[Bug] Anthropic API Error: Internal Server Error (HTTP 500)
Resolved 💬 3 comments Opened Feb 18, 2026 by Rabusek Closed Feb 22, 2026
Bug Description
suddenly got an error 500
Environment Info
- Platform: darwin
- Terminal: ghostty
- Version: 2.1.44
- Feedback ID: 1a92d7d5-5760-4dd0-a54a-0520c7f6056e
Errors
[{"error":"Error: ensureToolResultPairing: repaired missing tool_result blocks (521 -> 538 messages). Message structure: [0] user; [1] assistant(id=msg_0142wJh11YWSaPCmhK3GQYtc, tool_uses=[toolu_01MrDnRYWKySctxn9qhNPsCi]); [2] user(tool_results=[toolu_01MrDnRYWKySctxn9qhNPsCi]); [3] assistant(id=msg_012v7BQF69szrAgL5uqM25eV, tool_uses=[toolu_015Ss2jk2esVgnQ1nG9jXyXW]); [4] user(tool_results=[toolu_015Ss2jk2esVgnQ1nG9jXyXW]); [5] assistant(id=msg_01BKQ2fFsuZK1wzUAvJf31iq, tool_uses=[toolu_01QrMbhy3WwZpguMCpRFFqtp]); [6] user(tool_results=[toolu_01QrMbhy3WwZpguMCpRFFqtp]); [7] assistant(id=msg_01AhWxwG5mViUQaMthN4n56E, tool_uses=[toolu_01MLGgdFhX4LapkEJGEv5kMz]); [8] user(tool_results=[toolu_01MLGgdFhX4LapkEJGEv5kMz]); [9] assistant(id=msg_01ADeP6wsYY6mctuDUF3aLpi, tool_uses=[toolu_015RSZt28g8FM38vQrGPLah1]); [10] user(tool_results=[toolu_015RSZt28g8FM38vQrGPLah1]); [11] assistant(id=msg_01LzUKSVNic8QxBsREHHWdFo, tool_uses=[toolu_01Js92RBw6meci35sWhYmRv1]); [12] user(tool_results=[toolu_01Js92RBw6meci35sWhYmRv1]); [13] assistant(id=msg_01N8Q6BAK2iAJHmVd12N15jV, tool_uses=[toolu_01EGHB42PAQgq8U9q9jvyVzG]); [14] user(tool_results=[toolu_01EGHB42PAQgq8U9q9jvyVzG]); [15] assistant(id=msg_01B9FMyVy1yzhUiVT5CKg4Qr, tool_uses=[toolu_01YPDhUwPrfVfLGUzJpBtNTk]); [16] user(tool_results=[toolu_01YPDhUwPrfVfLGUzJpBtNTk]); [17] assistant(id=msg_01AVf7gd3hoTvPpdUKKdwXV3, tool_uses=[toolu_01JL8zQzwRDtNGzo8dKaoEQZ]); [18] user(tool_results=[toolu_01JL8zQzwRDtNGzo8dKaoEQZ]); [19] assistant(id=msg_01Y5etUgLzpByDYLYPo6qCgs, tool_uses=[toolu_01Ahzae7UmH9dMeW79XNemAy]); [20] user(tool_results=[toolu_01Ahzae7UmH9dMeW79XNemAy]); [21] assistant(id=msg_01TBfk791XajKZJWY8xcjq6p, tool_uses=[toolu_013134jyGs8EkV518pWweAiq]); [22] user(tool_results=[toolu_013134jyGs8EkV518pWweAiq]); [23] assistant(id=msg_01KYvDSDDZ6vb1JdAPF7JwZa, tool_uses=[toolu_01YQGN8E4xAwuvS3PQv9Rzso]); [24] user(tool_results=[toolu_01YQGN8E4xAwuvS3PQv9Rzso]); [25] assistant(id=msg_0177e9gGXGYDtG8FS2CVxe98, tool_uses=[toolu_0177wkK2BZQudK4TMuSJKPj5]); [26] user(tool_results=[toolu_0177wkK2BZQudK4TMuSJKPj5]); [27] assistant(id=msg_01JJtJbjjRS2RWojYKaBHsX7, tool_uses=[toolu_01BY3bBbxNAhQSuUrFvrSxah]); [28] user(tool_results=[toolu_01BY3bBbxNAhQSuUrFvrSxah]); [29] assistant(id=msg_01EMKy4N1wgRbxDHGAcVkyD3, tool_uses=[toolu_012D2U5AxoJDnMpkx57toQYT]); [30] user(tool_results=[toolu_012D2U5AxoJDnMpkx57toQYT]); [31] assistant(id=msg_01N2rVLgDMpr3wFkt9zh5C9U, tool_uses=[toolu_015ThhmMvs5GAFhJjRw895d5]); [32] user(tool_results=[toolu_015ThhmMvs5GAFhJjRw895d5]); [33] assistant(id=msg_01W4cBzL1Tg269wMxkzxrQ7B, tool_uses=[toolu_013q42QrQTrzf2L2zG3fMhcY]); [34] user(tool_results=[toolu_013q42QrQTrzf2L2zG3fMhcY]); [35] assistant(id=msg_017TB6WS629LKwjGUM6hFmKA, tool_uses=[toolu_01QrQTaGGig88RjLWz5gxdKF]); [36] user(tool_results=[toolu_01QrQTaGGig88RjLWz5gxdKF]); [37] assistant(id=msg_01HcKwabvWZozXsKzaJkgBn4, tool_uses=[toolu_01UdntGgoGms3TrJftqDwRFB]); [38] user(tool_results=[toolu_01UdntGgoGms3TrJftqDwRFB]); [39] assistant(id=msg_01FeaLYTkyGEcpXv5VxQFMrB, tool_uses=[toolu_011fU4yh62ELQjZ8M9E6MYCk]); [40] user(tool_results=[toolu_011fU4yh62ELQjZ8M9E6MYCk]); [41] assistant(id=msg_011uohRzeAW9PTGMXCLUCn7M, tool_uses=[toolu_01M5ccG3h4DXZ2zSK8vXxbJL]); [42] user(tool_results=[toolu_01M5ccG3h4DXZ2zSK8vXxbJL]); [43] assistant(id=msg_01STCxyK8yGZ9DXHxp3o2qGo, tool_uses=[toolu_015X1c2UUH2eSTs1NNKwjwZr]); [44] user(tool_results=[toolu_015X1c2UUH2eSTs1NNKwjwZr]); [45] assistant(id=msg_01BCFLX9kmSZETMfzjCF8Mn6, tool_uses=[toolu_01JzLEYNBhwLWXjh4dUcsJk6]); [46] user(tool_results=[toolu_01JzLEYNBhwLWXjh4dUcsJk6]); [47] assistant(id=msg_01QWSNSPofUN1iiqXFf5AJAo, tool_uses=[toolu_01XSN9sXGmUgwmKccXuq4A44]); [48] user(tool_results=[toolu_01XSN9sXGmUgwmKccXuq4A44]); [49] assistant(id=msg_01V9z9ao1RYX71VYJqioZNWv, tool_uses=[toolu_01FMxrcUDopsucYQZ2AyHiiV]); [50] user(tool_results=[toolu_01FMxrcUDopsucYQZ2AyHiiV]); [51] assistant(id=msg_01LbS9ZZ3LrV4rxtGt4ptqru, tool_uses=[toolu_01SM3bB1u58EcZPyVefo68oB]); [52] user(tool_results=[toolu_01SM3bB1u58EcZPyVefo68oB]); [53] assistant(id=msg_01M1SnMXm4HVtph7vu83nDP7, tool_uses=[toolu_01QhtAFhEKe9Ro2qAWNJjzSP]); [54] user(tool_results=[toolu_01QhtAFhEKe9Ro2qAWNJjzSP]); [55] assistant(id=msg_01Uz1LiseD2nyHehqZ6Ubgvw, tool_uses=[toolu_016RbrvEUnXuHigcndGv7VGG]); [56] user(tool_results=[toolu_016RbrvEUnXuHigcndGv7VGG]); [57] assistant(id=msg_01KpGdSMPWGMZCvXcWpkmjjp, tool_uses=[toolu_01QWBPHGLW64Mn82iGAX4CST]); [58] user(tool_results=[toolu_01QWBPHGLW64Mn82iGAX4CST]); [59] assistant(id=msg_01LzGoL8xntRyX31gcMWGBih, tool_uses=[toolu_01FDZnTbWuHwQyieB366b3pD]); [60] user(tool_results=[toolu_01FDZnTbWuHwQyieB366b3pD]); [61] assistant(id=msg_016sKPkvPGSvC1VdBqAsrAsR, tool_uses=[toolu_01JWwAPvEaMaDRMFYaHUx698]); [62] user(tool_results=[toolu_01JWwAPvEaMaDRMFYaHUx698]); [63] assistant(id=msg_01P8cade1mVaLRuFxQ3BmGp8, tool_uses=[toolu_019nrnTc8XdtvUcyHj5FAeWh]); [64] user(tool_results=[toolu_019nrnTc8XdtvUcyHj5FAeWh]); [65] assistant(id=msg_01Tzh2TemjnMy7PWfSrqedHq, tool_uses=[toolu_01GB8dzCr9VyBqoGhU2Xs4pu]); [66] user(tool_results=[toolu_01GB8dzCr9VyBqoGhU2Xs4pu]); [67] assistant(id=msg_01UAY8ULdnDY9PMzb3x4bQiH, tool_uses=[toolu_01FsubtoK2FosmTtuN5iVeyB]); [68] user(tool_results=[toolu_01FsubtoK2FosmTtuN5iVeyB]); [69] assistant(id=msg_01YQttA5s4WLen5gJecvTTjL, tool_uses=[toolu_01QYpZNATf1Kp…
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