MCP Tool Reference Medium Risk

write_secret

Write a secret to a KV mount

Part of the HashiCorp Vault MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

hashicorp/vault-mcp-server Write

WHEN AI AGENTS USE THIS TOOL

AI agents use write_secret to create or modify resources in HashiCorp Vault. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

WHY ENFORCE A POLICY ON WRITE_SECRET

Without a policy, an AI agent could call write_secret repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach HashiCorp Vault.

RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

hashicorp-vault.yaml 
tools:
  write_secret:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full HashiCorp Vault policy for all 20 tools.

DETAILS

Tool Name

write_secret

Category

Write

MCP Server

HashiCorp Vault MCP Server

Risk Level

Medium

MORE HASHICORP VAULT TOOLS

create_mount Write
Create a new mount in Vault
enable_pki Write
Enable and configure a PKI secrets engine
create_pki_issuer Write
Create a new PKI issuer
create_pki_role Write
Create a new PKI role for issuing certificates
issue_pki_certificate Write
Issue a new certificate using a PKI role
list_mounts Read
List all mounts in Vault
list_secrets Read
List secrets in a KV mount under a specific path
read_secret Read
Read a secret from a KV mount

View all 20 tools →

SIMILAR WRITE TOOLS ON OTHER SERVERS

create_table Airtable
Create a new table with fields
update_table Airtable
Update a table's name or description
create_field Airtable
Add a new field to a table
update_field Airtable
Modify an existing field
create_record Airtable
Add a new record
update_record Airtable
Modify an existing record

RELATED READING

FREQUENTLY ASKED QUESTIONS

What does the write_secret tool do?

Write a secret to a KV mount. It is categorised as a Write tool in the HashiCorp Vault MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_secret?

Add a rule in your Intercept YAML policy under the tools section for write_secret. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the HashiCorp Vault MCP server.

What risk level is write_secret?

write_secret is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit write_secret?

Yes. Add a rate_limit block to the write_secret rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block write_secret completely?

Set action: deny in the Intercept policy for write_secret. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides write_secret?

write_secret is provided by the HashiCorp Vault MCP server (hashicorp/vault-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

ENFORCE POLICIES ON HASHICORP VAULT

Open source. One binary. Zero dependencies.

VIEW ON GITHUB Full HashiCorp Vault policy →