HiddenContent
Check a document for hidden text before your agent reads it. PDF, Office, RTF, HTML.
The current version, v0.4.14, was published to the official MCP registry on 2026-09-04. It is distributed as @hiddencontent/mcp on npm and as a hosted remote over streamable-http, filed under Documents & Spreadsheets by this index, and declares 3 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.
Using HiddenContent in Claude, Cursor, Gemini CLI, Cline, or Zed?
MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).
Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less
uv tool install mcpindex-gate && mcpindex-config-wireSemantic screen found no manipulation pattern in the description. Conformance probe not yet run.
mcpindex.integrity.descriptionpassINFOevidence“Normal capability, no hidden instructions”via static_description
- - Semantic screen only - the deterministic conformance probe has not run on this server
- - Confidence is reported but not yet calibrated (v1)
- - Screen reads the tool description, not the live behavior
- - advisory
- - registry description only no input schema
- - screen model 8b
- - The registry listing (version, packages, links) changed after this screen ran - the description we assessed did not
Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.
Own this server? Screen its description →
That verdict was true at screening time (snapshot 2026-09-16).
Contracts can change after screening, with no version bump. The gate pins HiddenContent’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.
See your first HOLD in 2 minutes →
Related: how to trust an MCP server · screen before install · silent contract drift
People vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land.
[Independent trust record for HiddenContent](https://mcpindex.ai/server/ai-hiddencontent-mcp) - screening verdict, registry provenance, and contract drift monitoring.<a href="https://mcpindex.ai/server/ai-hiddencontent-mcp">Independent trust record for HiddenContent</a> - screening verdict, registry provenance, and contract drift monitoring.A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.
[](https://mcpindex.ai/server/ai-hiddencontent-mcp)<a href="https://mcpindex.ai/server/ai-hiddencontent-mcp"><img src="https://mcpindex.ai/api/v1/badge/ai-hiddencontent-mcp" alt="mcpindex verdict" height="20" /></a>HCS_API_TOKENAPI token for the HiddenContent service. Get one at https://hiddencontent.ai/start?ref=mcp-registry — the server refuses to start without it and says so.
HCS_URLBase URL of the service. Defaults to the hosted API; set it only when pointing at a self-hosted instance.
HCS_CAPABILITIESComma-separated list of what your agent can actually do. The only accepted values are `tool-use`, `network-egress` and `code-execution`. These turn on the checks for concealed text that instructs a model to call a tool, send data or run code — declaring more can raise severity and never lowers it, and declaring nothing leaves those checks inert. Defaults to `tool-use` in the bundle install.
HCS_API_TOKENAPI token for the HiddenContent service. Get one at https://hiddencontent.ai/start?ref=mcp-registry — the server refuses to start without it and says so.
HCS_URLBase URL of the service. Defaults to the hosted API; set it only when pointing at a self-hosted instance.
HCS_CAPABILITIESComma-separated list of what your agent can actually do. The only accepted values are `tool-use`, `network-egress` and `code-execution`. These turn on the checks for concealed text that instructs a model to call a tool, send data or run code — declaring more can raise severity and never lowers it, and declaring nothing leaves those checks inert. Defaults to `tool-use` in the bundle install.
Convert documents and web pages to clean Markdown: PDF, DOCX, XLSX, EPUB, scanned files, any URL.
Turn PDFs, scans and photos into a queryable database. Invoices, CVs, receipts, in bulk.
Turn CSV or Excel data into styled choropleth and categorical maps of India from plain language.