MCP HeartbeatTHE MCP OBSERVATORY
Public workspace

Explore

Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · AI / LLM tooling

Castos MCP by usefulapi

By usefulapi.io Verified namespace

Read podcasts and episodes; create and update episodes; manage private subscribers in Castos.

WebsiteSource code
Connect to Castos MCP by usefulapi
Checks passed
13 / 22

1 failed · 8 not measured

Median response
312 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
14

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Outdated check

Last connection measurement is over 24 hours old. Current availability is unknown.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
004
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
310
Publisher identityCan the publisher be traced to its source?
402

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 312 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name castos-mcp.

  • Pass
    Lists tools

    tools/list returned 14 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 312 ms over 1 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 312 ms over 1 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    1 of 1 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Not measured
    Stable tool list

    Fewer than two successful probes in 30 days, so tool-list stability is not measured.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Pass
    Parameters documented

    54 of 54 parameters have a description (100%). The bar is 80%.

  • Fail
    Safety hints

    3 tools set neither readOnlyHint nor destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Pass
    Website matches publisher

    The website host matches the reverse-domain namespace.

  • Pass
    Source repo linked

    A repository URL is on file.

  • Not measured
    Repo owner matches

    This namespace is not an io.github login, so the owner comparison does not apply.

  • Pass
    Recently updated

    Updated 2026-11-10T23:35:13.390809Z, within 180 days.

  • Not measured
    Open-source licence

    The GitHub licence lookup has not returned an OSI result yet.

Start using Castos MCP by usefulapi

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

claude mcp add --transport http castos-mcp-by-usefulapi https://castos.usefulapi.io/mcp

Capabilities

Tools 14

castos_create_episode

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).

Discovered
castos_create_private_subscriber

WRITE. Add an email address as a private subscriber of a podcast, so it can access the private feed. Castos API: POST /private-subscribers.

Discovered
castos_get_episode

Get one episode of a podcast by id, with its title, notes and audio details. Castos API: GET /podcasts/{podcast_id}/episodes/{episode_id}.

Discovered
castos_get_podcast

Get one podcast by id, with its settings and metadata. Castos API: GET /podcasts/{podcast_id}.

Discovered
castos_get_private_subscriber

Get one private subscriber by subscriber id. Castos API: GET /private-subscribers/{subscriber_id}.

Discovered
castos_get_private_subscriber_by_email

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}.

Discovered
castos_list_categories

List the podcast categories that Castos accepts for the itunes_category fields. Castos API: GET /get-categories.

Discovered
castos_list_episodes

List the episodes of one podcast, with id, title, created date and publish date. Castos API: GET /podcasts/{podcast_id}/episodes.

Discovered
castos_list_podcasts

List the podcasts on the authenticated Castos account, with title, description, language and feed settings. Castos API: GET /podcasts.

Discovered
castos_list_private_subscribers

List the private subscribers of one podcast, one page at a time. Castos API: GET /private-subscribers.

Discovered
castos_reactivate_private_subscriber

WRITE. Reactivate a private subscriber by subscriber id, for example after a revoke by mistake. Castos API: POST /private-subscribers/reactivate/{subscriber_id}.

Discovered
castos_revoke_private_subscriber

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}.

Discovered
castos_update_episode

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}.

Discovered
castos_update_podcast

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}.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected312 ms14

Related servers

All alternatives

Same function and industry, ranked by checks passed then median latency.

Explore alternatives to Castos MCP by usefulapi