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Unphurl

by io.github.123Ergo

signup

Create a new Unphurl account. Returns an API key (shown once, store it securely).

After signup, the user must check their email and click the verification link. The API key won't work for URL checks until the email is verified. Verification link expires after 24 hours. If the link expires, use the "resend_verification" tool to request a new one.

The account starts with 20 free pipeline check credits so the user can test with real URLs. Known domain lookups (google.com, github.com, etc.) and cached domain lookups are always free. To check more unknown domains through the full analysis pipeline, the user can purchase credits via the "purchase" tool.

Once the user has their API key, they need to add it to their MCP server configuration as UNPHURL_API_KEY.

This tool does not require an API key.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
emailYesEmail address for the account
companyNoCompany name (optional)
first_nameYesFirst name (used for personalized emails)

TDQS

A4.7/5.0
Behavior5/5

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

The description adds substantial behavioral context beyond the annotations: API key shown once, email verification required before use, free credits, and no API key needed for this tool. It does not contradict annotations; readOnlyHint=false aligns with the writing nature.

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 appropriately sized for a tool with a multi-step workflow. It is front-loaded with the core purpose, and every sentence adds useful information about post-signup requirements, credits, or next steps. No wasted words.

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

Completeness5/5

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

Given no output schema, the description fully covers the return value (API key), the verification process, expiration handling, credit behavior, and the auth requirement. It is complete for an account creation tool with these side effects.

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 description coverage is 100%, so the baseline is 3. The description does not add parameter-specific semantics beyond what the schema already provides; it focuses on the account creation flow rather than individual field meanings.

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 'Create a new Unphurl account' with a specific verb and resource. It explicitly differentiates from siblings like resend_verification and purchase by describing the account creation flow and pointing to those alternatives for different needs.

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

Usage Guidelines5/5

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

Provides explicit guidance on post-signup steps, including email verification and the 24-hour expiry. It names 'resend_verification' as the alternative for expired links and 'purchase' for additional credits, making the usage context and alternatives clear.

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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TDQS

A4.3/5.0
Disambiguation4/5

Most tools have clearly distinct purposes: check_url vs check_urls distinguish single vs batch, allowlist CRUD tools are separated, and profile management is distinct from account billing. Minor overlap exists between get_balance and get_stats (both report balance) and between list_profiles and show_defaults (both relate to scoring configuration), but descriptions clarify the differences.

Naming Consistency4/5

The vast majority of tools follow a verb_noun snake_case pattern (check_url, create_profile, list_allowlist, get_balance). A few outliers like purchase and signup are single verbs, but they are standard and do not break the overall predictability.

Tool Count4/5

18 tools is above the ideal 3-15 range but appropriate for the server's broad scope: URL analysis, custom scoring profiles, allowlist management, account billing, and reporting. Each tool serves a distinct function and none feel redundant or superfluous.

Completeness4/5

The tool surface covers the core domain thoroughly: single and batch URL checks, credit estimation, profile CRUD (create, list, delete, show defaults), allowlist CRUD, history, and account management (signup, balance, pricing, purchase). Minor gaps exist, such as no delete history or direct retrieval of a single past check by ID, but these are not critical.

Resources