{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:LNFZZRR7YXUMT25KAH5ECH2ZDA","short_pith_number":"pith:LNFZZRR7","canonical_record":{"source":{"id":"2605.18414","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-05-18T13:52:24Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"7136df09a2ee53b6965578d26e00a2fae83013260b62b9c4fc98aa10c959c6ff","abstract_canon_sha256":"91ad68f2a6285654708237f2c0319961dd6af02b3492b9bc1df59f5427980d17"},"schema_version":"1.0"},"canonical_sha256":"5b4b9cc63fc5e8c9ebaa01fa411f59182ab77ee143f0a2143a5ec0ab29b03fed","source":{"kind":"arxiv","id":"2605.18414","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.18414","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"arxiv_version","alias_value":"2605.18414v1","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.18414","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"pith_short_12","alias_value":"LNFZZRR7YXUM","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"pith_short_16","alias_value":"LNFZZRR7YXUMT25K","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"pith_short_8","alias_value":"LNFZZRR7","created_at":"2026-05-20T00:05:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:LNFZZRR7YXUMT25KAH5ECH2ZDA","target":"record","payload":{"canonical_record":{"source":{"id":"2605.18414","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-05-18T13:52:24Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"7136df09a2ee53b6965578d26e00a2fae83013260b62b9c4fc98aa10c959c6ff","abstract_canon_sha256":"91ad68f2a6285654708237f2c0319961dd6af02b3492b9bc1df59f5427980d17"},"schema_version":"1.0"},"canonical_sha256":"5b4b9cc63fc5e8c9ebaa01fa411f59182ab77ee143f0a2143a5ec0ab29b03fed","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T00:05:59.547652Z","signature_b64":"jj7bzdp5zyVYmWJVueuOH7dTRzgorEwN/Lqum4EKLBQKiFcEK1zZaTGUZxY5LXik5J4JChwvCyA8uHLVlqDPAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5b4b9cc63fc5e8c9ebaa01fa411f59182ab77ee143f0a2143a5ec0ab29b03fed","last_reissued_at":"2026-05-20T00:05:59.547045Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T00:05:59.547045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.18414","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-20T00:05:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tkAvjQ0a3LoG8EAS16ym0Q4ZB5HCK50r8TFEIqfLdW6BIJDXIYVLBQ4ffwPQvkWN6zBcEn5W5egFWzPlxpFvBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T14:15:22.327199Z"},"content_sha256":"18f9c8b9372ba0b32fdf2d2d652114aac945f5e7519557931ba3c396bd602aa4","schema_version":"1.0","event_id":"sha256:18f9c8b9372ba0b32fdf2d2d652114aac945f5e7519557931ba3c396bd602aa4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:LNFZZRR7YXUMT25KAH5ECH2ZDA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Prompts Don't Protect: Architectural Enforcement via MCP Proxy for LLM Tool Access Control","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.CR","authors_text":"Rohith Uppala","submitted_at":"2026-05-18T13:52:24Z","abstract_excerpt":"Large language models increasingly operate as autonomous agents that select and invoke tools from large registries. We identify a critical gap: when unauthorized tools are visible in an agent's context, models select them in adversarial scenarios -- even when explicitly instructed otherwise. We propose a governed MCP proxy that enforces attribute-based access control (ABAC) at two points: tool discovery, where unauthorized tools are removed from the model's context window, and tool invocation, where a second check blocks any unauthorized call. Across three models (Qwen 2.5 7B, Llama 3.1 8B, Cl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.18414","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.18414/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"cited_work_retraction","ran_at":"2026-05-19T23:51:57.852807Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"citation_quote_validity","ran_at":"2026-05-19T23:49:57.543775Z","status":"skipped","version":"0.1.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T23:33:27.598761Z","status":"skipped","version":"1.0.0","findings_count":0},{"name":"external_links","ran_at":"2026-05-19T23:31:36.232130Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T23:21:58.696101Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"5298acdd99d3fadc8b3e198403ce5ffabc852dd2da5be8beef1f4ab59e959534"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-20T00:05:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wEQjWEaNA531ALUNh4dZe54YX/gz1CMy9EHP7fBnMH6mkFOyPyPxPpwQWY0pPghTxyD17Y89Xu9vGRjoe3LfCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T14:15:22.328038Z"},"content_sha256":"2410556d7d1642e8eacc0e089ecce119d33d03f6de2e0cd623a28c7173e4765c","schema_version":"1.0","event_id":"sha256:2410556d7d1642e8eacc0e089ecce119d33d03f6de2e0cd623a28c7173e4765c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LNFZZRR7YXUMT25KAH5ECH2ZDA/bundle.json","state_url":"https://pith.science/pith/LNFZZRR7YXUMT25KAH5ECH2ZDA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LNFZZRR7YXUMT25KAH5ECH2ZDA/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-30T14:15:22Z","links":{"resolver":"https://pith.science/pith/LNFZZRR7YXUMT25KAH5ECH2ZDA","bundle":"https://pith.science/pith/LNFZZRR7YXUMT25KAH5ECH2ZDA/bundle.json","state":"https://pith.science/pith/LNFZZRR7YXUMT25KAH5ECH2ZDA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LNFZZRR7YXUMT25KAH5ECH2ZDA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:LNFZZRR7YXUMT25KAH5ECH2ZDA","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"91ad68f2a6285654708237f2c0319961dd6af02b3492b9bc1df59f5427980d17","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-05-18T13:52:24Z","title_canon_sha256":"7136df09a2ee53b6965578d26e00a2fae83013260b62b9c4fc98aa10c959c6ff"},"schema_version":"1.0","source":{"id":"2605.18414","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.18414","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"arxiv_version","alias_value":"2605.18414v1","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.18414","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"pith_short_12","alias_value":"LNFZZRR7YXUM","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"pith_short_16","alias_value":"LNFZZRR7YXUMT25K","created_at":"2026-05-20T00:05:59Z"},{"alias_kind":"pith_short_8","alias_value":"LNFZZRR7","created_at":"2026-05-20T00:05:59Z"}],"graph_snapshots":[{"event_id":"sha256:2410556d7d1642e8eacc0e089ecce119d33d03f6de2e0cd623a28c7173e4765c","target":"graph","created_at":"2026-05-20T00:05:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[{"findings_count":0,"name":"cited_work_retraction","ran_at":"2026-05-19T23:51:57.852807Z","status":"completed","version":"1.0.0"},{"findings_count":0,"name":"citation_quote_validity","ran_at":"2026-05-19T23:49:57.543775Z","status":"skipped","version":"0.1.0"},{"findings_count":0,"name":"ai_meta_artifact","ran_at":"2026-05-19T23:33:27.598761Z","status":"skipped","version":"1.0.0"},{"findings_count":0,"name":"external_links","ran_at":"2026-05-19T23:31:36.232130Z","status":"completed","version":"1.0.0"},{"findings_count":0,"name":"claim_evidence","ran_at":"2026-05-19T23:21:58.696101Z","status":"completed","version":"1.0.0"}],"endpoint":"/pith/2605.18414/integrity.json","findings":[],"snapshot_sha256":"5298acdd99d3fadc8b3e198403ce5ffabc852dd2da5be8beef1f4ab59e959534","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Large language models increasingly operate as autonomous agents that select and invoke tools from large registries. We identify a critical gap: when unauthorized tools are visible in an agent's context, models select them in adversarial scenarios -- even when explicitly instructed otherwise. We propose a governed MCP proxy that enforces attribute-based access control (ABAC) at two points: tool discovery, where unauthorized tools are removed from the model's context window, and tool invocation, where a second check blocks any unauthorized call. Across three models (Qwen 2.5 7B, Llama 3.1 8B, Cl","authors_text":"Rohith Uppala","cross_cats":["cs.AI"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-05-18T13:52:24Z","title":"Prompts Don't Protect: Architectural Enforcement via MCP Proxy for LLM Tool Access Control"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.18414","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:18f9c8b9372ba0b32fdf2d2d652114aac945f5e7519557931ba3c396bd602aa4","target":"record","created_at":"2026-05-20T00:05:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"91ad68f2a6285654708237f2c0319961dd6af02b3492b9bc1df59f5427980d17","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CR","submitted_at":"2026-05-18T13:52:24Z","title_canon_sha256":"7136df09a2ee53b6965578d26e00a2fae83013260b62b9c4fc98aa10c959c6ff"},"schema_version":"1.0","source":{"id":"2605.18414","kind":"arxiv","version":1}},"canonical_sha256":"5b4b9cc63fc5e8c9ebaa01fa411f59182ab77ee143f0a2143a5ec0ab29b03fed","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5b4b9cc63fc5e8c9ebaa01fa411f59182ab77ee143f0a2143a5ec0ab29b03fed","first_computed_at":"2026-05-20T00:05:59.547045Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T00:05:59.547045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jj7bzdp5zyVYmWJVueuOH7dTRzgorEwN/Lqum4EKLBQKiFcEK1zZaTGUZxY5LXik5J4JChwvCyA8uHLVlqDPAQ==","signature_status":"signed_v1","signed_at":"2026-05-20T00:05:59.547652Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.18414","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:18f9c8b9372ba0b32fdf2d2d652114aac945f5e7519557931ba3c396bd602aa4","sha256:2410556d7d1642e8eacc0e089ecce119d33d03f6de2e0cd623a28c7173e4765c"],"state_sha256":"bc876104fe9f022e397532bbca4bd89d5f6b6978d869b5210be269ff9dce7555"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+8WZFh1uPrrMFfNDh8cSgWdww5Vbzrb1GIS7NYEo7/js3BZ3OptCp3Y2Jlu3Xa5rDmZXFfwhhb7qNu1nbFvjCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T14:15:22.331783Z","bundle_sha256":"29848e7a1f72dd4fc3cab2563417261dc183d10f2d68a9dfa48dbbb112419ca3"}}