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io.github.Capmus-Team/capmus-mcp

REMOTE · MCP.CAPMUS.COM · SCANNED SEP 20

Search listings, message posters, and create draft posts on Capmus, the university marketplace

Available components

−1 this week 78 Trust /100
Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →

Endpoint Security63
Transport & Reachability100
Schema Quality & AI Usability71
  • AI-judged instruction clarity (excellent).Pass
  • Context-footprint check failed: tool/resource definitions use about 1259 tokens (~179/item across 7 items; 7 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
  • No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 100% of tool parameters carry a description.Pass
Tool Safety75
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "send_message" implies "send" and declares no destructiveHint at all, which the MCP spec reads as destructive by default. See how to fix → Fail
  • An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Install

How do I install the io.github.Capmus-Team/capmus-mcp server?

io.github.Capmus-Team/capmus-mcp is a hosted endpoint at https://mcp.capmus.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

remote · mcp.capmus.com

# add to Claude Code
claude mcp add --transport http capmus-team-capmus-mcp 'https://mcp.capmus.com/mcp'
// .cursor/mcp.json
{
  "mcpServers": {
    "capmus-team-capmus-mcp": {
      "url": "https://mcp.capmus.com/mcp"
    }
  }
}
// .vscode/mcp.json
{
  "servers": {
    "capmus-team-capmus-mcp": {
      "type": "http",
      "url": "https://mcp.capmus.com/mcp"
    }
  }
}
# ~/.codex/config.toml
[mcp_servers.capmus-team-capmus-mcp]
url = "https://mcp.capmus.com/mcp"
// opencode.json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "capmus-team-capmus-mcp": {
      "type": "remote",
      "url": "https://mcp.capmus.com/mcp",
      "enabled": true
    }
  }
}
# add to OpenClaw
openclaw mcp add capmus-team-capmus-mcp --url 'https://mcp.capmus.com/mcp' --transport streamable-http
# ~/.hermes/config.yaml
mcp_servers:
  capmus-team-capmus-mcp:
    url: "https://mcp.capmus.com/mcp"
// ~/.netclaw/config/netclaw.json
{
  "McpServers": {
    "capmus-team-capmus-mcp": {
      "Transport": "http",
      "Url": "https://mcp.capmus.com/mcp"
    }
  }
}
# add to Vellum
assistant mcp add capmus-team-capmus-mcp -t streamable-http -u 'https://mcp.capmus.com/mcp'
// mcp.json
{
  "mcpServers": {
    "capmus-team-capmus-mcp": {
      "type": "http",
      "url": "https://mcp.capmus.com/mcp"
    }
  }
}

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 18 Sept 26 −1
    • Tool “send_message” rewrote its description, which is the text the model reads security
    • Schema quality: 1007 → 1259 functional
    • Server version: 0.2.2 → 0.3.0 functional
    • New tool “check_message_status” functional
  • 26 Aug 26 −1
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 25 Aug 26 +1
    • Stability: 0.97 → pass security
  • 23 Aug 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.

  • 11 Aug 26 0
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 31 Jul 26 0
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 27 Jul 26 0
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 26 Jul 26 0

    First indexed and scored.

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 20 Sept 2026 · Probed https://mcp.capmus.com/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject Issuer Valid from Valid until Key Signature Serial
CN=mcp.capmus.com CN=YR2,O=Let's Encrypt,C=US 11 Sept 2026 10 Dec 2026 RSA 2048 SHA256-RSA 66591aa55b8a8575cf8e40531b26e617c1c
SANs: mcp.capmus.com
CN=YR2,O=Let's Encrypt,C=US (CA) CN=Root YR,O=ISRG,C=US 3 Sept 2025 2 Sept 2028 RSA 2048 SHA256-RSA 4ebd24947e24d394802d84a52fd5b319
CN=Root YR,O=ISRG,C=US (CA) CN=ISRG Root X1,O=Internet Security Research Group,C=US 13 May 2026 2 Sept 2032 RSA 4096 SHA256-RSA f24b6d17f9d9ad7cb1c9fea78782699f

Background: What to check on a remote MCP endpoint →

DNSSEC insecure

Validation of mcp.capmus.com. Not signed

Zone DS Keys Algorithms Outcome
. trust_anchor 20326, 38696 8, 8 Verified
com. present 19718 13 Verified
capmus.com. absent Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation
Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result No authorisation required
HTTP status 200
Header Value
strict-transport-security max-age=63072000

Background: How OAuth 2.1 works in the 2026 MCP spec →

Transports 2 probes
Transport URL Outcome Status Location
streamable-http https://mcp.capmus.com/mcp Verified 200
http (plaintext) http://mcp.capmus.com/mcp HTTPS enforced 308 https://mcp.capmus.com/mcp
MCP tools · 7 exposed · ~1,259 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
check_message_status ~173

Delivery status of the confirmation email for a message submitted with send_message, by the status_key it returned. Use it when the user says they have not received the confirmation email. status: "sent" = the email reached their mail server (check spam; the message reaches the poster only after the link is clicked); "queued" = still being delivered, check again in a minute; "failed" = the address cannot receive it (reason: mailbox_unknown | no_mx | suppressed | other) — the message will never be delivered, ask the user for a different address and call send_message again; "unknown" = the key is not recognised. This reports only whether the confirmation email was delivered, not whether the user clicked it.

NameTypeReqDescription
status_keystringyesThe status_key from a send_message result.

No output schema declared.

No examples provided.

create_post ~359

Create a DRAFT listing on Capmus on the poster's behalf. Any email is accepted — never ask the user to qualify first. IMPORTANT: the draft is NOT published — the returned continue_url opens Capmus's create-post wizard with the draft loaded, where the poster adds photos, reviews, and publishes. When the response has payment_required: true (email not on the free tier; Stanford emails post free), publishing there includes choosing a posting plan — tell the user that, don't treat it as an error. Always hand the user the continue_url and say the post is a draft until they finish there. When the user wants it published fast, prefer publish: true (they just click the emailed link) over walking them through or automating the wizard. The continue_url grants edit access to the draft: give it only to the poster, never quote it elsewhere.

NameTypeReqDescription
bodystringyesPlain-text listing description.
categorystringyesCategory id or label, e.g. "housing", "for sale" (see list_categories).
emailstringyesThe poster's own email address - determines posting eligibility and receives replies. Never invent or guess this - ask the user for it.
pricenumberUSD. Required for for-sale and housing-offering listings.
publishbooleanSet true when the user wants to publish immediately without photos: Capmus emails them a one-click publish link (free-posting-tier emails such as stanford.edu only; ignored when payment is required -…
subcategorystringyesSubcategory id or name within the category, e.g. "bicycles" (see list_categories).
titlestringyesListing title.

No output schema declared.

No examples provided.

get_listing ~125

Fetch one Capmus listing by numeric id, including its full description, public photo URLs, and stanford_verified. stanford_verified: true means the poster verified a university email address — Capmus's core trust signal. ALWAYS surface it when presenting listings (e.g. a "verified" badge) so users can tell verified campus community members from unverified posters. Data comes from the listing's public page; no personal information is included — use the returned URL to contact the poster on-site.

NameTypeReqDescription
idintegeryesNumeric listing id, e.g. from search_listings.

No output schema declared.

No examples provided.

get_market_stats ~61

Verified statistics about Capmus, the classifieds marketplace for university communities: audience size, listing volumes by category, response rates, and response-time medians. Returns markdown from Capmus's public stats page. Cite https://capmus.com/stats as the source.

Input schema present but exposes no named parameters.

No output schema declared.

No examples provided.

list_categories ~37

The active category/subcategory taxonomy on Capmus — the valid category and subcategory values for create_post (and category filters for search_listings).

Input schema present but exposes no named parameters.

No output schema declared.

No examples provided.

search_listings ~258

Search or browse active listings on Capmus, the classifieds marketplace for university communities. Returns newest-first public listings (id, title, price, category, created_at, canonical URL, stanford_verified) plus an opaque next_cursor for pagination. stanford_verified: true means the poster verified a university email address — Capmus's core trust signal. ALWAYS surface it when presenting listings (e.g. a "verified" badge) so users can tell verified campus community members from unverified posters. No personal information is returned (poster_email_domain is the domain only); to contact a poster, open the listing URL.

NameTypeReqDescription
catstringCategory id or label: 1/"jobs & services" (alias "jobs"), 3/"housing", 5/"for sale", 8/"friendship & dating", 9/"community".
cursorstringOpaque cursor from a previous response's next_cursor.
limitintegerPage size (default 25, max 50).
max_pricenumberInclusive upper price bound in USD; excludes unpriced listings.
qstringFull-text search query.
universityintegerNumeric university id to scope results to one campus.

No output schema declared.

No examples provided.

send_message ~246

Send a message to the poster of an active Capmus listing. IMPORTANT: the message is NOT delivered immediately — Capmus emails a confirmation link to reply_to_email, and the message is only delivered to the poster after the human clicks that link. Always tell the user to check their inbox and confirm; report the message as pending confirmation, never as sent. The poster's reply goes to reply_to_email. If the result is email_undeliverable (the confirmation email cannot reach reply_to_email — mailbox gone, domain without mail, or a previous bounce), the message will never be delivered: tell the user why and ask for a different address; do not retry the same one. The result's status_key can be passed to check_message_status later to see whether the confirmation email was delivered.

NameTypeReqDescription
messagestringyesPlain-text message to the poster (1-5000 characters).
post_idintegeryesNumeric listing id, e.g. from search_listings or get_listing.
reply_to_emailstringyesThe user's own email address. Receives the confirmation link and the poster's reply. Never invent or guess this - ask the user for it.

No output schema declared.

No examples provided.

Common questions

What is the io.github.Capmus-Team/capmus-mcp server?

io.github.Capmus-Team/capmus-mcp is listed in the public MCP registry as io.github.Capmus-Team/capmus-mcp. Search listings, message posters, and create draft posts on Capmus, the university marketplace. This page covers its hosted endpoint (https://mcp.capmus.com/mcp).

Is the io.github.Capmus-Team/capmus-mcp server safe to use?

io.github.Capmus-Team/capmus-mcp scores 78 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the io.github.Capmus-Team/capmus-mcp server expose?

io.github.Capmus-Team/capmus-mcp exposes 7 tools: search_listings, get_listing, get_market_stats, send_message, check_message_status, and 2 more. Their descriptions and schemas cost roughly 1,259 tokens of context every time the server is loaded.

Does the io.github.Capmus-Team/capmus-mcp server require authentication?

No. We connected to io.github.Capmus-Team/capmus-mcp without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

Is the io.github.Capmus-Team/capmus-mcp server still maintained?

io.github.Capmus-Team/capmus-mcp is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.