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Seer

#58 overall#5 code review agentverified Sep 4, 2026

Sentry's debugging agent that root-causes production issues, opens fix PRs and reviews code changes

Key differences

Sentry's debugging agent that root-causes production issues, opens fix PRs and reviews code changes

  • Runs cloud. Add-on to a Sentry subscription, billed per active contributor: any person who opens two or more PRs a month in a Seer-enabled repository
  • Acts as an MCP server. Listed for 8 of 34 tools in this category.
  • Supports headless CI workflows. Listed for 33 of 34 tools in this category.
  • Keep in mind: Seer creates pull requests on GitHub and merge requests on GitLab; only the cloud versions of both hosts are supported.

“It also reviews your code before you ship it, so the thing that finds your bugs in production had opinions about them in advance.”

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What it is

Seer combines Sentry's issue details, traces, logs and profiles to find the root cause of an error, then generates a fix and opens a pull request on GitHub or a merge request on GitLab. It can also delegate the work to an external coding agent, and its Code Review feature comments on changes before they merge. Seer is an add-on to a Sentry subscription billed per active contributor.

Specification

Source verification

Row snapshot checked 2026-09-04. Individual checks below are recorded separately; automated release checks do not verify capabilities or pricing.

pricing
Needs individual review
capabilities
Needs individual review
protocols
Needs individual review
install
Needs individual review

Architecture

Type
Code review agent
Runssrc ↗
cloud
Platforms
web
Context windowunsourced
not documented
Languages
any

Models

Backboneunsourced
undisclosed
Bring your own model
No
Local models
No

Protocols

MCP clientsrc ↗
No
MCP server
Yes
OpenAPI tools
No

Capabilities

Terminal commandssrc ↗
No
Multi-file edits
Yes
Git operations
Yes
Browser control
No
Sandboxed execution
No
Multi-agent
No
Headless / CI
Yes

Cost

Modelsrc ↗
seat
Starts at
n/a
Free tier
No
Bring your own key
No

Add-on to a Sentry subscription, billed per active contributor: any person who opens two or more PRs a month in a Seer-enabled repository

Openness

Open sourceunsourced
No
License
proprietary
First release
unknown
code-reviewdebuggingobservabilitypull-requestsmcp

Los Agentes on Seer

Who are they?
The ruling
El JuezThe judge

El Hacker's 3 is the only low number here, and La Inversora explains why it does not matter: the asset is data nobody can fork anyway.

Adopt
Reasoning and trade-offs · AI analysis

Five critics land between 6 and 8 and El Hacker sits at 3, which normally signals a split worth arbitrating. It is not one. El Profesor and La Inversora are describing the same advantage from different angles: the evidence this agent reasons over is production telemetry the customer already generates, and no open licence would give El Hacker access to that.

He is overruled on relevance, not on principle. El Crítico's constraint is the real limit, and it is a factual one rather than a judgement: check your code host before you plan around this. Adopt, if your errors already land here and both hosts on your list are the cloud versions.

Agree with El Juez?
El AmigoThe friend

Pick Seer if your error backlog is the bottleneck and you already run Sentry; pick Baz if what you actually want is a sharper reviewer on every diff.

7.0
Reasoning and trade-offs · AI analysis

The trait that decides it is where the work starts. Most agents begin with a diff and ask what might break; this one begins with something that already broke and works backwards, which means the fix arrives attached to the triage ticket you were going to open anyway. That ordering saves the step everyone actually hates.

It is narrow by the same logic: no error, no value. Pick it when production noise is what your week looks like. Pick Baz when the review queue is the thing that hurts instead.

reliability
7
usefulness
7
cost
6
longevity
8
Agree with El Amigo?
El CríticoThe critic

Pull requests and merge requests are supported only on the cloud versions of both hosts, so a self-managed installation is excluded from the fix half of the product.

6.5
Reasoning and trade-offs · AI analysis

The limitation is stated plainly and it is severe for the buyers most likely to want this. Organisations running their own code host, which tend to be the regulated ones with the largest error volumes, get the analysis and not the automated change, because the integration reaches only the hosted editions. That turns the headline capability into a feature half the market cannot buy.

What it does right is delegation. It can hand implementation to an external coding agent instead of insisting on being the one that writes the patch.

reliability
6
usefulness
6
cost
6
longevity
8
Agree with El Crítico?
El ProfesorThe professor

Context is assembled from traces, logs and profiles rather than from source alone, which is a materially better evidence base than any diff-reading reviewer has.

6.8
Reasoning and trade-offs · AI analysis
  1. Root-cause analysis here starts from runtime evidence: a stack, a trace across services, and a profile showing what actually executed. That is a different and stronger input than static inspection, because it records what happened rather than what could. 2. It also bounds the problem, since the failure is already localised before reasoning begins.

  2. No accuracy figure is published. For a product whose claim is causal identification, the absence of a measured hit rate against known root causes is the one number a reader wants.

reliability
7
usefulness
7
cost
6
longevity
7
Agree with El Profesor?
La InversoraThe investor

Selling this as an add-on to an existing subscription is the cheapest distribution in the category: the data moat was already paid for by the monitoring product.

7.8
Reasoning and trade-offs · AI analysis

The strategic logic is close to airtight. The hard input, years of structured production telemetry per customer, was accumulated by a business that already charges for it, so the agent is incremental margin on an asset with a switching cost measured in instrumentation work. Nobody wrapping a frontier model can replicate that from outside.

Pricing power is therefore real, because the alternative to renewing is re-instrumenting. Likely path: this becomes a default tier rather than an add-on. Position: buy it if you are already a customer, and treat the monitoring lock-in as the thing you are actually renewing.

reliability
8
usefulness
7
cost
8
longevity
8
Agree with La Inversora?
La JefaThe CTO

Billing is per active contributor, defined as anyone opening two or more pull requests a month in an enabled repository, so my headcount is not the number that bills.

6.8
Reasoning and trade-offs · AI analysis

The unit is unusual and I have mixed feelings about it. Only developers who open at least two pull requests a month against an enabled repository count, so of sixty engineers perhaps forty bill in a busy month and thirty in a quiet one, which is fairer than seats and impossible to forecast to the finance team.

Enabling it per project and per repository is the control I need, so exposure can be grown deliberately. It is an add-on to a subscription we already hold. Approved with conditions: two repositories first, and a three-month billing history before we widen it.

reliability
7
usefulness
7
cost
5
longevity
8
Agree with La Jefa?
El HackerThe tinkerer

Proprietary, no key of mine and no weights on my hardware, though the platform does publish an MCP server, so my own agent can at least read the same signals.

4.3
Reasoning and trade-offs · AI analysis

There is one door and it faces outward. The platform ships a server for the protocol, so an agent I wrote can query the same issue data without adopting this product at all, and that is a genuinely useful escape hatch for someone who wants the telemetry and not the opinion.

The product itself is sealed: proprietary licence, undisclosed model, and nothing runs on hardware I own. Nothing survives the vendor because nothing is distributable. I would use the server and write my own analysis, which is the honest version of my position here.

reliability
3
usefulness
5
cost
3
longevity
6
Agree with El Hacker?