Embers: Tabletop RPG Toolkit

Add a spell to a campaign's allowlist

play_add_campaign_spell

Add a vault spell to a campaign's allowlist. The spell always lands on the leg matching the SPELL's own ruleset — the campaign must have a leg for that ruleset or play answers 400. The optional ruleset param never retargets; it only confirms the expected leg, and a mismatch answers 400. Caller must be the campaign's owner, a gamemaster or player with an accepted seat (watchers excluded), or an admin with Admin Mode on.

Input Schema

Name	Required	Description
`ruleset`	No	Optional confirmation of the target leg's ruleset. The entity always lands on the leg matching its OWN ruleset — this param never retargets; when present, play verifies it matches that leg and answers 400 on a mismatch. Omit unless you want the placement double-checked.
`spellId`	Yes	Vault document id (`spellId`). Required.
`campaignId`	Yes	Campaign id.

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedSep 27, 2026

removedInput schema / properties / ruleset / enum

Removed value: -[
-  "5th Edition",
-  "5e24",
-  "PFRPG",
-  "PFRPG2",
-  "PF Playtest",
-  "Savage Worlds",
-  "Savage Embers",
-  "Solarian Conflict",
-  "Embers RPG",
-  "Universal",
-  "Fate Core",
-  "Fate Accelerated"
-]

addedInput schema / properties / ruleset / minLength
```
Added value: +1
```

First observedSep 21, 2026

TDQS

A4.5/5.0

Behavior5/5

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

Goes well beyond the annotations by disclosing the leg-routing rule (the spell always lands on the leg matching its own ruleset), the two 400 failure conditions, and the precise authorization model (owner, GM, accepted-seat player, admin with Admin Mode; watchers excluded). This is exactly the operational context annotations cannot convey.

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?

Three dense sentences with no filler, and the core placement rule is front-loaded ahead of the failure conditions and auth requirements. Every sentence carries decision-relevant information.

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?

An output schema exists, so return values need no explanation, and the description covers placement semantics, error conditions, and authorization fully. Nothing an agent needs to invoke this correctly is missing.

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 baseline is 3. The description restates the ruleset param's non-retargeting/confirmation behavior, which is already spelled out verbatim in the schema; it adds little parameter meaning beyond what the schema provides.

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?

States a specific verb and resource ('Add a vault spell to a campaign's allowlist'), which cleanly distinguishes it from the sibling play_add_campaign_item, play_add_campaign_rule, and play_remove_campaign_spell. An agent can identify what the tool does without opening the schema.

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?

Gives clear operating context: the campaign must already have a leg for the spell's ruleset or the call answers 400, and the caller must hold an owner/gamemaster/accepted-seat/admin role. It does not name sibling alternatives (e.g., the remove counterpart) or state when not to use it, so it falls short of a 5.

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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