recon

recon is a skill for Claude Code, Codex from blisspixel/recon. It costs 124 tokens per session (5,441 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

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.

agentmods
npx agentmods add skills/blisspixel/recon/recon
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.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.svg" alt="Measured on agentmods" 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 5,441 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00124 $0.05441
Opus 5 $0.00062 $0.02721
Sonnet 5 $0.00025 $0.01088
Haiku 4.5 $0.00012 $0.00544

Measured 3d ago against content hash 161a31aaa96b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 3d ago.

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 · 317 lines

How it starts

The opening of the file, as written. The whole thing — 317 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

Confirm recon is installed before the first call in a session:

recon --version

If the command is not found:

"recon-tool is not installed. It's a Python CLI from github.com/blisspixel/recon that reads public DNS, identity endpoints, and certificate transparency - no credentials needed. Install with pip install recon-tool? (Python 3.11+ required.)"

Wait for explicit approval, then pip install recon-tool followed by recon doctor to verify connectivity. If recon --version succeeds, continue immediately - do not re-prompt on subsequent calls in the same session.

Read the full file on GitHub · 317 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. 3d ago First seen · 317 lines · 124 tokens per session scan A 161a31aaa96b

Subscribe to this mod's changes

recon is a skill published in the GitHub repository blisspixel/recon (4 stars, last pushed 4d ago), licensed Apache-2.0. It adds 124 tokens to every session and 5,441 once invoked, about $0.0006 per session on Opus 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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