# com.onlyworlds/mcp

Read and write typed fictional worlds (22 linked element types) via the OnlyWorlds open standard.

- **Type:** MCP server
- **Trust:** 60/100 (B), scored on the content rubric
- **Verification:** community-indexed — nobody has claimed this listing
- **Version:** 1.0.0
- **Author:** com.onlyworlds
- **License:** Unknown
- **Endpoints:** streamable-http https://www.onlyworlds.com/mcp
- **Source:** https://www.onlyworlds.com
- **Endpoint health:** reachable (last checked 2026-09-17T12:06:25.788Z, 4 samples) — uptime is not a security property and is not part of the trust score
- **Compatible clients:** claude-code, cursor, copilot, chatgpt, gemini (basis: transport)

## Trust

60/100 (B), scored on the content rubric
- Publisher verified: no
- Install scripts: nothing suspicious found
- Prompt-injection scan: clean
- Obfuscation scan: clean
- Evidence age: 1 day

## Security scan

- **Status:** clean
- **Scanned:** 2026-09-17T12:06:25.788Z
- **Version scanned:** live
- **CVEs:** no coverage — this entry has no package coordinates to query OSV against, so "no known CVEs" is NOT asserted for it.

## Tools

11 declared. Observed from a live `tools/list` probe.
- `list_element_types` — List all 22 OnlyWorlds element types with a one-line shape summary of each. Every world is built from these types; each element has a stable UUID `id`, a `name`
- `get_element_schema` — Return the field structure of one OnlyWorlds element `type` (a slug from `list_element_types`, e.g. "character"). The result groups the type's writable fields b
- `search_schema` — Search every element type's fields for `query` (case-insensitive substring), across all 22 types. Useful for "which types have a `location` field?" or finding w
- `list_elements` — List elements of one `type` in the world named by your API-Key header, newest-created first. `type` is a slug from `list_element_types` (e.g. "character"). Opti
- `get_element` — Fetch one element by `type` and `id` (a UUID) from the world named by your API-Key header. `type` is a slug from `list_element_types`. Returns the full v2 wire 
- `search_elements` — Search elements by name across ALL 22 types in the world named by your API-Key header (case-insensitive substring match). Use this when you know part of a name 
- `get_changes` — Return the delta feed for the world named by your API-Key header: every element created/updated (`op: "upsert"`, full body) or deleted (`op: "delete"`) since `s
- `create_element` — Create one new element of `type` in the world named by your API-Key header. `type` is a slug from `list_element_types` (e.g. "character"). `element` is the fiel
- `update_element` — Update an existing element by `type` and `id`, changing ONLY the fields you pass — omitted fields are preserved. This is a server-side read-merge: the current e
- `edit_links` — Add and/or remove links on ONE multi-link `field` of an element, leaving the rest of that field's array untouched. Use this for additive/subtractive link edits 
- `bulk_apply` — Create and/or update many elements across any of the 22 types in one call. Each entry in `items` is `{"type": <slug>, "element": <payload>}` with the same paylo

## Install

**Verdict: review** — Installable, but 2 things to check first: No CVE coverage: this entry has no npm/PyPI coordinates to query OSV against, so "no known vulnerabilities" is not a claim that can be made about it.
**Cautions** (coverage gaps and advisories — never blocking)
- No CVE coverage: this entry has no npm/PyPI coordinates to query OSV against, so "no known vulnerabilities" is not a claim that can be made about it.
- No publisher has proved control of this listing; it is indexed, not vouched for.
**Config** (claude-code):
```json
"{\n  \"mcpServers\": {\n    \"mcp\": {\n      \"type\": \"http\",\n      \"url\": \"https://www.onlyworlds.com/mcp\"\n    }\n  }\n}"
```

## Blast radius

Moderate to extensive — no credential declaration found, from the publisher, the upstream registry, or the README. Known so far: mutates data; runs on someone else's infrastructure.
- Floor 26, ceiling 50 (tier: unknown)
- `unknown` means the floor and ceiling land in different bands — not measured enough to name one. It does not mean low.
- This is impact, not likelihood. A high radius is not a defect: a filesystem server is supposed to write files. It is never part of the trust score.

## Machine-readable views of this entry

- Signed JSON: https://forgeregistry.com/api/v1/packages/com.onlyworlds%2Fmcp
- Install plan: https://forgeregistry.com/api/v1/packages/com.onlyworlds%2Fmcp/install-plan
- Alternatives: https://forgeregistry.com/api/v1/alternatives/com.onlyworlds%2Fmcp
- HTML page: https://forgeregistry.com/registry/com.onlyworlds%2Fmcp
- MCP: POST https://forgeregistry.com/api/mcp → `forge_get_package` / `forge_install_plan`

## About this document

Generated by Forge (https://forgeregistry.com) — a compact rendering of the same record served, signed, at the JSON URL above. Trust and scan facts are the registry's own measurements; anything Forge did not measure is named as unmeasured rather than omitted.