Sigistry Plugin Catalog (formerly Claude Registry)
REMOTE · CLAUDEREGISTRY.COM · SCANNED SEP 21
Renamed: prefer com.sigistry/plugin-catalog. This legacy endpoint keeps working.
Available components
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 Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability82
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 766 tokens (~95/item across 8 items; 8 tools + 0 resources), lean.Pass
- 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
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 8 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
How do I install the Sigistry Plugin Catalog (formerly Claude Registry) MCP server?
Sigistry Plugin Catalog (formerly Claude Registry) is a hosted endpoint at https://clauderegistry.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 · clauderegistry.com
claude mcp add --transport http com-clauderegistry-plugin-catalog 'https://clauderegistry.com/mcp'
{
"mcpServers": {
"com-clauderegistry-plugin-catalog": {
"url": "https://clauderegistry.com/mcp"
}
}
} {
"servers": {
"com-clauderegistry-plugin-catalog": {
"type": "http",
"url": "https://clauderegistry.com/mcp"
}
}
} [mcp_servers.com-clauderegistry-plugin-catalog] url = "https://clauderegistry.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-clauderegistry-plugin-catalog": {
"type": "remote",
"url": "https://clauderegistry.com/mcp",
"enabled": true
}
}
} openclaw mcp add com-clauderegistry-plugin-catalog --url 'https://clauderegistry.com/mcp' --transport streamable-http
mcp_servers:
com-clauderegistry-plugin-catalog:
url: "https://clauderegistry.com/mcp" {
"McpServers": {
"com-clauderegistry-plugin-catalog": {
"Transport": "http",
"Url": "https://clauderegistry.com/mcp"
}
}
} assistant mcp add com-clauderegistry-plugin-catalog -t streamable-http -u 'https://clauderegistry.com/mcp'
{
"mcpServers": {
"com-clauderegistry-plugin-catalog": {
"type": "http",
"url": "https://clauderegistry.com/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
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.
- 12 Sept 26 0
- Schema quality: 574 → 766 ▼ functional
- Server version: 1.5.0 → 1.6.0 functional
- New tool “get_scorecard” functional
- New tool “list_scorecards” functional
- 28 Aug 26 0
- Tool “search_plugins” rewrote its description, which is the text the model reads security
- Tool “verify_plugin” rewrote its description, which is the text the model reads security
- Schema quality: 84 → 95 ▼ functional
- Server version: 1.4.0 → 1.5.0 functional
- New tool “get_skill” functional
- New tool “search_skills” functional
- 26 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
- 25 Aug 26 +1
- Stability: 0.97 → pass security
- 24 Aug 26 +1
- The server changed its declared name: clauderegistry → sigistry security
- Tool “get_plugin” rewrote its description, which is the text the model reads security
- Tool “list_categories” rewrote its description, which is the text the model reads security
- Tool “search_plugins” rewrote its description, which is the text the model reads security
- Tool “verify_plugin” rewrote its description, which is the text the model reads security
- 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
- 7 Aug 26 0
- Tool “get_plugin” rewrote its description, which is the text the model reads security
- Tool “search_plugins” rewrote its description, which is the text the model reads security
- Schema quality: 48 → 84 ▼ functional
- Server version: 1.1.0 → 1.4.0 functional
- New tool “verify_plugin” 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
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 21 Sept 2026 · Probed https://clauderegistry.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=clauderegistry.com | CN=YE2,O=Let's Encrypt,C=US | 13 Aug 2026 | 11 Nov 2026 | ECDSA 256 | ECDSA-SHA384 | 55224eb323f670561698a2af036039b59bb |
| SANs: clauderegistry.com | ||||||
| CN=YE2,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 4df3b15dd6c0784c507cd37b58e6f115 |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of clauderegistry.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| clauderegistry.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 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://clauderegistry.com/mcp | Verified | 200 | |
| http (plaintext) | http://clauderegistry.com/mcp | HTTPS enforced | 301 | https://sigistry.com/mcp |
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 →
get_plugin Get a Claude Code plugin ~68
Get the full details of a single Sigistry plugin by its id, including install commands, component counts, and its security-audit result (per-check pass/fail from the Verified by Sigistry methodology).
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | the plugin id, e.g. "sql-safety-net" |
| Name | Type | Req | Description |
|---|---|---|---|
| agents | array | yes | relative paths to agent files |
| author | object | – | – |
| category | string | – | – |
| commands | array | yes | relative paths to command files |
| counts | object | yes | component counts |
| description | string | – | – |
| homepage | string | – | – |
| id | string | yes | – |
| installCommand | string | yes | command to install this plugin |
| installMarketplace | string | yes | command to add the marketplace to Claude Code |
| license | string | – | – |
| name | string | yes | – |
| searchableText | string | yes | lowercased text used for matching |
| skills | array | yes | relative paths to skill manifests |
| tags | array | yes | keywords from the marketplace entry |
| verification | – | – | security-audit result for this plugin (null when never audited) |
| version | string | – | – |
No examples provided.
get_scorecard Get an MCP server scorecard ~104
Get the full scorecard for one graded MCP server by its id: the overall grade, per-axis pass/partial/fail with cited evidence, hardening notes, the rubric version, and the exact commit graded. Grades describe the pinned commit only; a re-grade at a newer commit can be requested via an issue on the marketplace repo.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | scorecard id, e.g. "sigistry-catalog" (find ids via list_scorecards) |
| Name | Type | Req | Description |
|---|---|---|---|
| axes | array | yes | per-axis results with evidence |
| commit | – | – | – |
| date | – | – | – |
| endpoint | – | – | – |
| grade | string | yes | – |
| id | string | yes | – |
| name | string | yes | – |
| notes | array | – | hardening suggestions and context |
| repo | – | – | – |
| rubricUrl | – | – | – |
| rubricVersion | – | – | – |
| selfAssessment | boolean | – | – |
No examples provided.
get_skill Get a verified skill (with portable source) ~120
Get one Sigistry skill by name, including the full raw SKILL.md source. The source is portable: it can be applied directly in any SKILL.md-aware agent (Claude Code, Claude Desktop, and others) without installing anything, or installed natively in Claude Code via the parent plugin, which keeps it verified and updated. The returned skill passed the Sigistry skill-safety check at the parent plugin's verification date.
| Name | Type | Req | Description |
|---|---|---|---|
| name | string | yes | the skill name, e.g. "assessment-scoring" (find names via search_skills) |
| Name | Type | Req | Description |
|---|---|---|---|
| commit | string | – | pinned commit the source is served from, when externally hosted |
| description | string | yes | the skill trigger: when an agent should load it |
| detailUrl | string | yes | human-readable page for this skill |
| hosting | string | yes | "registry" (vendored here) or "external" (author repo, verified at a pinned commit) |
| installCommand | string | yes | Claude Code command installing the parent plugin (skill loads automatically) |
| name | string | yes | stable skill name, e.g. "assessment-scoring" |
| plugin | string | yes | parent plugin id that ships this skill |
| pluginCategory | string|null | yes | category of the parent plugin |
| repo | string | – | author repo (owner/name), when externally hosted |
| source | string|null | yes | the complete raw SKILL.md (frontmatter + body); null only if the fetch failed |
| sourceUrl | string | yes | GitHub location of the skill directory |
| verification | string | yes | verification status of the parent plugin; prefer "verified" |
| verifiedDate | string|null | yes | date of the verification run covering this skill |
No examples provided.
list_categories List plugin categories ~32
List the distinct plugin categories in the Sigistry marketplace with a count of plugins in each, plus the total plugin count.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| categories | array | yes | categories sorted by descending plugin count |
| total | integer | yes | total number of plugins |
No examples provided.
list_scorecards List MCP server scorecards ~88
List the public MCP servers Sigistry has independently graded against its scorecard rubric (transport, stateless core, lifecycle, authorization, tool design, security hygiene), each with an overall grade A-F and the exact commit graded. Useful before connecting an agent to a third-party MCP server: check whether it has been assessed and how it scored. Use get_scorecard for the full per-axis breakdown.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| rubricUrl | string|null | yes | – |
| rubricVersion | string|null | yes | – |
| scorecards | array | yes | – |
| total | integer | yes | – |
No examples provided.
search_plugins Search Claude Code plugins ~86
Search the Sigistry marketplace of Claude Code plugins by keyword and/or category. Returns matches with their install command and verification status (the registry runs an eight-check security audit; prefer "verified" plugins when recommending an install).
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | e.g. "database", "devops", "git" |
| query | string | – | keywords, e.g. "database migration" |
| Name | Type | Req | Description |
|---|---|---|---|
| results | array | yes | up to 15 matching plugins, best matches first |
No examples provided.
search_skills Search verified Claude Code skills ~115
Search the Sigistry catalog of verified skills (SKILL.md instruction sets for AI agents) by keyword, optionally filtered to one parent plugin. Every skill passed the skill-safety check: no command shadowing, honestly-scoped triggers, no injection or concealment language, no unsafe scripts. Use get_skill to fetch the full portable source of a match.
| Name | Type | Req | Description |
|---|---|---|---|
| plugin | string | – | restrict to skills shipped by this plugin id |
| query | string | – | keywords, e.g. "changelog" or "security review" |
| Name | Type | Req | Description |
|---|---|---|---|
| results | array | yes | up to 20 matching skills, best matches first |
No examples provided.
verify_plugin Verify a Claude Code plugin (pre-publish, runs locally) ~153
Get the recipe to run the Sigistry verification methodology (the eight static checks that gate the Verified badge: manifest integrity, hook safety, agent tool scopes, command hygiene, skill structure, skill safety, no secrets, documentation) against a plugin BEFORE publishing it. The verification runs entirely on the local machine via a dependency-free open-source Node script; the plugin code never leaves the user's computer and this server performs no computation. Call this when the user wants their plugin or skill checked, then follow the returned steps: download the script, run it against the plugin directory, and fix any FAIL findings it reports.
| Name | Type | Req | Description |
|---|---|---|---|
| pluginPath | string | – | local path to the plugin directory, used to fill in the run command (optional) |
| Name | Type | Req | Description |
|---|---|---|---|
| checks | array | yes | the eight checks the script will run |
| commands | object | yes | – |
| interpreting | string | yes | – |
| methodologyUrl | string | yes | – |
| methodologyVersion | string | yes | – |
| nextSteps | string | yes | – |
| runsWhere | string | yes | always "local": verification executes on the user's machine |
| steps | array | yes | what the agent should do, in order |
No examples provided.
What is the Sigistry Plugin Catalog (formerly Claude Registry) MCP server?
Sigistry Plugin Catalog (formerly Claude Registry) is an MCP server listed in the public MCP registry as com.clauderegistry/plugin-catalog. Renamed: prefer com.sigistry/plugin-catalog. This legacy endpoint keeps working. This page covers its hosted endpoint (https://clauderegistry.com/mcp).
Is the Sigistry Plugin Catalog (formerly Claude Registry) MCP server safe to use?
Sigistry Plugin Catalog (formerly Claude Registry) scores 86 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 Sigistry Plugin Catalog (formerly Claude Registry) MCP server expose?
Sigistry Plugin Catalog (formerly Claude Registry) exposes 8 tools: search_plugins, get_plugin, list_categories, search_skills, get_skill, and 3 more. Their descriptions and schemas cost roughly 766 tokens of context every time the server is loaded.
Does the Sigistry Plugin Catalog (formerly Claude Registry) MCP server require authentication?
No. We connected to Sigistry Plugin Catalog (formerly Claude Registry) without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Sigistry Plugin Catalog (formerly Claude Registry) MCP server still maintained?
Sigistry Plugin Catalog (formerly Claude Registry) is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.