update_md_section

SERVERMeridian SOURCE@meridianmcp/mcp

Medium RISK CLASS

Category Write

Parameters 83 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-ajc3xc-meridian/update-md-section.md

WHAT IT DOES

What update_md_section does on Meridian

AI agents use update_md_section to create or update resources in Meridian, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Meridian environment.

Parameter	Type	Required	Description
`file`	string	Yes	CLAUDE.md \| AGENTS.md
`force`	boolean	—	Human planning sessions pass true to apply directly without HITL. Default false.
`anchor`	string	Yes
`content`	string	Yes	Full proposed body for the section.
`urgency`	string	—
`project_id`	string	—
`session_id`	string	—
`project_name`	string	—	Project name — an alternative to project_id; resolved to the id internally. project_id wins if both are given.

Parameters from the server's own tool schema.

RISK

Why update_md_section is rated Medium

This tool creates or modifies documentation files reversibly through a staged process (normally HITL-gated, sometimes direct). While it does write files, the changes are part of a version-controlled checkpoint system and can be reviewed/reverted, making it Write rather than Destructive.

From the tool's definition Tool description states it 'Propose a replacement for an anchored section' and 'Meridian replaces that section and stages the file for the next checkpoint commit.' This modifies documentation files (CLAUDE.md or AGENTS.md) with new content.

Risk signalsAccepts file system path (file) · Accepts raw HTML/template content (content)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_md_section safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Meridian, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For update_md_section, this is the rule to start with:

update_md_section Rate-limited

update_md_section stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_md_section": {
      "limits": [
        {
          "counter": "update_md_section_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Meridian, apply this rule, and every update_md_section call is checked against it from then on.

FAQ

Questions about update_md_section

What does the update_md_section tool do? +

[MAINTENANCE] Propose a replacement for an anchored section of an agent template doc (CLAUDE.md or AGENTS.md). Does NOT write the file directly — it creates a human-in-the-loop request carrying a diff preview. A human approves it in the dashboard, then Meridian replaces that section and stages the file for the next checkpoint commit. 'anchor' is the section name between the MERIDIAN:ANCHOR:START/END comments. (ROADMAP/DECISIONS/DEVLOG are append-only and not replaceable.) Pass force=true from a human planning session (claude.ai) to skip the HITL and apply the replacement directly; autonomous executor sessions should omit force so the diff stays gated. Persistent-state disclosure: on hosted Meridian, supplied text and project/session metadata are sent to and stored in Meridian's service; self-hosted deployments keep them in the configured local SQLite/Postgres database. This data is visible in the dashboard/API and later project context or handoffs. Delete individual tasks, notes, or decisions where supported, or delete the project/account using the documented controls. Do not include secrets. It is categorised as a Write tool in the Meridian MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does update_md_section accept? +

update_md_section accepts 8 parameters: file, force, anchor, content, urgency, project_id, session_id, project_name. Required: file, anchor, content. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on update_md_section? +

Register the Meridian MCP server in PolicyLayer and add a rule for update_md_section: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Meridian. Nothing to install.

What risk level is update_md_section? +

update_md_section is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update_md_section? +

Yes. Add a rate_limit block to the update_md_section rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block update_md_section completely? +

Set action: deny in the PolicyLayer policy for update_md_section. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides update_md_section? +

update_md_section is provided by the Meridian MCP server (@meridianmcp/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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