> ## Documentation Index
> Fetch the complete documentation index at: https://veryfront.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Write cache entry

> Create or replace one cache entry.

`veryfront__write_cache_entry`

`ttl_seconds` defaults to 300.

Requires project.cache.write.

## Access

No external-service connection is required. Use a Veryfront credential with access to the requested resources.

**Call type:** Can change resources.

## Arguments

| Field | Type | Required | Description and constraints |
| - | - | - | - |
| `project_reference` | `string` | No | Project ID or slug; optional on a project-scoped connection |
| `key` | `string` | Yes | Cache key, 1 to 512 characters: letters, digits, underscore, colon, dot, hyphen and slash. No "." or ".." segments between slashes. Minimum length: `1`. Maximum length: `512`. |
| `value` | `string` | Yes | UTF-8 string value. Values over 1 KB are stored compressed. |
| `ttl_seconds` | `integer` | No | Seconds until the entry expires, 1 to 86400. Defaults to 300 when omitted; the previous TTL is never kept. Minimum: `1`. Maximum: `86400`. |

## Example request

Send this JSON-RPC request through an initialized MCP client. Replace sample identifiers and values before calling the tool. See [MCP client setup](https://veryfront.com/docs/cloud/getting-started/connect-mcp.md).

```json title="request.json" theme={null}
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "veryfront__write_cache_entry",
    "arguments": {
      "key": "example",
      "value": "example"
    }
  }
}
```

## Result

The published output shape is summarized below. Inspect both the MCP response content and `isError` when handling a call.

| Field | Type | Required | Description and constraints |
| - | - | - | - |
| `key` | `string` | Yes | Cache key. |
| `expires_at` | `string or null` | Yes | RFC 3339 UTC time the entry expires, or null for a miss or for an entry written through the legacy no-expiry path (ttl=0). |

## Full schemas

```json title="input-schema.json" theme={null}
{
  "type": "object",
  "properties": {
    "project_reference": {
      "type": "string",
      "description": "Project ID or slug; optional on a project-scoped connection"
    },
    "key": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "pattern": "^[a-zA-Z0-9_:.\\-/]+$",
      "description": "Cache key, 1 to 512 characters: letters, digits, underscore, colon, dot, hyphen and slash. No \".\" or \"..\" segments between slashes."
    },
    "value": {
      "type": "string",
      "description": "UTF-8 string value. Values over 1 KB are stored compressed."
    },
    "ttl_seconds": {
      "type": "integer",
      "minimum": 1,
      "maximum": 86400,
      "description": "Seconds until the entry expires, 1 to 86400. Defaults to 300 when omitted; the previous TTL is never kept."
    }
  },
  "required": [
    "key",
    "value"
  ],
  "additionalProperties": false,
  "description": "Arguments for the write_cache_entry tool.",
  "$schema": "http://json-schema.org/draft-07/schema#"
}
```

```json title="output-schema.json" theme={null}
{
  "type": "object",
  "properties": {
    "key": {
      "type": "string",
      "description": "Cache key."
    },
    "expires_at": {
      "anyOf": [
        {
          "type": "string",
          "format": "date-time"
        },
        {
          "type": "null",
          "description": "The expires at returned by the tool."
        }
      ],
      "description": "RFC 3339 UTC time the entry expires, or null for a miss or for an entry written through the legacy no-expiry path (ttl=0)."
    }
  },
  "required": [
    "key",
    "expires_at"
  ],
  "additionalProperties": false,
  "description": "A cache entry without its value.",
  "$schema": "http://json-schema.org/draft-07/schema#"
}
```

<details>
  <summary>Try this tool</summary>

  Replace sample arguments with values for your project or connected account. Calls run only when you select Run tool.

  MCP tool call

  Call `veryfront__write_cache_entry` against the Veryfront MCP endpoint.

  Bearer token or API key

  Arguments (JSON)

  Run this tool with these arguments.

  Run tool

  Output JSON

  <pre />
</details>


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