cycles-mcp-server
Runtime budget authority for autonomous agents - a set of tools to check, reserve, spend, and release budget before and after every costly, risky operation. The agent asks "can I afford this?" before acting, and reports what it actually used afterward.
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runcycles
Source: Glama · also listed on npm
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The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
cycles_check_balanceCheck current budget balance for a scope. Returns remaining, reserved, spent, allocated, and debt amounts. At least one subject filter (tenant, workspace, app, workflow, agent, or toolset) is required. Do not use as a substitute for cycles_reserve — balances can change between check and action.
cycles_commitCommit actual usage after an operation completes. Always call this after cycles_reserve whether the operation succeeded or failed. Finalizes the budget charge and releases any unused reserved amount back to the pool.
cycles_create_eventRecord a usage event directly without the reserve/commit lifecycle. Use for fire-and-forget metering of completed operations where pre-estimation is not available. The event is applied atomically to all derived scopes.
cycles_decideLightweight preflight check — ask whether an action would be allowed without reserving budget. Does not create a reservation. Use at workflow start to decide strategy. For concurrency-safe budget locking, use cycles_reserve instead.
cycles_extendExtend the TTL of an active reservation. Use as a heartbeat for long-running operations to prevent the reservation from expiring. Does not change the reserved amount.
cycles_get_reservationGet details of a specific reservation by ID. Returns status, subject, action, reserved amount, timestamps, and affected scopes. Useful for debugging and monitoring long-running operations.
cycles_list_reservationsList reservations, optionally filtered by status (ACTIVE, COMMITTED, RELEASED, EXPIRED) or subject fields. Useful for debugging stuck reservations or auditing budget usage.
cycles_releaseRelease a reservation without committing. Use when an operation is cancelled, skipped, or fails before execution. Returns the released budget amount back to the pool.
cycles_reserveReserve budget before a costly operation (LLM call, tool invocation, external action). Returns a reservation_id to commit or release later. If decision is not ALLOW, do not proceed with the operation. For lightweight preflight checks without reserving, use cycles_decide instead.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
CYCLES_MOCK"": "true"PORTTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
9/9 tools missing one or more hints — cycles_check_balance (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); cycles_commit (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); cycles_create_event (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +6 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool inputs are validated
Only 0/9 tool handlers declare input schemas (0%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.12.1 (high), @modelcontextprotocol/sdk@1.12.1 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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