IndyKite MCP Server

The IndyKite MCP server lets an AI agent make authorization decisions - "can this subject do X on Y?" (AuthZEN/KBAC) - and read or write the IndyKite Graph (ContX IQ), directly through the Model Context Protocol instead of bespoke REST calls. It speaks JSON-RPC over HTTP POST. This skill uses the stateless protocol (revision 2026-07-28 and later): no initialize/initialized handshake and no Mcp-Session-Id - every request is self-contained, carrying the protocol metadata in params._meta plus the standard MCP headers. Older revisions (e.g. 2025-11-25) use a session handshake instead; that legacy style is summarized in [references/architecture.md](references/architecture.md).

Two regional endpoints exist:

• EU: https://eu.mcp.indykite.com
• US: https://us.mcp.indykite.com

The full URL for one project is <MCPREGIONALURL>/mcp/v1/<project_gid>.

When to use

Activate this skill when the user:

• needs to call the IndyKite MCP server (discover its capabilities, list tools/resources, or call AuthZEN/CIQ tools);
• is configuring an MCP server for a project (POST /configs/v1/mcp-servers) and needs the field set;
• is debugging a 401 that returned .well-known/oauth-protected-resource metadata - almost always a missing, expired, or wrongly-bound Authorization: Bearer token;
• is wiring an LLM client (Claude Code, Cursor, Goose, the MCP Go SDK, etc.) into the IndyKite MCP and needs the request shape;
• is choosing between authzenevaluate, authzenevaluations, authzensearchresource, authzensearchaction, and ciq_execute.

Do not activate this skill when the user:

• is asking about the IndyKite Agent Gateway (use the [indykite-agent-gateway](../indykite-agent-gateway/SKILL.md) skill - IAG protects A2A agents or MCP servers behind a gateway, a different product);
• is calling AuthZEN or ContX IQ over their direct REST APIs (no MCP involved) - different endpoints, different auth shape;
• is asking about the MCP specification itself rather than the IndyKite implementation.

Prerequisites

The MCP server will reject requests for a project until all of the following exist:

• An IndyKite project with an Application and an AppAgent (with Authorization API + ContX IQ API permissions). The server uses this AppAgent to call IndyKite APIs at runtime, resolved server-side from the MCP server configuration's appagentid - the client no longer sends an AppAgent token.
• A Token Introspect configuration on the project - used to validate inbound user Bearer tokens.
• An MCP server configuration (POST /configs/v1/mcp-servers) that binds the runtime endpoint to the AppAgent (appagentid) and Token Introspect, and declares scopes_supported. Without this configuration, requests for the project are rejected. See [references/configuration.md](references/configuration.md).
• The project's GID (used in the URL path).
• Captured data and policies: KBAC and/or CIQ policies and Knowledge Queries, depending on which tools the agent will call.

If any of these are missing, stop and tell the user - fixing them first is much cheaper than debugging an opaque MCP rejection.

The stateless request shape

Every request in this skill carries the same scaffolding; only the method and its payload change.

In the body, a params._meta object:

"_meta": {
  "io.modelcontextprotocol/protocolVersion": "2026-07-28",
  "io.modelcontextprotocol/clientCapabilities": {},
  "io.modelcontextprotocol/clientInfo": {"name": "curl", "version": "1.0"}
}

The protocolVersion key is required - a request without it is treated as legacy session-based and will fail with 404 session not found. clientCapabilities is required ({} if none); clientInfo is optional.

In the headers:

No session is created and no Mcp-Session-Id header comes back. If a mixed-version client sends a stale Mcp-Session-Id alongside a 2026-07-28 meta, the meta wins and the header is ignored.

The helper [scripts/mcp-call.sh](scripts/mcp-call.sh) assembles all of this for any method.

Steps

1. Resolve the URL and credentials

Build the full MCP URL: <MCPURL>/mcp/v1/<projectgid> where <MCP_URL> is https://eu.mcp.indykite.com or https://us.mcp.indykite.com. Get the values into shell variables:

export BEARER_TOKEN="<user-OAuth-access-token>"   # → Authorization: Bearer
export MCP_URL="https://us.mcp.indykite.com"
export PROJECT_GID="<your-project-gid>"

A single Authorization: Bearer header is the only auth header on every call. The AppAgent the server uses to call IndyKite APIs at runtime is resolved server-side from the MCP server configuration's appagentid - clients no longer send an X-IK-ClientKey AppAgent token. See [references/architecture.md](references/architecture.md) for the rationale (the Bearer token identifies the user as the AuthZEN subject).

2. Probe the server with server/discover (optional but recommended)

The stateless protocol adds a server/discover method that returns the server's capabilities and the protocol revisions it accepts - use it to confirm the endpoint speaks 2026-07-28 before anything else:

curl -s -i -X POST "$MCP_URL/mcp/v1/$PROJECT_GID" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "Authorization: Bearer $BEARER_TOKEN" \
  -H "Mcp-Protocol-Version: 2026-07-28" \
  -H "Mcp-Method: server/discover" \
  -d '{
        "jsonrpc": "2.0",
        "id": 1,
        "method": "server/discover",
        "params": {
          "_meta": {
            "io.modelcontextprotocol/protocolVersion": "2026-07-28",
            "io.modelcontextprotocol/clientCapabilities": {},
            "io.modelcontextprotocol/clientInfo": {"name": "curl", "version": "1.0"}
          }
        }
      }'

The response is 200 with result.supportedVersions (e.g. ["2026-07-28", "2024-11-05", …]), result.capabilities, and the server's instructions - and no Mcp-Session-Id header. Or run scripts/mcp-call.sh server/discover.

3. Discover tools and resources

Before calling tools, ask the server what's available. Three useful methods (each a self-contained POST with the same _meta and headers, changing Mcp-Method):

• tools/list - what tools the agent may call (the canonical set is in [references/tools.md](references/tools.md), but list it to verify what this deployment exposes).
• resources/list - what resources the MCP server exposes.
• resources/read with uri: "indykite://knowledge-queries/" (also sent as the Mcp-Name header) - agent-friendly descriptions of every CIQ Knowledge Query, including the parameters each one expects.

The third one is especially important before any ciqexecute call: it tells the agent which id to pass and what inputparams shape the query expects.

scripts/mcp-call.sh tools/list
scripts/mcp-call.sh resources/read 'indykite://knowledge-queries/'

4. Call AuthZEN tools

For authorization decisions, pick the right tool for the question:

Each tool is invoked through the MCP tools/call method with name and arguments in params next to meta, plus the Mcp-Method: tools/call and Mcp-Name: <tool name> headers. Schemas and one-call examples are in [references/tools.md](references/tools.md). One non-obvious convention: when the subject is the authenticated caller, subjectid is the sub claim of the Bearer token, not a separately-supplied user identifier.

scripts/mcp-call.sh tools/call authzen_evaluate \
  '{"subject_type":"Person","subject_id":"alice","resource_type":"Car","resource_id":"cadillacv16","action_name":"CAN_DRIVE"}'

5. Call CIQ tools

ciq_execute runs a Knowledge Query against the IndyKite Graph (read or write). Two arguments:

• id - GID or name of the Knowledge Query to run.
• input_params - the partial parameters from the Knowledge Query and its policy; the exact set is documented in the query's description.

Always discover queries first via resources/read on indykite://knowledge-queries/ so the agent passes the right parameters.

6. Read, interpret, and audit responses

Responses may arrive either as plain JSON or as an SSE stream (that is what the Accept: application/json, text/event-stream header allows) - in the SSE case the JSON-RPC message is in the data: line of the event. The JSON-RPC response echoes the request's id, with result on success or error on failure. For AuthZEN, the meaningful payload is a text content item in result.content whose body holds the JSON decision; for CIQ, it is the rows the query returned. Service-side errors (configuration broken, scopes missing) usually surface as JSON-RPC error objects; a protocol revision the server does not support returns 400 with error code -32022 naming the requested and supported versions; transport problems (auth, connectivity) come back as HTTP 4xx/5xx before JSON-RPC even runs - see [references/troubleshooting.md](references/troubleshooting.md).

Legacy session-based clients

Protocol revisions before 2026-07-28 (e.g. 2025-11-25) use a session handshake: initialize → capture the Mcp-Session-Id response header → notifications/initialized → send the header on every call. Both styles authenticate the same way and expose the same tools and resources; only use the legacy style when the client library cannot send the _meta-based requests. The lifecycle and rules are in [references/architecture.md](references/architecture.md).

Outcome

When this skill has been applied successfully:

• An MCP server configuration exists for the project (with appagentid set) and enabled is true.
• The agent has BEARER_TOKEN (user OAuth access token) in scope and sends it as the sole Authorization: Bearer auth header.
• server/discover returns 2026-07-28 among result.supportedVersions, and no Mcp-Session-Id header appears on any response.
• tools/list and resources/read on indykite://knowledge-queries/ enumerate what the agent can call.
• AuthZEN decisions and CIQ query results come back over JSON-RPC and the agent uses them in its workflow.

Files in this skill

• [references/architecture.md](references/architecture.md) - protocol styles (stateless 2026-07-28 vs legacy sessions), single Bearer-token auth with server-side AppAgent resolution, RFC 9728 401 behavior.
• [references/configuration.md](references/configuration.md) - POST /configs/v1/mcp-servers field reference and example payload.
• [references/tools.md](references/tools.md) - schemas and examples for every AuthZEN and CIQ tool.
• [references/troubleshooting.md](references/troubleshooting.md) - symptom-to-cause map.
• [scripts/mcp-call.sh](scripts/mcp-call.sh) - Bash helper that makes one stateless MCP call (builds the meta object and MCP headers for any method). Requires MCPURL, PROJECTGID, BEARERTOKEN in the environment, and curl on PATH.

Agent-specific notes

This skill uses generic markdown instructions and works across all agents listed in the [README](../README.md). It assumes the agent can issue HTTP requests (Bash + curl, an HTTP MCP client, or an SDK such as the MCP Go SDK). No Claude Code hooks, Cursor @-mentions, or Copilot workspace context are required.

References

• How to use the MCP server (IndyKite developer hub)
• Model Context Protocol specification
• MCP Go SDK
• POST /mcp-servers API reference
• POST /token-introspects API reference
• POST /application-agent-credentials API reference
• RFC 9728 - Protected Resource Metadata