agent-content-watermark-mcp 1.1.3

Agent Content Watermark MCP — dedicated EU AI Act Article 50(2) GenAI watermarking. Visible + invisible + perceptual layers per the Code of Practice (2 Nov 2026 cliff). C2PA manifest envelope. By MEOK AI Labs.

mcp-name: io.github.CSOAI-ORG/agent-content-watermark-mcp

Agent Content Watermark MCP

🧱 Part of the MEOK Governance Substrate (£499/mo)

See meok.ai/article-50-kit.

EU AI Act Article 50(2) GenAI watermarking — dedicated MCP

What this does

Article 50(2) of the EU AI Act (Regulation (EU) 2024/1689) requires providers of GenAI systems to mark outputs in a machine-readable format detectable as artificially generated.

Effective: 2 November 2026 (post-Omnibus delay).

This MCP handles the watermark side dedicatedly — distinct from the broader C2PA provenance work in watermarking-authenticity-mcp. It produces three layers per the GPAI Code of Practice:

1. Visible label — human-readable disclosure (AI-generated · <provider> · model <id>)
2. Invisible payload — modality-specific stego (F5 LSB for image, zero-width for text, spread-spectrum for audio, etc.)
3. Perceptual anchor — survives compression / crop / mild edits

Tools

Tool	Purpose
generate_watermark(content_hash, model_id, provider_did, modality)	Emit signed mark
verify_watermark(mark)	Cryptographic + perceptual verification
attach_c2pa_manifest(image_metadata, mark)	Build C2PA envelope
list_modalities()	5 supported: image · text · audio · video · code
code_of_practice_status()	Current GPAI CoP version + days until 2 Nov 2026
sign_conformity_attestation(generation_event)	Article-50 attestation for audit

Why this exists

Watermarking is one of the few Article 50 obligations that has no native tooling in most agent stacks. Providers building on Claude / GPT / Gemini are responsible — those models don't ship watermarks by default.

Missing-watermark on a generated output triggers Article 73 reporting via agent-incident-relay-mcp.

Sister MCPs

• watermarking-authenticity-mcp — broader C2PA + Article 50 + Article 73 dispatch
• eu-ai-act-compliance-mcp — Article 50 text + thresholds
• agent-incident-relay-mcp — missing-watermark incident broadcaster
• mcp-spec-compliance-mcp — ensure your own MCP server.json passes audit

Full catalogue: meok.ai/anthropic-registry

Pricing

Option	Price
Self-host MIT	£0
Universal PAYG	£29/mo + £0.0002/call
Governance Substrate	£499/mo
A2A Substrate	£999/mo
Defence	£4,990/mo

Buy: https://meok.ai/governance

Wire it up — full stack

This MCP is part of the MEOK chain that turns one agent action into a fully signed compliance event. See meok.ai/mcp-stack for the 6-MCP chain:

1. bft-progress-council-mcp — anti-loop guardrail
2. agent-token-budget-mcp — hard spend cap
3. agent-content-watermark-mcp — EU AI Act Article 50(2) watermark
4. meok-eu-aigc-icon-mcp — EU Code-of-Practice icon (Nov 2026 cliff)
5. agent-audit-logger-mcp — hash-chained audit trail
6. a2a-governance-bridge-mcp — fold all signatures into one signed event

Output: ONE auditor-defensible evidence event mapped to EU AI Act Articles 12 + 50, DORA Article 17, ISO 42001 clause 9 — plus a public verify URL.

Licence

MIT. By MEOK AI Labs (CSOAI LTD, UK Companies House 16939677).

💸 Try MEOK in 30 seconds — instant buy ladder

Tier	Price	What you get	Stripe
Smoke test	£1	Signed sample MCP-Hardening report + Article 50 PDF	https://buy.stripe.com/dRmcN75ScdQS7oh1Uc8k90U
Quick Kit	£9	EU AI Act Article 50 implementation guide (C2PA + EU-Icon)	https://buy.stripe.com/cNi00la8s1460ZT0Q88k90V
Founder Call	£29	30-min 1-on-1 with the founder	https://buy.stripe.com/8x228ta8s6oqbExaqI8k90W

Refundable. UK Stripe — VAT-clean. Builds on the 81-MCP MEOK fleet. Verify any signed report at https://meok.ai/verify.