set_decision_flag

THE RISK

Medium Risk

Why set_decision_flag needs a policy

This tool updates metadata (flags/tags) on decisions within the shared knowledge base, making it a Write operation. It does not delete data (not Destructive), execute code (not Execute), or process financial transactions (not Financial).

From the tool's definition The tool performs a 'flag/tag update for an existing decision,' which modifies data stored in the persistent knowledge base. 'Update' is a write operation that changes state reversibly.

Documented attack patterns abuse exactly the kind of access set_decision_flag gives an agent:

POLICY

How to control set_decision_flag

PolicyLayer is an MCP gateway — it sits between your AI agents and Codevira MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for set_decision_flag:

policy.json

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

set_decision_flag 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.

Create a free account and register Codevira MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Codevira MCP tools

Write consensus_propose_supersession v3.1.0 M7 Phase C: Open a cross-IDE supersession proposal. Write defer_phase Move an upcoming phase to the deferred list. Write reaffirm_decision v3.2.0: refresh a do_not_revert decision Write record_skill v3.1.0 M3: Author a new skill in the canonical store Write refresh_graph Auto-generate context graph nodes for new or unregistered files. Write supersede_decision v2.1.2 Item 26: retire old_id and link to a replacement. Write supersede_skill v3.1.0 M3: Version a skill. Writes a new skill that supersedes Write add_phase Add a new upcoming phase to the roadmap.

All 48 Codevira MCP tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set_decision_flag

What does the set_decision_flag tool do? +

v3.0.0 lightweight flag/tag update for an existing decision. It is categorised as a Write tool in the Codevira MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_decision_flag? +

Register the Codevira MCP server in PolicyLayer and add a rule for set_decision_flag: 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 Codevira MCP. Nothing to install.

What risk level is set_decision_flag? +

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

Can I rate-limit set_decision_flag? +

Yes. Add a rate_limit block to the set_decision_flag 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 set_decision_flag completely? +

Set action: deny in the PolicyLayer policy for set_decision_flag. 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 set_decision_flag? +

set_decision_flag is provided by the Codevira MCP server (sachinshelke/codevira). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Codevira MCP tool call.

Start from Codevira MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →