Reference

ctx_preload

Input contract and parameters for ctx_preload.

Status by featureReviewed September 2026

MCP tool · Planning tools

Call this tool through your MCP client. Its availability depends on your active configuration and profile.

This registry contract is separate from the SDK. For terminal commands, use the CLI reference.

Parameters

Generated from the registered input schema. “Required” reflects the schema; individual actions can impose additional requirements.

pathstring

Project root

taskstringRequired

Task description (short English)

Exact JSON schema

Inspect the complete input schema

{
  "properties": {
    "path": {
      "description": "Project root",
      "type": "string"
    },
    "task": {
      "description": "Task description (short English)",
      "type": "string"
    }
  },
  "required": [
    "task"
  ],
  "type": "object"
}

Runtime description

The following is the tool's own agent-facing description, reproduced from the reviewed registry. It can contain implementation terminology; it does not expand the public stability commitment.

Read the agent-facing description

Caches task-relevant files, returns L-curve-optimized summary.
WORKFLOW: call at session start or when switching tasks, before ctx_read.
ANTIPATTERN: not for reading individual files — use ctx_read instead.
~50-100 tokens vs ~5000 for individual reads (~50x savings).

Sources & versions3 references Reviewed 18 Sept 2026

mcp_manifest.rsrust/src/core/mcp_manifest.rsReviewed checkout
registry.rsrust/src/server/registry.rsReviewed checkout
dynamic_tools.rsrust/src/server/dynamic_tools.rsReviewed checkout

Core checkout: 50fbff09c9
Installed runtime: 3.10.2
SDK release: 1.1.0

Separate baselines for source, CLI/configuration and SDK contracts. Review does not certify every platform or integration.

Versions & compatibility