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optionality-mcp

by io.github.lonniev

optionality_update_patron_credential

Add or update a single patron credential field.

Merges into existing stored credentials without affecting other fields. Useful for setting an account identifier after OAuth, changing a default brain, etc. Free. Proof of npub ownership is required — this is a write to the patron's sensitive credential vault.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
npubYesThe patron's Nostr public key (npub1...).
fieldYesThe credential field name to set.
valueYesThe value to store.
dpop_tokenYesRaw JSON of a kind-27235 Nostr event signed by npub — not base64, not NIP-98 'Authorization: Nostr <b64>' framing. Its `u` tag must hold THIS tool's exact name (from tools/list), not the endpoint URL; content:"", created_at within 60s of now, and a random `nonce` tag recommended. Or a cached dpop_token phrase.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

TDQS

A4.2/5.0
Behavior4/5

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

Without annotations, the description carries the full burden. It discloses the merge semantics, sensitive nature of the credential vault, and the proof-of-ownership requirement. No contradictions with structured fields.

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 concise (4 sentences) and front-loaded with the primary action. Each sentence adds value: main action, merge behavior, use cases, and security requirement. No redundancy.

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

Completeness4/5

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

With an output schema present, return values are covered. The description covers necessary behavioral context (merge, security, use cases) and parameter constraints. Minor gap: no mention of error conditions or rate limits, but acceptable given the tool's simplicity.

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 baseline is 3. The description adds general context about merging and security but does not enrich individual parameter meanings beyond what the schema already provides (e.g., dpop_token is thoroughly described in the schema).

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 verb 'Add or update' and the resource 'single patron credential field'. It also explains the merge behavior, distinguishing it from deletion or retrieval tools like optionality_delete_patron_credential and optionality_get_patron_credential_fields.

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

Usage Guidelines4/5

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

Provides explicit use cases (e.g., setting account identifier after OAuth, changing default brain) and notes the requirement for proof of ownership. However, it lacks explicit guidance on when not to use the tool or direct comparisons to alternatives.

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

B3.1/5.0
Disambiguation2/5

There is substantial overlap and confusion between multiple sets of tools. For example, `optionality_get_operator_onboarding_status` and `optionality_get_patron_onboarding_status` serve different identities but have a similar purpose that could be confusing. More critically, there are generic-named tools like `optionality_receive_credentials` and `optionality_receive_npub_proof` that both drain a relay mailbox in a very similar way, distinguished primarily by the type of token they return. The presence of both `optionality_session_status` and `optionality_service_status` is a major point of ambiguity, as both seem to check the health and configuration of the operator.

Naming Consistency4/5

The naming convention is highly consistent, using a snake_case, verb_noun pattern (e.g., `list_journal`, `delete_journal`). The prefix `optionality_` is applied to all tools. The verb 'get' and 'list' are used predictably. Minor point deduction for a few outliers like `optionality_deal_scenario` and `optionality_judge_trade` which are domain-specific verbs that don't perfectly fit the CRUD pattern but are still clear in context.

Tool Count1/5

With 71 tools, this server is severely over-staffed. This indicates poor separation of concerns, likely bundling multiple distinct domains or services into a single surface. A tool count this high dramatically increases cognitive load and API surface area, making it difficult for an agent to find the correct tool.

Completeness3/5

The tool surface covers an enormous amount of functionality, including imaginative ownership-proof flows via Nostr DMs. However, the `check_balance`/`purchase_credits` flow appears incomplete without a `refund_credits` tool for operator support scenarios. While the server has a `restore_credits` tool, it requires authentication. Overall, the surface is individually creative but organizationally incoherent.

Resources