recon

recon is a skill for Claude Code, Codex from blisspixel/recon. It costs 124 tokens per session (6,041 once invoked), scanned A, original, Apache-2.0.

A tool for learning what public online services and email protections a domain uses, based on DNS records, certificates, and identity information.

In plain words
What is it for?
Use it to identify Microsoft 365 or Google Workspace, review DMARC, DKIM, SPF, MTA-STS, and BIMI settings, fingerprint SaaS services, and find related domains.
Why use it?
It helps answer questions about a domain without credentials, active scanning, or port probing.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to identify Microsoft 365 or Google Workspace, review DMARC, DKIM, SPF, MTA-STS, and BIMI settings, fingerprint SaaS services, and find related domains.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/blisspixel/recon/recon
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add blisspixel/recon --skill recon
Clone the repo
git clone --depth 1 https://github.com/blisspixel/recon

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for recon

README.md
[![agentmods](https://agentmods.dev/badge/skills/blisspixel/recon/recon/github.svg)](https://agentmods.dev/skills/blisspixel/recon/recon)
Your own site
<a href="https://agentmods.dev/skills/blisspixel/recon/recon"><img src="https://agentmods.dev/badge/skills/blisspixel/recon/recon/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for recon

Your own site · 80×15
<a href="https://agentmods.dev/skills/blisspixel/recon/recon"><img src="https://agentmods.dev/badge/skills/blisspixel/recon/recon.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 124 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,041 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Rogue Agent · line 143
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
  • medium Excessive Agency · line 358
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00124 $0.06041
Opus 5.5 $0.00050 $0.02416
Sonnet 5.5 $0.00025 $0.01208
Haiku 4.5 $0.00012 $0.00604

Measured today against content hash 4223faec7bbc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

recon scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/agent-plugin/skills/recon/SKILL.md · 362 lines

How it starts

The opening of the file, as written. The whole thing — 362 lines — stays where its author put it; the contents beside it link to each section on GitHub.

recon

Public-metadata domain intelligence. Given an apex domain, recon returns hedged observations about that queried public namespace and its evidence-linked service and identity indicators. It uses public DNS, certificate transparency, and unauthenticated identity-discovery endpoints without credentials or API keys. Default collection performs no active scanning or port probing: authoritative DNS may observe resolver traffic, and MTA-STS is the only default target-owned HTTP/application request. Google CSE and BIMI certificate requests are explicit opt-in direct probes.

When this is the right tool

Reach for recon when the user wants to understand a domain's public-facing configuration:

  • "Is delta.invalid on Microsoft 365? What's their tenant ID?"
  • "Score the email security on gamma.invalid."
  • "What SaaS vendors does beta.invalid appear to use?"
  • "Find related domains for alpha.invalid."
  • "Compare the posture of a.invalid and b.invalid."

Do not reach for recon when the user wants:

  • Active scanning, port scans, or credentialed inventory.
  • Vulnerability assessment or exploit checks.
  • Company financials, news, hiring signals, or firmographic data.
  • Generic target-owned application crawling. The only direct target interactions are the standards-compliant mta-sts.{domain} request on the default path and the documented CSE / BIMI certificate probes when explicitly enabled.

If the user wants a verdict like "is this company secure," recon is not that tool. It surfaces observations; the user supplies the judgment.

Before first invocation

First inspect the available tools for the connected recon server. Client tool namespaces vary; identify recon by its server identity and the exposed tool names and descriptions, not a required prefix. Already-connected MCP tools are sufficient: use them without requiring a shell or running recon --version. Do not register a second server or install another runtime to use that connection.

Only for the CLI fallback, confirm recon is installed before the first command: if no shell is available, report that limitation instead of attempting a tool that the client does not expose.

Read the full file on GitHub · 362 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. today Changed 4223faec7bbc
  2. yesterday Changed · +1 lines 8617db8fe4ee
  3. 8d ago Changed 36db4afe7307
  4. 9d ago Changed 6dff19ba26da
  5. 10d ago Changed 8928ab035b08
  6. 11d ago Changed 3a4a6caa8867
  7. 12d ago Changed d5a3b386bfc8
  8. 18d ago Changed 8ded08eb98e8
  9. 20d ago Changed · +1 lines dcb9d3703697
  10. 1mo ago First seen · 360 lines · 124 tokens per session scan A 812b00e7c5dd

Subscribe to this mod's changes

recon is a skill published in the GitHub repository blisspixel/recon (5 stars, last pushed today), licensed Apache-2.0. It adds 124 tokens to every session and 6,041 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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