abap-adt-mcp

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adt_write_function_module_source

Edit an existing function module's ABAP source code with lock, write, unlock, and optional activation. Accepts FUNCTION ... ENDFUNCTION format, auto-normalized for ADT.

Instructions

Edit an existing function module's source (lock -> write -> unlock -> optional activate). Accepts the classic FUNCTION z_fm. ... ENDFUNCTION. form or the normalized form; it is auto-normalized to what ADT accepts. Blocked in read-only mode; name must match the Z*/Y* prefix. For a first-time create use adt_create_function_module instead.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "functionModule": "<functionModule>",
      "source": "<source>"
    },
    "name": "adt_write_function_module_source"
  }
}

Input Schema

Name	Required	Description
`source`	Yes	New full function module ABAP source (FUNCTION ... ENDFUNCTION).
`activate`	No	Activate after writing. Default true.
`transport`	No	Transport request. Omit + non-$TMP object -> asked to create one.
`functionGroup`	No	Owning function group. Omit to auto-resolve via search.
`functionModule`	Yes	Function module name, e.g. ZMY_FM

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Jul 28, 2026

TDQS

A4.5/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations, so description carries full burden. Discloses the lock-write-unlock-activate process, auto-normalization, and read-only blocking. Does not detail transport handling or error states.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Concise paragraph covering purpose, process, constraints, and sibling reference. No redundant sentences. Efficiently communicates key points.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers core behavior but lacks mention of return values or output (no output schema). Adequate for an edit tool, but could be more complete for an AI agent expecting result confirmation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, and description adds practical context: source format normalization, transport auto-creation, function group auto-resolve. Enhances understanding beyond schema descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states the purpose: edit an existing function module's source. Distinguishes from create tool (adt_create_function_module). Describes the process and constraints.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly advises using adt_create_function_module for first-time create. Mentions read-only blocking. Lacks comparison to sibling adt_write_source but provides clear context for when to use this tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.