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vault_encrypt_string

Encrypt sensitive strings for secure storage in Ansible configurations using Vault encryption.

Instructions

Encrypt a string using Ansible Vault

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
stringYes
vault_idNo
vault_password_fileNo
nameNo

Implementation Reference

  • The main handler function that executes ansible-vault encrypt_string command to encrypt the provided string using child_process.spawn, handling stdin, stdout, stderr, and errors.
    export async function encryptString(options: VaultEncryptStringOptions): Promise<string> {
      return new Promise((resolve, reject) => {
        const args = ['encrypt_string'];
        
        // Add vault ID if specified
        if (options.vault_id) {
          args.push(`--vault-id=${options.vault_id}`);
        }
        
        // Add vault password file if specified
        if (options.vault_password_file) {
          args.push(`--vault-password-file=${options.vault_password_file}`);
        }
        
        // Add name if specified
        if (options.name) {
          args.push(`--name=${options.name}`);
        }
        
        // Add --stdin flag to read from stdin
        args.push('--stdin');
    
        console.error(`Executing: ansible-vault ${args.join(' ')} (with string piped to stdin)`);
        const vaultProcess = spawn('ansible-vault', args, { stdio: ['pipe', 'pipe', 'pipe'] });
    
        let stdoutData = '';
        let stderrData = '';
    
        vaultProcess.stdout.on('data', (data) => {
          stdoutData += data.toString();
        });
    
        vaultProcess.stderr.on('data', (data) => {
          stderrData += data.toString();
        });
    
        vaultProcess.on('close', (code) => {
          if (code === 0) {
            resolve(stdoutData.trim());
          } else {
            const errorMessage = stderrData || `ansible-vault exited with code ${code}`;
            reject(new AnsibleExecutionError(`Error encrypting string: ${errorMessage}`, stderrData));
          }
        });
    
        vaultProcess.on('error', (err) => {
          reject(new AnsibleExecutionError(`Failed to start ansible-vault: ${err.message}`));
        });
    
        // Write the string to encrypt to stdin
        vaultProcess.stdin.write(options.string);
        vaultProcess.stdin.end();
      });
    }
  • Zod schema definition for input validation of the vault_encrypt_string tool, including required 'string' and optional vault_id, vault_password_file, name fields.
    export const VaultEncryptStringSchema = z.object({
      string: z.string().min(1, 'String to encrypt is required'),
      vault_id: z.string().optional(),
      vault_password_file: z.string().optional(),
      name: z.string().optional(),
    });
    
    export type VaultEncryptStringOptions = z.infer<typeof VaultEncryptStringSchema>;
  • Tool registration in the toolDefinitions map, linking the name 'vault_encrypt_string' to its description, schema, and handler function.
    vault_encrypt_string: {
      description: 'Encrypt a string using Ansible Vault',
      schema: VaultEncryptStringSchema,
      handler: vault.encryptString,
    },
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure but only states the basic function. It doesn't mention what the encryption output looks like, whether it's reversible, any security implications, rate limits, or error conditions. For a cryptographic tool, this lack of behavioral detail is problematic.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise - a single sentence that directly states the tool's purpose without any wasted words. It's appropriately sized for what it communicates, though what it communicates is minimal.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a cryptographic tool with 4 parameters, 0% schema coverage, no annotations, and no output schema, the description is woefully incomplete. It doesn't explain the encryption algorithm, output format, error handling, or relationship to the decryption sibling. The agent would struggle to use this tool correctly based solely on this description.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage and 4 parameters (1 required, 3 optional), the description provides no information about any parameters. It doesn't explain what 'vault_id', 'vault_password_file', or 'name' mean, or how they affect the encryption process. The description fails to compensate for the complete lack of schema documentation.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('encrypt') and target resource ('a string using Ansible Vault'), making the purpose immediately understandable. However, it doesn't explicitly differentiate from its sibling 'vault_decrypt_string' beyond the obvious encryption vs. decryption distinction, which is why it doesn't reach a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives, prerequisites, or context for its application. It's a standalone statement without any usage context, which is a significant gap for a tool with multiple parameters and no annotations.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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