Glean Security Basics

What it does

When your agent uses it

• Backend & APIs work in your project

Example prompts

• “glean security basics”
• “security-basics”
• “/glean-security-basics”

Requirements

• A credential in GLEAN_INDEXING_TOKEN
• A credential in GLEAN_CLIENT_TOKEN
• Compatibility (from SKILL.md): Designed for Claude Code
• Pre-approved tools (allowed-tools): Read, Write, Edit, Bash(npm:*), Bash(curl:*), Grep

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Scope credentials by environment and datasource, inject them from the secret manager, and deny unknown scope or destination.
2. 2Validate document schema, size, origin, and ACL before indexing; quarantine failures with opaque correlation IDs.
3. 3Verify webhook authenticity before parsing, validate comparable lengths before constant-time comparison, and reject replayed or stale…
4. 4Run synthetic allow and deny probes after ACL or identity changes, logging policy revisions and aggregates rather than content.
5. 5Rotate or revoke compromised credentials, disable a connector if integrity is uncertain, and preserve redacted incident evidence.

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Write
  • Edit
  • Bash(npm:*)
  • Bash(curl:*)
  • Grep

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • developers.glean.com
  • owasp.org

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • GLEAN_INDEXING_TOKEN
  • GLEAN_CLIENT_TOKEN
  • GLEAN_WEBHOOK_SECRET

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Designed for Claude Code

  From compatibility in the SKILL.md frontmatter.

Context cost

Glean Security Basics loads about 1.5k tokens when it runs. Until then it costs about 38 tokens; SKILL.md has 401 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~38

When it runs · the whole SKILL.md, loaded when a task matches

~1.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 401 words, ~1,485 tokens.

name

glean-security-basics

description

Token security: Indexing tokens have write access -- never expose in frontend. Trigger: "glean security basics", "security-basics".

allowed-tools

Read, Write, Edit, Bash(npm:*), Bash(curl:*), Grep

compatibility

Designed for Claude Code

version

1.8.0

license

MIT

author

Jeremy Longshore <jeremy@intentsolutions.io>

tags

saas, enterprise-search, glean

function createGleanClient(tokenType: "indexing" | "client"): { token: string; baseUrl: string } {
  const token = tokenType === "indexing"
    ? process.env.GLEAN_INDEXING_TOKEN
    : process.env.GLEAN_CLIENT_TOKEN;
  if (!token) {
    throw new Error(`Missing GLEAN_${tokenType.toUpperCase()}_TOKEN — store in secrets manager`);
  }
  // Indexing tokens have WRITE access — never expose in frontend code
  if (tokenType === "indexing") {
    console.log("WARNING: Indexing token loaded — backend use only");
  }
  return { token, baseUrl: `https://${process.env.GLEAN_INSTANCE}.glean.com/api` };
}

import crypto from "crypto";
import { Request, Response, NextFunction } from "express";

function verifyGleanWebhook(req: Request, res: Response, next: NextFunction): void {
  const signature = req.headers["x-glean-signature"] as string;
  const secret = process.env.GLEAN_WEBHOOK_SECRET!;
  const expected = crypto.createHmac("sha256", secret).update(req.body).digest("hex");
  if (!signature || !crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected))) {
    res.status(401).send("Invalid signature");
    return;
  }
  next();
}

import { z } from "zod";

const IndexDocumentSchema = z.object({
  datasource: z.string().min(1).max(100),
  document_id: z.string().min(1).max(500),
  title: z.string().min(1).max(500),
  body: z.string().max(1_000_000),
  allowed_users: z.array(z.string().email()).optional(),
  allowed_groups: z.array(z.string()).optional(),
  permissions_type: z.enum(["public", "restricted", "private"]).default("restricted"),
});

function validateIndexDocument(data: unknown) {
  return IndexDocumentSchema.parse(data);
}

const GLEAN_SENSITIVE_FIELDS = ["indexing_token", "client_token", "document_body", "user_query", "search_results"];

function redactGleanLog(record: Record<string, unknown>): Record<string, unknown> {
  const redacted = { ...record };
  for (const field of GLEAN_SENSITIVE_FIELDS) {
    if (field in redacted) redacted[field] = "[REDACTED]";
  }
  return redacted;
}

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/.curated/glean-security-basics of jeremylongshore/tons-of-skills-marketplace.

Open the folder on GitHubat commit cfae287