Serena MCP
Hacker ApprovedRanked 4 of 21 MCP servers by recommenders
Free open-source MCP server giving coding agents symbol-level search and editing, with less token churn and fewer loops.
Free open-source MCP server giving coding agents symbol-level search and editing, with less token churn and fewer loops.
21 people gave an opinion
- recommend it
- 18
- criticize it
- 3
- approval share
- 86%
Recommended in 9 of 13 months
- November 2025: not recommended
- December 2025: recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: recommended
- April 2026: recommended
- May 2026: recommended
- June 2026: not recommended
- July 2026: recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: not recommended
- November 2026: not recommended (month in progress)
Why it carries the badge
- 18 people recommend itNeeds 10 or more, met.
- 6 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 9 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Symbol-level search and editing
“it can use code-centred tools like find_symbol, find_referencing_symbols and insert_after_symbol.”
Comment from 13 Feb 2026 in “Improving 15 LLMs at Coding in One Afternoon. Only the Harness Changed” “Best methods I’ve observed -progressive loading (claude skills) & symbolic search (serena mcp)”
Comment from 15 Jan 2026 in “Ask HN: What is best way to provide continuous context to models?” “Serena is great for semantic code editing and symbol-level retrieval on your own codebase.”
Comment from 8 Dec 2025 in “Launch HN: Nia (YC S25) – Give better context to coding agents” - Comment from 6 Apr 2026 in “Ask HN: SoTA of Context Building Methods”
- Comment from 2 Mar 2026 in “MCP is dead. Long live the CLI”
Less token use
“Serena is free & open-source, and it already robustly addresses the key issues preventing coding agents from being truly efficient”
Comment from 23 Feb 2026 in “Improving 15 LLMs at Coding in One Afternoon. Only the Harness Changed” “Both semantic search as well as editing. And with way less token churn.”
Comment from 13 Feb 2026 in “Improving 15 LLMs at Coding in One Afternoon. Only the Harness Changed” “CC with Serena uses tokens fairly well.”
Comment from 24 May 2026 in “DeepSeek reasonix, engineered for low token cost during long running sessions” Helps agents avoid loops
“that plus serena mcp to replace all of gemini cli's agent tools actually gets it to work pretty well”
Comment from 21 Jan 2026 in “Ask HN: Do you have any evidence that agentic coding works?” “give it serena and it mostly works, and is less likely to hit a death loop.”
Comment from 23 Apr 2026 in “Our eighth generation TPUs: two chips for the agentic era” “Serena has been doing a not bad job of helping solve this issue”
Comment from 22 Dec 2025 in “Claude Code gets native LSP support” - Comment from 3 Feb 2026 in “Claude Code is suddenly everywhere inside Microsoft”
- Comment from 27 Dec 2025 in “Claude Code gets native LSP support”
Works with many language servers
“I use serena as an MCP for all LSPs and it works great.”
Comment from 4 Sep 2026 in “Grep beats LSP? Why coding agents ignore your fancier tools” “It opens up more features than the standard IDEA MCP.”
Comment from 10 Aug 2026 in “OpenChamber: An Agentic Development Environment”
Other MCP servers people recommend
The four most recommended other MCP servers, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Playwright MCP | 40 | 22 | 65% | 11 | — | — |
| Context7 | 40 | 7 | 85% | 10 | — | Approved |
| Chrome DevTools MCP | 36 | 22 | 62% | 9 | — | — |
| Serena MCPThis page | 18 | 3 | 86% | 9 | — | Approved |
| Context Mode | 16 | 1 | 94% | 6 | — | Approved |
What people said
22 of the 25 comments that mention it, newest first. Each links to the original comment.
“I use serena as an MCP for all LSPs and it works great.”
“Serena MCP (for the indexing part)”
“It opens up more features than the standard IDEA MCP.”
“except for Semble and Serena”
“require some arcane instructions to coerce Claude Code into compliance”
“CC with Serena uses tokens fairly well.”
“didn't like how much it does by default”
“give it serena and it mostly works, and is less likely to hit a death loop.”
“Serena gives you symbol-level navigation, reading, and editing via tree-sitter.”
“Serena in particular feels like a secret weapon sometimes.”
“Serena eats context for lunch (and dinner).”
“I had great results using this for the past few months”
“the symbolic tools are very efficient and helps the agents a lot”
“Serena is free & open-source, and it already robustly addresses the key issues preventing coding agents from being truly efficient”
“it can use code-centred tools like find_symbol, find_referencing_symbols and insert_after_symbol.”
“Both semantic search as well as editing. And with way less token churn.”
“it can cook with serena mcp”
“that plus serena mcp to replace all of gemini cli's agent tools actually gets it to work pretty well”
“Best methods I’ve observed -progressive loading (claude skills) & symbolic search (serena mcp)”
“solving exactly this issue”
“Serena has been doing a not bad job of helping solve this issue”
“Serena is great for semantic code editing and symbol-level retrieval on your own codebase.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.