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.
npx agentmods add instructions/segentic-lab/periscope-mcp/agents-mdgit clone --depth 1 https://github.com/segentic-lab/periscope-mcpWrote 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.
[](https://agentmods.dev/instructions/segentic-lab/periscope-mcp/agents-md)<a href="https://agentmods.dev/instructions/segentic-lab/periscope-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/segentic-lab/periscope-mcp/agents-md.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.04571 | $0.04571 |
| Opus 5 | $0.02286 | $0.02286 |
| Sonnet 5 | $0.00914 | $0.00914 |
| Haiku 4.5 | $0.00457 | $0.00457 |
Grade C, and why
periscope-mcp AGENTS.md scanned grade C 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 6d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- Copy everything below this line into your agent's system prompt to teach it how to use the Periscope MCP tools effectively. --> The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 6d ago First seen · 317 lines · 4,571 tokens per session scan C dcd34e3a1cae
periscope-mcp AGENTS.md is an instructions file published in the GitHub repository segentic-lab/periscope-mcp (10 stars, last pushed 1mo ago), licensed AGPL-3.0. It adds 4,571 tokens to every session, about $0.0229 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
browser-agent AGENTS.md
Instructions for uiuing/browser-agent, covering agents.md — guide for ai coding agents, setup & commands, tests — run these before claiming done, repository layout and architecture invariants (do not break these).
browsercontrol AGENTS.md
Instructions for adityasasidhar/browsercontrol, covering repository guidelines, project structure & module organization, build, test, and development commands, coding style & naming conventions and testing & tool changes.
mcp-server-uiautomation testing-strategy.instructions.md
Instructions for trsdn/mcp-server-uiautomation: Use the smallest relevant verification step.
DarwinRelay AGENTS.md
AGENTS.md instructions for dcierra/DarwinRelay, covering agents.md, what darwinrelay is, read these files first, repository map and canonical identities.
vibe-mcp AGENTS.md
Instructions for VibeTechnologies/vibe-mcp, covering vibe-mcp agent memory, canonical eval reference, relay and connection semantics, what counts as real e2e and fake extension test harness rules.
claude-browser-test-skills CLAUDE.md
Instructions for Autodesk/claude-browser-test-skills, covering claude.md, what this repo is, layout, conventions when editing skills and validate before publishing.