{"id":"edit-anchor-check","title":"Check that an edit's old-string occurs exactly once in a file, with match contexts","description":"Counts how many times an old-string occurs in a supplied file text (as a replace-in-file tool would see it) and returns each match's offset, line, column and surrounding lines, for an agent about to issue an edit. pass: exactly one literal match, even counting overlapping ones. unknown: several matches, or one match that overlaps another occurrence of the same text (ambiguous; contexts show how to extend the string). fail: no literal match; the response then reports whitespace-tolerant line matches and typographic-quote or dash folding matches so the agent can see why. Does not apply the edit (use patch-anchor) and never edits anything.","roi":"Catches a failed or ambiguous edit before spending a tool round trip on it.","audience":"agent-infra","package":"execution-safety-kit","channels":["x402","mcp"],"endpoint":{"method":"POST","url":"https://agents.writerslogic.com/api/v1/edit-anchor-check","path":"/api/v1/edit-anchor-check","contentType":"application/json"},"price":{"amount":"0.005","currency":"USDC","network":"base","perCall":true,"failedCallsCharged":false},"inputSchema":{"type":"object","additionalProperties":false,"required":["file","oldString"],"properties":{"file":{"type":"string","maxLength":524288,"description":"File text, at most 524288 UTF-8 bytes and 100000 lines."},"oldString":{"type":"string","minLength":1,"maxLength":65536},"contextLines":{"type":"integer","minimum":0,"maximum":10,"description":"Lines of context before and after each listed match. Default 2."}}},"resultSchema":{"type":"object","properties":{"status":{"type":"string","enum":["pass","fail","unknown","unsupported"],"description":"pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass."},"exactCount":{"type":"integer","description":"Non-overlapping literal occurrences."},"overlappingCount":{"type":"integer","description":"Occurrences counting overlaps; differs from exactCount for self-overlapping strings."},"matches":{"type":"array","description":"First 10 literal matches.","items":{"type":"object","properties":{"offset":{"type":"integer","description":"UTF-16 code-unit offset."},"line":{"type":"integer","description":"1-based."},"column":{"type":"integer","description":"1-based, UTF-16 units."},"before":{"type":"array","items":{"type":"string"}},"after":{"type":"array","items":{"type":"string"}}}}},"tolerant":{"type":"object","description":"Only when there is no literal match: whole-line matches under the first tolerance rung that has any.","properties":{"tolerance":{"type":"string"},"startLines":{"type":"array","items":{"type":"integer"}},"eolMismatch":{"type":"boolean","description":"The lines match exactly; only CRLF vs LF in the search text differs."}}},"foldedCount":{"type":"integer","description":"Only when there is no literal match: occurrences after folding curly quotes, en/em dashes and NBSP to ASCII."},"witnesses":{"type":"array","items":{"type":"object","properties":{"ruleId":{"type":"string"},"detail":{"type":"string"},"path":{"type":"string","description":"JSON pointer or dotted path into the input."},"offset":{"type":"integer"},"index":{"type":"integer"},"expected":{"description":"What the rule required."},"actual":{"description":"What the input had."}}}},"versions":{"type":"object","description":"Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile)."},"limits":{"type":"array","items":{"type":"string"}},"deterministic":{"type":"boolean","description":"Always true: pure code, no model."}}},"outputSchema":{"type":"object","properties":{"data":{"type":"object","properties":{"status":{"type":"string","enum":["pass","fail","unknown","unsupported"],"description":"pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass."},"exactCount":{"type":"integer","description":"Non-overlapping literal occurrences."},"overlappingCount":{"type":"integer","description":"Occurrences counting overlaps; differs from exactCount for self-overlapping strings."},"matches":{"type":"array","description":"First 10 literal matches.","items":{"type":"object","properties":{"offset":{"type":"integer","description":"UTF-16 code-unit offset."},"line":{"type":"integer","description":"1-based."},"column":{"type":"integer","description":"1-based, UTF-16 units."},"before":{"type":"array","items":{"type":"string"}},"after":{"type":"array","items":{"type":"string"}}}}},"tolerant":{"type":"object","description":"Only when there is no literal match: whole-line matches under the first tolerance rung that has any.","properties":{"tolerance":{"type":"string"},"startLines":{"type":"array","items":{"type":"integer"}},"eolMismatch":{"type":"boolean","description":"The lines match exactly; only CRLF vs LF in the search text differs."}}},"foldedCount":{"type":"integer","description":"Only when there is no literal match: occurrences after folding curly quotes, en/em dashes and NBSP to ASCII."},"witnesses":{"type":"array","items":{"type":"object","properties":{"ruleId":{"type":"string"},"detail":{"type":"string"},"path":{"type":"string","description":"JSON pointer or dotted path into the input."},"offset":{"type":"integer"},"index":{"type":"integer"},"expected":{"description":"What the rule required."},"actual":{"description":"What the input had."}}}},"versions":{"type":"object","description":"Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile)."},"limits":{"type":"array","items":{"type":"string"}},"deterministic":{"type":"boolean","description":"Always true: pure code, no model."}}},"_provenance":{"type":"object","description":"C2PA-aligned manifest and W3C VC 2.0 (eddsa-jcs-2022) issued by the hub DID; verify at POST /api/v1/verify-provenance"}},"required":["data","_provenance"]},"example":{"file":"const a = 1;\nconst b = 2;\nconst a = 1;\n","oldString":"const b = 2;"},"openapiOperation":{"operationId":"edit_anchor_check","summary":"Check that an edit's old-string occurs exactly once in a file, with match contexts","description":"Counts how many times an old-string occurs in a supplied file text (as a replace-in-file tool would see it) and returns each match's offset, line, column and surrounding lines, for an agent about to issue an edit. pass: exactly one literal match, even counting overlapping ones. unknown: several matches, or one match that overlaps another occurrence of the same text (ambiguous; contexts show how to extend the string). fail: no literal match; the response then reports whitespace-tolerant line matches and typographic-quote or dash folding matches so the agent can see why. Does not apply the edit (use patch-anchor) and never edits anything.\n\nPrice: 0.005 USDC on Base (x402).","x-x402-price-usdc":"0.005","x-x402-amount":"5000","x-payment-info":{"protocols":["x402"],"price":{"mode":"fixed","currency":"USD","amount":"0.005"}},"x-audience":"agent-infra","x-sample-url":"https://agents.writerslogic.com/api/v1/samples/edit-anchor-check","security":[{"x402":[]},{"apiKey":[]}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","additionalProperties":false,"required":["file","oldString"],"properties":{"file":{"type":"string","maxLength":524288,"description":"File text, at most 524288 UTF-8 bytes and 100000 lines."},"oldString":{"type":"string","minLength":1,"maxLength":65536},"contextLines":{"type":"integer","minimum":0,"maximum":10,"description":"Lines of context before and after each listed match. Default 2."}}},"example":{"file":"const a = 1;\nconst b = 2;\nconst a = 1;\n","oldString":"const b = 2;"}}}},"responses":{"200":{"description":"Paid result with provenance","content":{"application/json":{"schema":{"type":"object","properties":{"data":{"type":"object","properties":{"status":{"type":"string","enum":["pass","fail","unknown","unsupported"],"description":"pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass."},"exactCount":{"type":"integer","description":"Non-overlapping literal occurrences."},"overlappingCount":{"type":"integer","description":"Occurrences counting overlaps; differs from exactCount for self-overlapping strings."},"matches":{"type":"array","description":"First 10 literal matches.","items":{"type":"object","properties":{"offset":{"type":"integer","description":"UTF-16 code-unit offset."},"line":{"type":"integer","description":"1-based."},"column":{"type":"integer","description":"1-based, UTF-16 units."},"before":{"type":"array","items":{"type":"string"}},"after":{"type":"array","items":{"type":"string"}}}}},"tolerant":{"type":"object","description":"Only when there is no literal match: whole-line matches under the first tolerance rung that has any.","properties":{"tolerance":{"type":"string"},"startLines":{"type":"array","items":{"type":"integer"}},"eolMismatch":{"type":"boolean","description":"The lines match exactly; only CRLF vs LF in the search text differs."}}},"foldedCount":{"type":"integer","description":"Only when there is no literal match: occurrences after folding curly quotes, en/em dashes and NBSP to ASCII."},"witnesses":{"type":"array","items":{"type":"object","properties":{"ruleId":{"type":"string"},"detail":{"type":"string"},"path":{"type":"string","description":"JSON pointer or dotted path into the input."},"offset":{"type":"integer"},"index":{"type":"integer"},"expected":{"description":"What the rule required."},"actual":{"description":"What the input had."}}}},"versions":{"type":"object","description":"Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile)."},"limits":{"type":"array","items":{"type":"string"}},"deterministic":{"type":"boolean","description":"Always true: pure code, no model."}}},"_provenance":{"type":"object","description":"C2PA-aligned manifest and W3C VC 2.0 (eddsa-jcs-2022) issued by the hub DID; verify at POST /api/v1/verify-provenance"}},"required":["data","_provenance"]}}}},"400":{"description":"Invalid request (no payment consumed)","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"string"},"code":{"type":"string"}}}}}},"401":{"description":"Invalid X-API-KEY","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"string"},"code":{"type":"string"}}}}}},"402":{"description":"Payment required or invalid","content":{"application/json":{"schema":{"type":"object","description":"x402 v2 PaymentRequired (also base64 in the PAYMENT-REQUIRED header)","properties":{"x402Version":{"type":"integer"},"error":{"type":"string"},"code":{"type":"string"},"resource":{"type":"object"},"accepts":{"type":"array","items":{"type":"object"}},"extensions":{"type":"object"}}}}}},"502":{"description":"Upstream failure; the payment is released or not settled","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"string"},"code":{"type":"string"}}}}}}}},"links":{"docs":"https://agents.writerslogic.com/docs/edit-anchor-check/","docsJson":"https://agents.writerslogic.com/docs/edit-anchor-check.json","sample":"https://agents.writerslogic.com/api/v1/samples/edit-anchor-check","openapi":"https://agents.writerslogic.com/openapi.json","catalog":"https://agents.writerslogic.com/api/v1/catalog","verifyProvenance":"https://agents.writerslogic.com/api/v1/verify-provenance","index":"https://agents.writerslogic.com/docs/index.json"}}