Cronus UI
Description
Search, install, compose, add-page, and theme Cronus UI from the live registry.
What our measurements say
Cronus UI is a remote MCP server published at aicronus.com. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 757 ms, a delay an agent will notice. It offers a narrow, focused set of 8 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names are descriptive and align with their functions (e.g., 'list_components', 'get_component').
- Multiple tools provide distinct functionalities for component/block listing, searching, and installation.
Weaknesses
- Descriptions for 'list_catalog' and 'match_catalog' are vague and lack clear use-case guidance.
- Parameters like 'kind' in 'list_catalog' and 'query' in 'match_catalog' lack explicit value examples or constraints.
- No explicit error handling or constraint documentation for tools like 'get_component' or 'search_registry'.
list_catalog— Parameter 'kind' lacks explicit value examples or constraints.match_catalog— Description is incomplete and cuts off mid-sentence.list_components— Does not clarify when to use it versus 'list_blocks'.
Verdict
Event narrative
Risk: low
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 163ms → warm 166ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
list_componentsList the installable Cronus UI components (registry items of type 'registry:ui'). Returns each component's name, a readable title, its npm and registry dependencies, and the `npx cronus-ui add <name>` command to install it.
list_blocksList the installable Cronus UI blocks (registry items of type 'registry:block') — larger, composed sections such as hero, pricing, login, and dashboard. Returns each block's name, title, dependencies, and its `npx cronus-ui add <name>` install command.
list_catalogReturn compact Hydra-ready cards for every component, block, variant, and template: name, short description, design style, palette, motion, intents, and the install command. No source files — cheap on tokens. Filter with `kind`. Use `match_catalog` to pick the best item for a prompt (login + smooth animation, etc.).
kindstring
match_catalogTwo-query catalog match for low-context agents. Pass a free-text `query` (e.g. 'login page with smooth animation') and/or structured filters (`intent`, `motion`, `style`, `palette`). Returns `pick` (the recommended combination), `intent` hits, `motion` hits, and ranked `matches`. Cards carry description, design style, palette, motion, and intents — not source. Fetch source with `get_component` only after picking a name.
querystringintentstringstylestringpalettestringmotionstringkindstringlimitinteger
search_registryFuzzy-search Cronus UI components and blocks by name (case-insensitive substring match). Use this to find the right item before fetching its source with `get_component`.
querystringrequired
get_design_contextReturn the Cronus UI visual taste file (DESIGN.md) for a theme × look. Use this before generating UI so the agent follows Aurora/Neutral dual identity, one primary CTA, hairline elevation, and look rules. compact fits a system prompt; extended is the repo file. Does not modify the project.
themestringlookstringformatstring
get_componentFetch the full detail for a single Cronus UI component or block by name: its source file(s) (path + content), its npm `dependencies`, its `registryDependencies` (other registry items it needs), and the `npx cronus-ui add <name>` install command. Works for both components and blocks.
namestringrequired
get_install_commandBuild the `npx cronus-ui add ...` command for one or more components/blocks. The CLI resolves and installs each item's registry dependencies automatically. This only returns the command string — to actually install, use `install_component`.
namesarrayrequired
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Legacy
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