{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:4ZSKB4Q2MKMEYZMSPMKW6MRNRF","short_pith_number":"pith:4ZSKB4Q2","canonical_record":{"source":{"id":"2606.00408","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-05-29T22:51:58Z","cross_cats_sorted":["cs.AI","cs.IR"],"title_canon_sha256":"f9e2ec42d5e04584de52cf18de9e9e9b7d4c83293f05391799f65c7316f4e35d","abstract_canon_sha256":"2fa3631667491c14ff3fe76a02a153e7df1c12cdbeabe371f46eeb9a3276f968"},"schema_version":"1.0"},"canonical_sha256":"e664a0f21a62984c65927b156f322d894d9e50119df86fed21984c4cf7861773","source":{"kind":"arxiv","id":"2606.00408","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.00408","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"arxiv_version","alias_value":"2606.00408v1","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.00408","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"pith_short_12","alias_value":"4ZSKB4Q2MKME","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"pith_short_16","alias_value":"4ZSKB4Q2MKMEYZMS","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"pith_short_8","alias_value":"4ZSKB4Q2","created_at":"2026-06-02T01:03:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:4ZSKB4Q2MKMEYZMSPMKW6MRNRF","target":"record","payload":{"canonical_record":{"source":{"id":"2606.00408","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-05-29T22:51:58Z","cross_cats_sorted":["cs.AI","cs.IR"],"title_canon_sha256":"f9e2ec42d5e04584de52cf18de9e9e9b7d4c83293f05391799f65c7316f4e35d","abstract_canon_sha256":"2fa3631667491c14ff3fe76a02a153e7df1c12cdbeabe371f46eeb9a3276f968"},"schema_version":"1.0"},"canonical_sha256":"e664a0f21a62984c65927b156f322d894d9e50119df86fed21984c4cf7861773","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-02T01:03:53.830063Z","signature_b64":"Z0Im25RON7pXFf3TS1E4MSG30xRtpVhWiK4t3ij5p+8xHhJj1qAAg+kjp1uI70Tb0t1SFWLNHGtsVM7ojgRgBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e664a0f21a62984c65927b156f322d894d9e50119df86fed21984c4cf7861773","last_reissued_at":"2026-06-02T01:03:53.829658Z","signature_status":"signed_v1","first_computed_at":"2026-06-02T01:03:53.829658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.00408","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":"2026-06-02T01:03:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0KKaTUA01nuZthV7XscvsrLaiRoO0Ue9sW2BZTmdGzavYZOj1+4Xh51UczkwtuBgcVHzgDG0Xzhbk2dxnXM7Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T02:45:55.114101Z"},"content_sha256":"f9ffc818f29b0089390083f40905e38322eeed745e0c8dc234e56566f6a3a743","schema_version":"1.0","event_id":"sha256:f9ffc818f29b0089390083f40905e38322eeed745e0c8dc234e56566f6a3a743"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:4ZSKB4Q2MKMEYZMSPMKW6MRNRF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Masking Stale Observations Helps Search Agents -- Until It Doesn't: A Regime Map and Its Mechanism","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.AI","cs.IR"],"primary_cat":"cs.CL","authors_text":"Haoxiang Zhang, Julian McAuley, Lei Zhang, Pengcheng Jiang, Qixin Xu, Yu Zhang, Zhuofeng Li","submitted_at":"2026-05-29T22:51:58Z","abstract_excerpt":"Long-horizon search agents accumulate large amounts of retrieved content across many tool calls, making context-budget efficiency increasingly important. A minimal intervention is to mask stale observations from the context as the trajectory progresses, but it remains unclear when this form of context management helps and why. We study observation masking through a systematic sweep over various agent backbones (4B to 284B parameters) and three retrievers on offline and live-web agentic search benchmarks. We find that the accuracy gain from masking follows an asymmetric inverted-U shape when pl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.00408","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/2606.00408/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-06-02T01:03:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PgTySNPiVfEK7dga1zriAVsTw4+X5pTW2FGWrDKUQP8+lgrjqau+y6he0EKfWkH8/9y1oyGGmvTOe96r64aNDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T02:45:55.114925Z"},"content_sha256":"ece3abc56c2bf04dd1cfeb3ef08a5fb88a7cdd0356fa1f6df023bb3c72310bd7","schema_version":"1.0","event_id":"sha256:ece3abc56c2bf04dd1cfeb3ef08a5fb88a7cdd0356fa1f6df023bb3c72310bd7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4ZSKB4Q2MKMEYZMSPMKW6MRNRF/bundle.json","state_url":"https://pith.science/pith/4ZSKB4Q2MKMEYZMSPMKW6MRNRF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4ZSKB4Q2MKMEYZMSPMKW6MRNRF/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":"2026-06-09T02:45:55Z","links":{"resolver":"https://pith.science/pith/4ZSKB4Q2MKMEYZMSPMKW6MRNRF","bundle":"https://pith.science/pith/4ZSKB4Q2MKMEYZMSPMKW6MRNRF/bundle.json","state":"https://pith.science/pith/4ZSKB4Q2MKMEYZMSPMKW6MRNRF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4ZSKB4Q2MKMEYZMSPMKW6MRNRF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:4ZSKB4Q2MKMEYZMSPMKW6MRNRF","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":"2fa3631667491c14ff3fe76a02a153e7df1c12cdbeabe371f46eeb9a3276f968","cross_cats_sorted":["cs.AI","cs.IR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-05-29T22:51:58Z","title_canon_sha256":"f9e2ec42d5e04584de52cf18de9e9e9b7d4c83293f05391799f65c7316f4e35d"},"schema_version":"1.0","source":{"id":"2606.00408","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.00408","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"arxiv_version","alias_value":"2606.00408v1","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.00408","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"pith_short_12","alias_value":"4ZSKB4Q2MKME","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"pith_short_16","alias_value":"4ZSKB4Q2MKMEYZMS","created_at":"2026-06-02T01:03:53Z"},{"alias_kind":"pith_short_8","alias_value":"4ZSKB4Q2","created_at":"2026-06-02T01:03:53Z"}],"graph_snapshots":[{"event_id":"sha256:ece3abc56c2bf04dd1cfeb3ef08a5fb88a7cdd0356fa1f6df023bb3c72310bd7","target":"graph","created_at":"2026-06-02T01:03:53Z","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":[],"endpoint":"/pith/2606.00408/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Long-horizon search agents accumulate large amounts of retrieved content across many tool calls, making context-budget efficiency increasingly important. A minimal intervention is to mask stale observations from the context as the trajectory progresses, but it remains unclear when this form of context management helps and why. We study observation masking through a systematic sweep over various agent backbones (4B to 284B parameters) and three retrievers on offline and live-web agentic search benchmarks. We find that the accuracy gain from masking follows an asymmetric inverted-U shape when pl","authors_text":"Haoxiang Zhang, Julian McAuley, Lei Zhang, Pengcheng Jiang, Qixin Xu, Yu Zhang, Zhuofeng Li","cross_cats":["cs.AI","cs.IR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-05-29T22:51:58Z","title":"Masking Stale Observations Helps Search Agents -- Until It Doesn't: A Regime Map and Its Mechanism"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.00408","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:f9ffc818f29b0089390083f40905e38322eeed745e0c8dc234e56566f6a3a743","target":"record","created_at":"2026-06-02T01:03:53Z","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":"2fa3631667491c14ff3fe76a02a153e7df1c12cdbeabe371f46eeb9a3276f968","cross_cats_sorted":["cs.AI","cs.IR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-05-29T22:51:58Z","title_canon_sha256":"f9e2ec42d5e04584de52cf18de9e9e9b7d4c83293f05391799f65c7316f4e35d"},"schema_version":"1.0","source":{"id":"2606.00408","kind":"arxiv","version":1}},"canonical_sha256":"e664a0f21a62984c65927b156f322d894d9e50119df86fed21984c4cf7861773","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e664a0f21a62984c65927b156f322d894d9e50119df86fed21984c4cf7861773","first_computed_at":"2026-06-02T01:03:53.829658Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-02T01:03:53.829658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Z0Im25RON7pXFf3TS1E4MSG30xRtpVhWiK4t3ij5p+8xHhJj1qAAg+kjp1uI70Tb0t1SFWLNHGtsVM7ojgRgBA==","signature_status":"signed_v1","signed_at":"2026-06-02T01:03:53.830063Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.00408","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f9ffc818f29b0089390083f40905e38322eeed745e0c8dc234e56566f6a3a743","sha256:ece3abc56c2bf04dd1cfeb3ef08a5fb88a7cdd0356fa1f6df023bb3c72310bd7"],"state_sha256":"6540d7f9d5d770451038d3ee8dd64aed44aa88b7e93e6e1ccd60a2ab19c7052b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QJUPvPbsHsyNg/fwrdsfmTHQU5swdHNnWJGKkdGaFGzxKiAnmYV3MwSI1eCEZGKwtit8C0s/h6kYUzeI9IKOCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T02:45:55.118994Z","bundle_sha256":"d65b2a5015196255506090af63e4cd58ee863218a128b90f71b9a67456a1b7e9"}}