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PKI Studio MCP

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by pkistudio

Create CSR

create_csr

Craft a PKCS#10 certificate signing request from a private key, public key, and subject DN.

Instructions

Create a PKCS#10 certificate signing request from a PKCS#8 private key, SPKI public key, and subject DN.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
privateKeyYesPKCS#8 private key as DER, PEM, HEX, or base64 text.
privateKeyFormatNoInput format. Defaults to auto detection.
publicKeyYesSPKI public key as DER, PEM, HEX, or base64 text.
publicKeyFormatNoInput format. Defaults to auto detection.
subjectDnYesSubject DN, for example CN=example.com, O=Example, C=JP.
hashAlgorithmNoHash algorithm for signing.SHA-256
encodingNoOutput encoding for DER or value bytes.hex
Behavior2/5

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

No annotations provided. The description does not disclose side effects, permissions, or output details beyond the creation process. It lacks transparency about whether the tool modifies state or just returns data, and does not mention the format of the resulting CSR.

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?

Single sentence with no extraneous information. Front-loaded with the most critical details, making it efficient and easy to parse.

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

Completeness3/5

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

Concise but missing details on return value or output format. Without output schema or annotations, the description is adequate for core functionality but incomplete for full agent understanding.

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

Parameters3/5

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

Schema coverage is 100%, so the schema fully documents parameters. The description adds context about cryptographic standards (PKCS#10, PKCS#8, SPKI) but does not provide additional parameter-level meaning beyond what the schema already offers.

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

Purpose5/5

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

The description clearly states the tool creates a PKCS#10 CSR from a PKCS#8 private key, SPKI public key, and subject DN, specifying the exact cryptographic standards and distinguishing it from siblings like create_self_signed_certificate.

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

Usage Guidelines3/5

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

No explicit guidance on when to use this tool versus alternatives. The description implies the prerequisite of having keys but does not elaborate on use cases or when to choose this over other tools.

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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