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AgentTools Text Diff (LCS Unified Diff)
x402
AgentTools Text Diff (LCS Unified Diff) is a paid API for AI agents from agenttools-hub.vercel.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Compares two texts line by line using LCS (Longest Common Subsequence) and returns a unified-diff showing exact additions, removals, and context lines.
Price / call$0.002
Success—
StatusUnknown
How this service works
Compare two texts line by line using an LCS diff: exact additions, removals and context — in unified-diff style. Deterministic, unlike asking a model to 'find the differences'. Use this when an agent needs to exact line-level diff with unified-style output.
Output
A unified-diff formatted string (or structured object) showing hunk headers, lines prefixed with '+' for additions, '-' for removals, and ' ' for unchanged context lines, exactly as produced by a standard LCS diff algorithm.
Example use cases
Code review change detection
“I have two versions of a Python function and I need to see exactly which lines changed. Original: 'def foo():\n return 1\n # old comment' and new: 'def foo():\n return 2\n # updated comment\n pass' — show me the unified diff with 1 line of context.”
Config file audit
“Compare these two config files line by line and show me every addition and removal: original is 'host=localhost\nport=8080\ndebug=true' and the new one is 'host=production.example.com\nport=443\ntimeout=30' — I want the full unified diff.”
Document revision tracking
“I edited a paragraph and want to see exactly what I changed — here's the before: 'The cat sat on the mat.\nIt was a sunny day.' and the after: 'The cat sat on the rug.\nIt was a cloudy afternoon.\nBirds were singing.' Give me the line-by-line diff with 0 context lines.”
Technical details
Endpoint
GEThttps://agenttools-hub.vercel.app/api/v1/dev/diff?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, exact line-level diff output in unified-diff format rather than asking an LLM to describe differences (which is non-deterministic and prone to hallucination). Ideal for code comparison, config audits, document versioning, or any scenario where precision matters and you need a machine-readable diff.
Side effects
- Missing required query parameters 'a' or 'b' returns a 400 error
- Extremely long texts may hit size limits or timeout
- Non-string inputs may cause parameter parsing errors
- Payment failure (x402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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