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principia

R1· needs a key

Source-graded registry of organizational measurement: constructs, priors, instruments, citations.

v1 · active · repository · website · descriptor JSON · versions

An agent can connect on its own if it already holds PRINCIPIA_TOKEN.Remote endpoint behind a static API key or header. The registry never sees the value; the agent fills the placeholder.
Quality–not scored
Trust93of 100
Uptime, 30 days100%
Latency p50241 ms

Connect

8 clients · secrets stay placeholders
{
  "mcpServers": {
    "principia": {
      "type": "http",
      "url": "https://peopleprincipia.com/api/mcp",
      "headers": {
        "Authorization": "Bearer ${PRINCIPIA_TOKEN}"
      }
    }
  }
}
claude mcp add --transport http principia https://peopleprincipia.com/api/mcp --header "Authorization: Bearer ${PRINCIPIA_TOKEN}"
[mcp_servers.principia]
url = "https://peopleprincipia.com/api/mcp"
bearer_token_env_var = "PRINCIPIA_TOKEN"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "principia": {
      "type": "remote",
      "url": "https://peopleprincipia.com/api/mcp",
      "enabled": true,
      "headers": {
        "Authorization": "Bearer {env:PRINCIPIA_TOKEN}"
      }
    }
  }
}
{
  "mcpServers": {
    "principia": {
      "type": "http",
      "url": "https://peopleprincipia.com/api/mcp",
      "headers": {
        "Authorization": "Bearer ${PRINCIPIA_TOKEN}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=principia&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vcGVvcGxlcHJpbmNpcGlhLmNvbS9hcGkvbWNwIiwiaGVhZGVycyI6eyJBdXRob3JpemF0aW9uIjoiQmVhcmVyICR7UFJJTkNJUElBX1RPS0VOfSJ9fQ%3D%3D"
}
{
  "servers": {
    "principia": {
      "type": "http",
      "url": "https://peopleprincipia.com/api/mcp",
      "headers": {
        "Authorization": "Bearer ${PRINCIPIA_TOKEN}"
      }
    }
  }
}
{
  "mcpServers": {
    "principia": {
      "httpUrl": "https://peopleprincipia.com/api/mcp",
      "headers": {
        "Authorization": "Bearer ${PRINCIPIA_TOKEN}"
      }
    }
  }
}
extensions:
  "principia":
    enabled: true
    name: "principia"
    type: streamable_http
    uri: "https://peopleprincipia.com/api/mcp"
    headers:
      "Authorization": "Bearer ${PRINCIPIA_TOKEN}"
    timeout: 300

Placeholders to fill from your own secret store: ${PRINCIPIA_TOKEN}. The registry never accepts secret values.

Quality – / 100not scored

Not scored: fewer than three checks apply, usually because no remote answered a credential-free probe or the server is a local package.

protocol75 · weight 25
  • warn
    protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
  • n/a
    protocol.statelessonly applies to 2026-07-28 servers
  • pass
    protocol.transportstreamable HTTP
  • n/a
    protocol.list_ttlonly applies to 2026-07-28 servers
authorizationn/a · weight 15
  • n/a
    auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
  • n/a
    auth.secret_in_urlno templated URL
tool hygienen/a · weight 30
  • n/a
    tools.descriptions, tools.description_length, tools.schemas, tools.annotations, tools.directory_hints, tools.token_cost, tools.api_dumptool list unknown (behind auth, not probed, or empty)
stabilityn/a · weight 15
  • n/a
    stability.changes, stability.rug_pulltool list unknown
dependenciesn/a · weight 15
  • n/a
    deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

Tool list unknown · tools last changed 2026-10-14 · checked 2026-10-20 23:27 UTC

Tool changes

  • principia.models.listremoved

    List Model rows (theoretical / structural frameworks).

  • principia.instruments.lookupremoved

    Lookup one instrument by instrument_id. Unknown ids return found:false.

  • principia.canonical_items.lookupremoved

    Lookup one CanonicalSurveyItem by canonical_item_id (e.g., CITM_7350938cb42d). Unknown ids return found:false.

  • principia.interventions.lookupremoved

    Look up one Intervention by `intervention_id`. Returns `{matches, total, note?}` — array-shaped for parity with critiques + equivalences. Matches list contains 0 or 1 element.

  • principia.equivalences.searchremoved

    Search InstrumentEquivalence rows by `construct_id` and/or `instrument_id`. `instrument_id` matches either side of the pair. Optional `mapping_method` filter.

  • principia.theoretical_models.lookupremoved

    Look up one CanonicalTheoreticalModel by id (e.g., theory.jd_r). Returns the theory's canonical constructs, canonical relations (with predicates), descendant per-study models, and foundational citations.

  • principia.canonical_priors.searchremoved

    Search canonical priors by from/predicate/to. Empty until PRN-021 synthesis engine ships.

  • principia.effects.searchremoved

    Search EffectSize rows by from/to/statistic_type.

  • principia.models.searchremoved

    Keyword search over model_name + description.

  • principia.items.searchremoved

    Search items by text. Restricted items (proprietary instruments) are returned with text fields stripped; restricted_count surfaces how many.

Showing the latest 10. Full history: list_changes · trend: quality JSON.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 93 / 100

provenance85
liveness100
freshness85
hygiene100

+repository +dns-namespace +website +reachable +uptime-100% ~updated-42d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remoteauthreachableuptime 30dp50protocollast ok
https://peopleprincipia.com/api/mcp streamable-httpapi_key ${PRINCIPIA_TOKEN}yes100%241 ms2025-11-252026-10-20

Tools (0)

No tools observed. Tools appear once a credential-free probe can list them.

Schemas: list_tools.

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Official server.json
{
  "name": "com.peopleprincipia/principia",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://peopleprincipia.com/api/mcp",
      "type": "streamable-http",
      "headers": [
        {
          "name": "Authorization",
          "isSecret": true,
          "isRequired": true,
          "description": "Bearer <key>. A free researcher tier exists (PRN-186) — request a key through the contact route on https://peopleanalyst.com. Every tool is read-only against the registry except principia.competency.state.* and principia.posterior.update, which write to caller-scoped state only."
        }
      ]
    }
  ],
  "version": "1",
  "repository": {
    "url": "https://github.com/people-analyst/principia",
    "source": "github"
  },
  "websiteUrl": "https://peopleprincipia.com",
  "description": "Source-graded registry of organizational measurement: constructs, priors, instruments, citations."
}