Conversions across 221 color spaces, tested against cited sources: CSS strings, gamut, LUTs
Nothing to run from here
Castos MCP by usefulapi is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
93/100
tool-list score
14
tools declared
remote
at its publisher
—
calls last 7d
What it does
Read podcasts and episodes; create and update episodes; manage private subscribers in Castos.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http castos-mcp-by-usefulapi https://castos.usefulapi.io/mcp
# 2 — ask your agent for something these tools do
# castos_list_podcasts, castos_get_podcast, castos_update_podcast and 11 more
Castos MCP by usefulapi costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
USAll 664 servers
usefulapi664 servers
25 categories
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http castos-mcp-by-usefulapi https://castos.usefulapi.io/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
14 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
List the podcasts on the authenticated Castos account, with title, description, language and feed settings. Castos API: GET /podcasts.
No parameter schema on file.
Get one podcast by id, with its settings and metadata. Castos API: GET /podcasts/{podcast_id}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. |
WRITE. Change the metadata of an existing podcast. Only the fields you pass are sent. It does not change the cover image, the feed redirect or the episodes. Castos API: POST /podcasts/{podcast_id}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. | |
| podcast_title | string | no | Podcast title. |
| podcast_description | string | no | Podcast description. |
| show_type | string | no | Episodic or serial show. |
| keywords | string | no | Comma-separated keywords. |
| website | string | no | A public https URL. |
| author_name | string | no | Author name. |
| podcast_owner | string | no | Podcast owner name. |
| owner_email | string | no | Owner email address. |
| copyright | string | no | Copyright line. |
| explicit | string | no | 'True' or 'False': explicit content. |
| language | string | no | Language code, for example 'en'. |
| itunes_category1 | string | no | Category 1 (see castos_list_categories). |
| itunes_category2 | string | no | Category 2 (see castos_list_categories). |
| itunes_category3 | string | no | Category 3 (see castos_list_categories). |
| itunes | string | no | Apple Podcasts URL. |
| google_podcasts | string | no | Google Podcasts URL. |
| feed_episodes_number | integer | no | Number of episodes in the RSS feed. |
| country_of_origin_1 | string | no | Country of origin 1. |
| country_of_origin_2 | string | no | Country of origin 2. |
List the episodes of one podcast, with id, title, created date and publish date. Castos API: GET /podcasts/{podcast_id}/episodes.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. |
Get one episode of a podcast by id, with its title, notes and audio details. Castos API: GET /podcasts/{podcast_id}/episodes/{episode_id}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. | |
| episode_id | yes | Numeric Castos id. |
WRITE. Add a new episode to a podcast. The audio is downloaded from episode_file_url (https, up to 40 MB) and uploaded to Castos. The episode may publish to the live feed at once, so check the publish date. Castos API: POST /podcasts/{podcast_id}/episodes (multipart).
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. | |
| post_title | string | yes | Episode title. |
| post_content | string | yes | Episode show notes (HTML or text). |
| episode_file_url | string | yes | Public https URL of the audio file (up to 40 MB). |
| keywords | string | no | Comma-separated keywords. |
| series_number | string | no | Season or series number. |
| episode_number | string | no | Episode number. |
| episode_type | string | no | Episode type, for example 'Full'. |
| post_date | string | no | Publish date, yyyy-mm-dd or yyyy-mm-dd hh:mm:ss. |
WRITE. Change the text or settings of an existing episode. Only the fields you pass are sent. To replace the audio, pass updated_episode_file as a public https URL. Castos API: POST /podcasts/{podcast_id}/episodes/{episode_id}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. | |
| episode_id | yes | Numeric Castos id. | |
| post_title | string | no | Episode title. |
| post_content | string | no | Episode show notes. |
| updated_episode_file | string | no | New audio file as a public https URL. |
| keywords | string | no | Comma-separated keywords. |
| series_number | string | no | Season or series number. |
| episode_number | string | no | Episode number. |
| episode_type | string | no | Episode type. |
| post_date | string | no | Publish date, yyyy-mm-dd or yyyy-mm-dd hh:mm:ss. |
List the private subscribers of one podcast, one page at a time. Castos API: GET /private-subscribers.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. | |
| per_page | integer | no | Results per page, 1 to 250. |
| page | integer | no | Page number (default 1). |
Get one private subscriber by subscriber id. Castos API: GET /private-subscribers/{subscriber_id}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| subscriber_id | yes | Numeric Castos id. |
Find a private subscriber by email. The reply lists the subscriber and its subscriptions; the subscription id is what castos_revoke_private_subscriber needs. Castos API: GET /private-subscribers/email/{email_address}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| email_address | string | yes | Subscriber email address. |
WRITE. Add an email address as a private subscriber of a podcast, so it can access the private feed. Castos API: POST /private-subscribers.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| podcast_id | yes | Numeric Castos id. | |
| string | yes | Subscriber email address. | |
| name | string | no | Subscriber name. |
WRITE. Reactivate a private subscriber by subscriber id, for example after a revoke by mistake. Castos API: POST /private-subscribers/reactivate/{subscriber_id}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| subscriber_id | yes | Numeric Castos id. |
WRITE. Cancel one private subscription, so the subscriber loses access to that private feed. Pass the subscription id (see castos_get_private_subscriber_by_email). Castos API: POST /private-subscribers/{subscription_id}.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| subscription_id | yes | Numeric Castos id. |
List the podcast categories that Castos accepts for the itunes_category fields. Castos API: GET /get-categories.
No parameter schema on file.
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install Castos MCP by usefulapi or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: —
ATool-list grade · score 93 / 100
Release 1.0.2 · scanned 8 Nov 2026
Graded from the tools this server lists, not from its source code.
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
Threat score100
Client score93
Findings0 threat · 0 capability
Capabilitymoderate
Coveragemanifest
Verificationnot in this report
Surface digest8f6c93e1f55b2bfcd521e326d8c2a150e94758c7b7ae0f7ca88af54694f3be10
Score vectorthreat 100 → client 93
| Term | Level | What it prices | Points |
|---|---|---|---|
| capability-exposure | moderate | capability blast radius (moderate) — client exposure if the model is manipulated | −3 |
| coverage-honesty | manifest | inspection depth (manifest) — how much of the target the scan could see | −4 |
score = clamp(round(threatScore − E_cap − E_ver − E_cov), 0, 100). No model, no opinion, no network call at scoring time: the same methodology version against the same bytes always produces this number, and every line above is a field of the report rather than a summary of it.
What the scan could actually read
A grade is only as meaningful as its coverage, so the scanner publishes its own depth before it publishes its result.
The scan read each tool’s name, description, input schema and annotations exactly as the server listed them the last time it answered us; no code was reviewed. We ask the server again about once a month, and a list that changed is graded again.
Tool surfaceread
Implementation sourcenot available
Package metadatanot available
Live transportnot available
The implementation source was not read — this reflects the declared tool metadata only.
Capability — what it could do if the model were manipulated
Tags derived from each tool’s schema and the implementation, not from what the tool calls itself. moderate is the level these add up to.
| Tool | Capability tags | Why the tag was assigned |
|---|---|---|
| castos_list_podcasts | no tags | |
| castos_get_podcast | no tags | |
| castos_update_podcast | no tags | |
| castos_list_episodes | no tags | |
| castos_get_episode | no tags | |
| castos_create_episode | state-write | state-write: declares destructiveHint: true |
| castos_update_episode | no tags | |
| castos_list_private_subscribers | no tags | |
| castos_get_private_subscriber | no tags | |
| castos_get_private_subscriber_by_email | no tags | |
| castos_create_private_subscriber | state-write | state-write: declares destructiveHint: true |
| castos_reactivate_private_subscriber | no tags | |
| castos_revoke_private_subscriber | state-write | state-write: declares destructiveHint: true |
| castos_list_categories | no tags |
Toxic-flow graph
The lethal trifecta, checked as a graph rather than as a checklist: untrusted input, a sensitive source and an external sink have to meet before there is a path worth worrying about.
The public result for this release does not print the flow graph, so there is nothing to show here. That is not the same as "no paths were found": what the scan did read is above, under coverage.
Supply chain and provenance
Integrityfirst-seen
Surface digest8f6c93e1f55b2bfc
Scanned2026-11-08
This is the first scan of this surface here, so there is nothing yet to compare it against.
Every result on this tab comes from one deterministic pass over the published package — offline, rule by rule, and auditable line by line above. Same methodology version, same bytes, same score.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 1.0.2.
1.0.2
undated
latestNo release note was published with this version.
—
no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish Castos MCP by usefulapi can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.