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nymrel
by nymrel

nymrel_sandstorm

Enforce zero-trust sandboxing for AI agents: isolate workspaces with copy-on-write, mask leaked secrets like API keys and JWTs, and cap token/financial spend to block exfiltration.

Instructions

Enforces Zero-Trust agent sandboxing: Copy-on-Write workspace isolation, secret exfiltration masking (API keys, JWTs), and token/financial spend rate-limiters.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
actionNoSandstorm security actionmask_secrets
contentNoText or code string to scan for secrets and exfiltration tokens
tokenSpendNoCurrent session token spend to compare against spend ceiling
maxTokenSpendLimitNoHard token limit (default 250,000)
Behavior3/5

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

No annotations are present, so the description carries the disclosure burden. It does add genuine behavioral traits: Copy-on-Write isolation implies source workspaces are not mutated, masking targets sensitive tokens, and spend limits cap consumption. However, it does not disclose return values, error behavior, permissions, or side effects beyond these high-level categories.

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?

The description is a single sentence, front-loaded with the main purpose and organized as a colon-separated list of three behaviors. There is no filler, repetition, or unnecessary detail.

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

Completeness3/5

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

The input schema fully documents parameters and the action enum, making the tool minimally invocable. However, with no output schema and no guidance on return format or tool selection among many nymrel_* siblings, the description is not fully complete for confident autonomous use.

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

Parameters3/5

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

Schema descriptions already cover all four parameters, so the baseline is 3. The description adds marginal context by tying 'API keys, JWTs' to content scanning and 'financial spend' to the numeric limits, but most parameter meaning already resides in the input schema.

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

Purpose4/5

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

The description names a clear verb and resource — 'Enforces Zero-Trust agent sandboxing' — and enumerates three distinct behaviors: Copy-on-Write isolation, secret exfiltration masking, and spend rate limiting. It does not explicitly differentiate this from security-related siblings such as nymrel_surety_guard, so it falls just short of full differentiation.

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

Usage Guidelines3/5

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

The capabilities imply when to use the tool: isolating workspaces, masking secrets like API keys and JWTs, or capping token/financial spend. The action enum reinforces these scenarios, but the description provides no explicit guidance on when to prefer this tool over a sibling or any 'do not use when' exclusions.

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

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