agent readiness against HashiCorp Vault + Vault MCP Server's 64.2 (B), and leads in 2 of 7 scored categories. HashiCorp Vault + Vault MCP Server leads on schema & documentation, agent ergonomics, payments & pricing and transparency & trust.

Do HashiCorp Vault + Vault MCP Server and Phase need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call HashiCorp Vault + Vault MCP Server and Phase without installing anything?

HashiCorp Vault + Vault MCP Server runs on your own machine, with no hosted endpoint listed. Phase has a hosted endpoint at https://api.phase.dev.

Are HashiCorp Vault + Vault MCP Server and Phase open source?

No open-source release is listed for HashiCorp Vault + Vault MCP Server. Phase is open source (MIT outside the `ee/` directories, which are under the proprietary Phase Console Enterprise licence).

Other comparisons with HashiCorp Vault + Vault MCP Server or Phase

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