api-recon-and-docs

api-recon-and-docs is a skill for Claude Code, Codex from JustineDevs/premortem. It costs 38 tokens per session (451 once invoked), scanned A, a copy of api-recon-and-docs, Apache-2.0.

A security playbook for mapping an application programming interface, or API—the endpoints and data rules a program exposes to other software. It focuses on finding documented, hidden, and older API paths before testing them.

In plain words
What is it for?
Reviewing REST, mobile, or GraphQL APIs; finding schemas and documentation; checking client-side code for endpoints; and routing findings to authorization or authentication testing.
Why use it?
It helps reveal the API’s full surface area, including optional fields, role differences, old versions, and undocumented parameters that basic documentation may miss.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Good fit Reviewing REST, mobile, or GraphQL APIs; finding schemas and documentation; checking client-side code for endpoints; and routing findings to authorization or authentication testing.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/justinedevs/premortem/api-recon-and-docs
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 JustineDevs/premortem --skill api-recon-and-docs
Clone the repo
git clone --depth 1 https://github.com/JustineDevs/premortem

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 api-recon-and-docs

README.md
[![agentmods](https://agentmods.dev/badge/skills/justinedevs/premortem/api-recon-and-docs/github.svg)](https://agentmods.dev/skills/justinedevs/premortem/api-recon-and-docs)
Your own site
<a href="https://agentmods.dev/skills/justinedevs/premortem/api-recon-and-docs"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/api-recon-and-docs/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 api-recon-and-docs

Your own site · 80×15
<a href="https://agentmods.dev/skills/justinedevs/premortem/api-recon-and-docs"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/api-recon-and-docs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 451 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod 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 $0.00038 $0.00451
Opus 5 $0.00019 $0.00226
Sonnet 5 $0.00008 $0.00090
Haiku 4.5 $0.00004 $0.00045

Measured 8d ago against content hash eeb0dce2b9ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

api-recon-and-docs scanned grade A with 1 finding 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 8d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl https://target/app.js | grep -oE '(/api|/rest|/graphql)[^"'\'' ]+' | sort -u
Origin

This is a copy

100% identical to api-recon-and-docs — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/api-recon-and-docs/SKILL.md · 61 lines

What it actually says

SKILL: API Recon and Docs — Endpoints, Schemas, and Version Surface

AI LOAD INSTRUCTION: Use this skill first when the target is a REST, mobile, or GraphQL API and you need to enumerate endpoints, documentation, versions, and hidden surface area before exploitation.

1. PRIMARY GOALS

  1. Discover all reachable API entrypoints.
  2. Extract schemas, optional fields, and role differences.
  3. Identify old versions, mobile paths, GraphQL endpoints, and undocumented parameters.

2. RECON CHECKLIST

JavaScript and client mining

curl https://target/app.js | grep -oE '(/api|/rest|/graphql)[^"'\'' ]+' | sort -u

Common documentation and schema paths

/swagger.json
/openapi.json
/api-docs
/docs
/.well-known/
/graphql
/gql

Version and product drift

/api/v1/
/api/v2/
/api/mobile/v1/
/legacy/

3. WHAT TO EXTRACT FROM DOCS

  • optional and undocumented fields
  • admin-only request examples
  • deprecated endpoints that may still be active
  • schema hints like additionalProperties: true
  • parameter names tied to filtering, sorting, IDs, roles, or tenancy

4. NEXT ROUTING

Finding Next Skill
object IDs everywhere api authorization and bola
JWT, OAuth, role claims api auth and jwt abuse
GraphQL or hidden fields graphql and hidden parameters
strong auth boundary but suspicious business flow business logic vulnerabilities
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. 8d ago First seen · 61 lines · 38 tokens per session scan A eeb0dce2b9ed

Subscribe to this mod's changes

api-recon-and-docs is a skill published in the GitHub repository JustineDevs/premortem (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 38 tokens to every session and 451 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to api-recon-and-docs, differing in 0 lines, and is treated as a copy.

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