Read a Runtime documentation page as Markdown: the same text as https://withruntime.com/docs. Topics include start, javascript, python, cli, mcp, api, sandbox-environment, migrate, pricing and troubleshooting.
| Name | Required | Description | Default |
|---|---|---|---|
| topic | Yes | The page: start, cli, mcp, pricing and so on. |
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+ "api",
+ "aws-lambda-microvms-alternative",
+ "blaxel-alternative",
+ "changelog",
+ "choosing-agent-sandbox",
+ "claude-managed-agents",
+ "cli",
+ "cloudflare-sandbox-alternative",
+ "codesandbox-alternative",
+ "company-rollout",
+ "computesdk",
+ "daytona-alternative",
+ "e2b-alternative",
+ "editors",
+ "feedback-and-support",
+ "fly-alternative",
+ "frameworks",
+ "freestyle-alternative",
+ "harbor",
+ "identity-tokens",
+ "images",
+ "inspect",
+ "javascript",
+ "langchain",
+ "mcp",
+ "migrate",
+ "modal-sandbox-alternative",
+ "morph-alternative",
+ "networking",
+ "northflank-alternative",
+ "observability",
+ "openai-agents-sdk",
+ "pricing",
+ "prime-sandboxes-alternative",
+ "products",
+ "python",
+ "referrals",
+ "runloop-alternative",
+ "sandbox-environment",
+ "security",
+ "single-sign-on",
+ "speed",
+ "start",
+ "storage",
+ "teams",
+ "trial",
+ "troubleshooting",
+ "trust",
+ "vercel-ai-sdk",
+ "vercel-sandbox-alternative"
+]Input schema / properties / topic / enumPrevious value: -[
- "api",
- "aws-lambda-microvms-alternative",
- "blaxel-alternative",
- "changelog",
- "choosing-agent-sandbox",
- "claude-managed-agents",
- "cli",
- "cloudflare-sandbox-alternative",
- "codesandbox-alternative",
- "computesdk",
- "daytona-alternative",
- "e2b-alternative",
- "editors",
- "feedback-and-support",
- "fly-alternative",
- "frameworks",
- "freestyle-alternative",
- "harbor",
- "identity-tokens",
- "images",
- "inspect",
- "javascript",
- "langchain",
- "mcp",
- "migrate",
- "modal-sandbox-alternative",
- "morph-alternative",
- "networking",
- "northflank-alternative",
- "observability",
- "openai-agents-sdk",
- "pricing",
- "prime-sandboxes-alternative",
- "products",
- "python",
- "referrals",
- "runloop-alternative",
- "sandbox-environment",
- "security",
- "single-sign-on",
- "speed",
- "start",
- "storage",
- "teams",
- "trial",
- "troubleshooting",
- "vercel-ai-sdk",
- "vercel-sandbox-alternative"
-]New value: +[
+ "api",
+ "aws-lambda-microvms-alternative",
+ "blaxel-alternative",
+ "changelog",
+ "choosing-agent-sandbox",
+ "claude-managed-agents",
+ "cli",
+ "cloudflare-sandbox-alternative",
+ "codesandbox-alternative",
+ "company-rollout",
+ "computesdk",
+ "daytona-alternative",
+ "e2b-alternative",
+ "editors",
+ "feedback-and-support",
+ "fly-alternative",
+ "frameworks",
+ "freestyle-alternative",
+ "harbor",
+ "identity-tokens",
+ "images",
+ "inspect",
+ "javascript",
+ "langchain",
+ "mcp",
+ "migrate",
+ "modal-sandbox-alternative",
+ "morph-alternative",
+ "networking",
+ "northflank-alternative",
+ "observability",
+ "openai-agents-sdk",
+ "pricing",
+ "prime-sandboxes-alternative",
+ "products",
+ "python",
+ "referrals",
+ "runloop-alternative",
+ "sandbox-environment",
+ "security",
+ "single-sign-on",
+ "speed",
+ "start",
+ "storage",
+ "teams",
+ "trial",
+ "troubleshooting",
+ "vercel-ai-sdk",
+ "vercel-sandbox-alternative"
+]Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover safety (readOnlyHint, openWorldHint=false, destructiveHint=false), so the bar is lower. The description still adds real value by disclosing the return format (Markdown) and fidelity ('the same text as https://withruntime.com/docs'), which is the main behavioral question for a docs tool. It stops short of stating caching, auth, or length constraints.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences, zero filler, and the core action plus source is front-loaded before the topic examples. The topic enumeration is somewhat duplicative of the enum and could be trimmed, but it aids fast scanning.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a single-parameter read tool with no output schema, the description covers what is returned and what can be requested; the remaining gap is only the 'when to use it' routing, which belongs to usage guidance rather than completeness.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% and the topic parameter has a full 57-value enum, so the schema already carries the semantics. The description echoes a subset of those values ('start, javascript, python, cli, mcp, api...'), which is redundant rather than additive; no extra meaning (case sensitivity, aliases, fallback behavior for an invalid topic) is provided.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
States a specific verb and resource ('Read a Runtime documentation page as Markdown') and identifies the source URL, so the agent knows exactly what comes back. It does not need to name siblings because none of the runtime_* tools are documentation readers, but it also never explicitly says so.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Usage is implied by the topic list (start, migrate, pricing, troubleshooting), which hints at when to reach for it, but there is no explicit 'use this when' or 'prefer this over runtime_support' guidance. The agent must infer the trigger condition.
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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