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## Agent Trading Cards "Create Agent Card" action in the agent panel that mints an AI-generated trading card PNG which **is** the agent: the card carries the `buzz_agent_snapshot` tEXt chunk and is drag-in importable like any snapshot PNG. ### What's in here - **Mint pipeline (Rust):** one OpenAI Responses call — `gpt-5.6-sol` as card designer with `gpt-image-2` via the `image_generation` tool (~2–3 min). New `mint_agent_card` / `save_agent_card` commands; preview with reroll; save or send as `.agent.png` with round-trip verification before any bytes leave the app. - **Snapshot/chunk work stays in Rust,** reusing the existing encoder/decoder seams (byte-compat golden vector proves the plain path is identical to the pre-envelope encoder for placeholder, PNG-injection, and JPEG-transcode paths). - **Locked cards (NIP-44):** optional `buzz-agent-snapshot-encrypted` envelope encrypted to the (owner, agent) pair. `parse_canonical_pubkey` performs lift-x curve validation before any API spend; wrong-key decrypt returns a fixed refusal; the plain decoder refuses locked cards. - **Guardrails:** 10 MiB ceiling on final bytes, memory structurally `none` in the snapshot, full-manifest import disclosure, API-key hygiene via env layering (record > persona > global > process), fail-early validation ordering (all key/lock/NIP-44-cap checks before Responses spend). - **Import side:** full-manifest disclosure dialog, locked-card import disclosure, bounded avatar fetch. ### Review Code reviewed by Wren across the full arc; final locked-card cross-review **APPROVED 9/9/9** at exactly this head (`64f819dc8`), with independent same-SHA verification: Rust lib 1,843/1,843, clippy `--all-targets -D warnings`, desktop file-size gate. ### Live-mint evidence (real API, shipping seams, this SHA) - **Plain (Honey):** 188s, 1500x2250, 5,101,503 bytes (< 10 MiB); decoded manifest == built manifest; memory=none. - **Locked (Fizz):** 176s, 4,670,184 bytes; owner-key and agent-key decrypt both verified via logical manifest compare; wrong-key refusal exact; plain decoder refuses. - **Live finding:** built-in agents' ~171 KB inline avatars exceed the NIP-44 65,535-byte plaintext cap and the fail-early guard fires before API spend — clean error path, noted as a UX follow-up for large-avatar agents choosing lock. Full evidence (cards + dialog screenshots) posted in the originating thread. --------- Signed-off-by: Tyler Longwell <tlongwell@block.xyz> Signed-off-by: npub12gtutshhh76rx0jx697f32f9tffd4hhp3hx58fp4x6u4uemkm7sqf8f757 <5217c5c2f7bfb4333e46d17c98a9255a52dadee18dcd43a43536b95e6776dfa0@buzz.block.builderlab.xyz> Signed-off-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> Co-authored-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> Co-authored-by: Tyler Longwell <tlongwell@block.xyz> Co-authored-by: npub12gtutshhh76rx0jx697f32f9tffd4hhp3hx58fp4x6u4uemkm7sqf8f757 <5217c5c2f7bfb4333e46d17c98a9255a52dadee18dcd43a43536b95e6776dfa0@buzz.block.builderlab.xyz>
